Hydrogen engine and hybrid system cooperative control method, device, equipment and medium

Abstract

The embodiment of the application provides a hydrogen engine and hybrid system cooperative control method, device, equipment and medium, the method comprises the following steps: when the start instruction is issued to the hydrogen engine, the current speed of the vehicle is obtained; if the speed is greater than the preset speed, the hydrogen engine is controlled to reverse drag, the hydrogen engine crankshaft is driven to rotate, the hydrogen engine throttle is fully opened, and the hydrogen engine supercharger waste gas bypass valve is fully opened, and the first preset time period is kept; after the first preset time period, the hydrogen engine throttle and the hydrogen engine supercharger waste gas bypass valve are restored to the default state, and the hydrogen engine executes the start instruction. The embodiment of the application can improve the emptying efficiency of residual hydrogen of the hydrogen engine.

Description

Technical Field

[0001] This application belongs to the field of vehicle control technology, and in particular relates to a method, device, equipment and medium for coordinated control of hydrogen engine and hybrid system. Background Technology

[0002] Hydrogen, as a clean fuel, can significantly reduce carbon emissions when used in spark-ignition engines in hybrid systems. However, during the actual start-stop process of a hydrogen engine, residual hydrogen will remain in the intake manifold, exhaust manifold, and cylinders. The removal of residual hydrogen is not very efficient, and because hydrogen is flammable and explosive, the residual hydrogen in the intake manifold, exhaust manifold, and cylinders during engine start-stop can easily cause an explosion risk.

[0003] Therefore, it is necessary to provide a method for coordinated control of hydrogen engines and hybrid systems to solve the problems existing in the prior art. Summary of the Invention

[0004] The embodiments of this application provide a method, apparatus, equipment, and medium for coordinated control of a hydrogen engine and a hybrid system, which is used to solve the problem of low efficiency in venting residual hydrogen during the actual start-up and shutdown process of a hydrogen engine in the prior art.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to a first aspect of the embodiments of this application, a method for coordinated control of a hydrogen engine and a hybrid system is provided, applicable to a control unit in a hybrid system, wherein the vehicle includes a hydrogen engine, and the method includes: When a start command is issued to the hydrogen engine, operations to control the hydrogen engine are performed, including: Get the vehicle's current speed; If the vehicle speed is greater than the preset speed, control the hydrogen engine to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle valve and fully open the turbocharger exhaust bypass valve, and maintain this for the first preset time period. After the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default states, and the hydrogen engine is controlled to execute the start command.

[0007] In some embodiments of this application, when a shutdown command is issued to the hydrogen engine during operation, the hydrogen engine is controlled to enter a stable operating condition and maintained for a second preset time period. The stable operating condition includes: the hydrogen engine speed is within a first range, the hydrogen engine load is within a second range, and the hydrogen engine air-fuel ratio is not greater than a safety threshold. After the second preset time period, the hydrogen engine is controlled to execute a shutdown command.

[0008] In some embodiments of this application, after the hydrogen engine executes a shutdown command, the vehicle's driving status is obtained; If the driving status is normal driving, when a start command is sent to the hydrogen engine, the hydrogen engine is controlled to execute the start command; If the vehicle is in a stalled state, the hydrogen engine control operation is executed when a start command is issued to the hydrogen engine.

[0009] In some embodiments of this application, controlling the air-fuel ratio of the hydrogen engine to be no greater than a safety threshold includes: Obtain the current air-fuel ratio of the hydrogen engine; If the air-fuel ratio is greater than the safety threshold, the excess air coefficient of the hydrogen engine is lowered by a preset threshold to obtain a new excess air coefficient, and the air-fuel ratio corresponding to the new excess air coefficient is obtained until the air-fuel ratio is not greater than the safety threshold and continues for a second preset time period.

[0010] In some embodiments of this application, obtaining the air-fuel ratio of the hydrogen engine at the current moment includes: Real-time acquisition of crankshaft speed of drive engine or vibration value of hydrogen engine; The air-fuel ratio of a hydrogen engine is determined based on its rotational speed or vibration value.

[0011] In some embodiments of this application, after a first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are controlled to return to their default states, and the hydrogen engine is controlled to execute a start command, including: After a first preset time period, the hydrogen concentration in the vehicle's exhaust manifold is obtained; If the hydrogen concentration is less than the first threshold, control the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve to return to the default state, and control the hydrogen engine to execute the start command; If the hydrogen level is not less than the first threshold, after the third preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are controlled to return to their default states, and the hydrogen engine is controlled to execute the start command.

[0012] In some embodiments of this application, the towing torque of the hydrogen engine during reverse towing is controlled to be greater than the minimum torque when the hydrogen engine starts.

[0013] According to a second aspect of the embodiments of this application, a hydrogen engine and hybrid system coordinated control device is provided, applicable to a control unit in a hybrid system, wherein the vehicle includes a hydrogen engine, and the device includes: The execution unit is configured to perform hydrogen engine control operations when a start command is issued to the hydrogen engine, the hydrogen engine control operations including: Get the vehicle's current speed; If the vehicle speed is greater than the preset speed, control the hydrogen engine to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle valve and fully open the turbocharger exhaust bypass valve, and maintain this for a first preset time period. After the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default states, and the hydrogen engine is controlled to execute the start command.

[0014] According to a third aspect of the embodiments of this application, a computer-readable storage medium is provided, storing computer program instructions, which, when loaded and executed by a processor, implement the steps of the hydrogen engine and hybrid system coordinated control method as described in any of the first aspects.

[0015] According to a fourth aspect of the embodiments of this application, an electronic device is provided, including a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, it implements the steps of the hydrogen engine and hybrid system coordinated control method as described in any of the first aspects.

[0016] According to a fifth aspect of the embodiments of this application, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the hydrogen engine and hybrid system coordinated control method as described in any of the first aspects.

[0017] In this application, when a start command is issued to the hydrogen engine, the hydrogen engine control operation is performed. This control operation includes: acquiring the vehicle's current speed; if the vehicle speed is greater than a preset speed, controlling the hydrogen engine to reverse, driving the engine crankshaft to rotate, fully opening the hydrogen engine throttle, and fully opening the turbocharger exhaust bypass valve, maintaining this for a first preset time period; after the first preset time period, controlling the hydrogen engine throttle and turbocharger exhaust bypass valve to return to their default states, and controlling the hydrogen engine to execute the start command. This application can, when the hydrogen engine is about to start, completely empty the residual hydrogen in the hydrogen engine by reversing it within the first preset time period, and by controlling the hydrogen engine throttle and turbocharger exhaust bypass valve to fully open, accelerate the emptying of residual hydrogen, improve the efficiency of residual hydrogen removal, and avoid the risk of explosion due to excessively high residual hydrogen concentration. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A flowchart illustrating a method for coordinated control of a hydrogen engine and a hybrid system according to an embodiment of this application is shown. Figure 2 A flowchart illustrating the second method for coordinated control of a hydrogen engine and a hybrid system in an embodiment of this application is shown. Figure 3 A flowchart illustrating a hydrogen engine shutdown control method according to an embodiment of this application is shown; Figure 4 A schematic diagram of a process for controlling the air-fuel ratio of a hydrogen engine to be no greater than a safety threshold is shown in an embodiment of this application; Figure 5 A schematic diagram of a process for obtaining the current air-fuel ratio of a hydrogen engine is shown in an embodiment of this application. Figure 6 A flowchart illustrating the second method for coordinated control of a hydrogen engine and a hybrid system in an embodiment of this application is shown. Figure 7 A schematic diagram of the structure of a hydrogen engine and hybrid system coordinated control device in an embodiment of this application is shown; Figure 8 A schematic diagram of the structure of an electronic device in an embodiment of this application is shown. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0021] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0022] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0023] In one exemplary embodiment, this application provides a method for coordinated control of a hydrogen engine and a hybrid system, detailed as follows: When a start command is issued to the hydrogen engine, the operation of controlling the hydrogen engine is executed.

[0024] In some embodiments, the hydrogen engine and hybrid system coordinated control method is applicable to the control unit in the hybrid system. The control unit can be a vehicle PCU (Power Control Unit), or other devices with data processing capabilities, depending on the specific circumstances.

[0025] Specifically, the operation of controlling the hydrogen engine is performed; for details, please refer to... Figure 1 The flowchart of another method for coordinated control of a hydrogen engine and a hybrid system according to an embodiment of this application is shown, and the following steps S101-S103 are described in detail: S101, obtain the vehicle's current speed.

[0026] In this application, due to the technical limitations of the hydrogen engine itself, the premise for the operation of the hydrogen engine is that the vehicle is in motion. That is, as mentioned in S101 above, when the PCU issues a start command to the hydrogen engine, it must determine whether the vehicle is in motion, so it is necessary to obtain the vehicle's current speed.

[0027] In some embodiments, the hydrogen engine uses high-purity hydrogen as fuel and employs a spark ignition system, for example, with a purity ≥ 99.97%. The purity value can be set according to actual conditions, and will not be elaborated here.

[0028] S102, if the vehicle speed is greater than the preset speed, control the hydrogen engine to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle valve and fully open the turbocharger exhaust bypass valve, and maintain this for the first preset time period.

[0029] In some embodiments, the hybrid system includes at least a generator, a power battery, and a power control unit (PCU). The generator has the function of towing the hydrogen engine backwards, wherein the towing torque when controlling the hydrogen engine to tow is greater than the minimum torque when the hydrogen engine starts. Specifically, the maximum towing torque when controlling the hydrogen engine to tow is greater than or equal to 1.2 times the minimum torque.

[0030] In this embodiment, the preset speed can be 50km / h, and the specific value can be set according to the actual situation, which will not be elaborated here.

[0031] The aforementioned crankshaft rotation speed is maintained between 300-500 rpm. Specific values ​​can be set according to actual conditions, and will not be elaborated further here.

[0032] The throttle opening of the aforementioned hydrogen engine is greater than the first preset opening, and the turbocharger exhaust bypass valve opening is greater than the second preset opening. This design creates a direct intake-exhaust passage, which is beneficial for hydrogen removal.

[0033] The first preset opening can be 98%, and the second preset opening can also be 98%. The specific values ​​can be set according to the actual situation, and will not be elaborated here.

[0034] Specifically, in actual operation, such as during the execution of S102 above, the hydrogen injection and ignition commands are not executed, and the residual hydrogen in the intake manifold and exhaust manifold is drained through air circulation within the first preset time period.

[0035] S103, after the first preset time period, controls the hydrogen engine throttle valve and the turbocharger exhaust bypass valve to return to the default state, and controls the hydrogen engine to execute the start command.

[0036] Specifically, during the first preset time period, the residual hydrogen in the intake manifold and exhaust manifold is drained through air circulation. That is, after the first preset time period, all the hydrogen in the hydrogen engine has been emptied. Therefore, after the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default state, that is, the normal control logic state. Then, the PCU issues hydrogen injection quantity and ignition timing commands according to the current power demand, and the engine starts normally.

[0037] To better understand the coordinated control process of the hydrogen engine and hybrid system in steps S101-S103, a specific embodiment is given below: During normal vehicle operation, when the PCU issues a hydrogen engine start command, if the current vehicle speed is greater than 50 km / h, the residual hydrogen operation will begin. The specific operation is as follows: a: The PCU controls the generator to start and reverse (to drag the hydrogen engine in reverse), and the speed at which the crankshaft of the engine rotates is maintained at 300-500 rpm.

[0038] b: The PCU controls the hydrogen engine throttle valve to be fully open to a degree greater than 98%, and the turbocharger exhaust bypass valve to be fully open to a degree greater than 98%.

[0039] After performing the residual hydrogen operation and holding for 10 seconds, the PCU controls the hydrogen engine throttle valve and turbocharger exhaust bypass valve to return to the default state, i.e., the normal control logic state. Then, the PCU issues hydrogen injection quantity and ignition timing commands according to the current power demand, and the engine starts normally.

[0040] In this embodiment, hydrogen is removed by direct exhaust 10 seconds before the hydrogen engine starts, which can completely remove residual hydrogen and avoid the risk of explosion caused by abnormal hydrogen. Furthermore, the efficiency of removing residual hydrogen is improved by using reverse dragging and controlling the throttle to be fully open.

[0041] In other embodiments, during the actual removal of residual hydrogen, various factors, such as device aging, may prevent the removal of residual hydrogen within the first preset time period. Therefore, to ensure the safety of subsequent hydrogen engine startup, further processing of the hydrogen engine is necessary. Therefore, refer to... Figure 2 As shown, after the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default states, and the hydrogen engine is controlled to execute the start command, including steps S201-S203: S201, after a first preset time period, obtain the hydrogen concentration in the vehicle's exhaust manifold.

[0042] S202, if the hydrogen concentration is less than the first threshold, control the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve to return to the default state, and control the hydrogen engine to execute the start command.

[0043] S203, if the hydrogen level is not less than the first threshold, after the third preset time period, control the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve to return to the default state, and control the hydrogen engine to execute the start command.

[0044] In this embodiment, the third preset time period can be 5 seconds. The specific value can be set according to the actual situation, and will not be elaborated here.

[0045] The first threshold mentioned above can be 0.4%. The specific value can be set according to the actual situation, and will not be elaborated here.

[0046] Specifically, after executing step S102 for 10 seconds, the PCU does not immediately control the hydrogen engine to execute the start command. Instead, it controls the exhaust manifold hydrogen concentration sensor to obtain the hydrogen concentration in the vehicle's exhaust manifold. If the hydrogen concentration is less than 0.4%, it controls the hydrogen engine throttle and turbocharger wastegate valve to return to their default states and controls the hydrogen engine to execute the start command. If the hydrogen concentration is greater than 0.4%, it indicates that the residual hydrogen removal is not as expected and must continue to be removed. Therefore, step S102 is executed again for 5 seconds. After 5 seconds, the hydrogen engine throttle and turbocharger wastegate valve are controlled to return to their default states and the hydrogen engine is controlled to execute the start command.

[0047] In this embodiment of the disclosure, by detecting the hydrogen concentration, it can be ensured that residual hydrogen is completely removed, thereby ensuring the safety of starting the hydrogen engine.

[0048] In other embodiments, during the actual residual hydrogen removal process, if the hydrogen concentration is not less than the first threshold after steps S201-S203, it indicates that the residual hydrogen removal is not as expected. In this case, the hydrogen engine is stopped from starting, and fault information is generated and sent to the user or a fault alarm is issued.

[0049] In some embodiments, during actual hydrogen engine operation, the shutdown of the hydrogen engine also produces residual hydrogen. To ensure that the residual hydrogen after engine shutdown meets expectations, further processing of the hydrogen engine shutdown process is required. Therefore, refer to... Figure 3 As shown, the method further includes steps S301-S302: S301, during the operation of the hydrogen engine, when a shutdown command is issued to the hydrogen engine, controls the hydrogen engine to enter a stable operating condition and maintain it for a second preset time period.

[0050] In some embodiments, stable operating conditions include: the hydrogen engine speed is within a first range, the hydrogen engine load is within a second range, and the hydrogen engine air-fuel ratio is not greater than a safety threshold.

[0051] In some embodiments, the second preset time period can be 5 minutes. The specific value can be set according to the actual situation, and will not be elaborated here.

[0052] S302, after the second preset time period, controls the hydrogen engine to execute a shutdown command.

[0053] Specifically, after the above steps S101-S103, the hydrogen engine has started to run. If the PCU issues a shutdown command to the hydrogen engine, the hydrogen engine does not directly execute the shutdown command. Instead, it first controls the hydrogen engine to enter a stable operating condition and maintains it for 5 minutes. Through 5 minutes of operation under stable conditions, the hydrogen content in the hydrogen engine drops to a safe range. Therefore, after 5 minutes, the hydrogen engine is controlled to execute the shutdown command and the hydrogen injection is cut off.

[0054] The first range mentioned above can be (1150rpm, 1250rpm). The specific value can be set according to the actual situation, and will not be elaborated here.

[0055] The second range mentioned above can be (70Nm, 90Nm). The specific value can be set according to the actual situation, and will not be elaborated here.

[0056] In some embodiments, reference Figure 4 As shown, controlling the air-fuel ratio of the hydrogen engine to be no greater than a safety threshold includes steps S401-S402: S401, obtain the current air-fuel ratio of the hydrogen engine.

[0057] S402, if the air-fuel ratio is greater than the safety threshold, the excess air coefficient of the hydrogen engine is lowered by a preset threshold to obtain a new excess air coefficient, and the air-fuel ratio corresponding to the new excess air coefficient is obtained until the air-fuel ratio is not greater than the safety threshold and continues for a second preset time period.

[0058] The safety threshold can be 5%. The specific value can be set according to the actual situation, and will not be elaborated here.

[0059] Regarding step S401 above, refer to Figure 5 As shown, obtaining the air-fuel ratio of the hydrogen engine at the current moment includes steps S501-S502: S501 can acquire the crankshaft speed of the drive engine or the vibration value of the hydrogen engine in real time.

[0060] Specifically, the vibration value of the hydrogen engine can be obtained in real time through a detonation sensor, and the crankshaft speed of the drive engine can be obtained in real time through a crankshaft position sensor. The specific acquisition method is not limited; other methods can be used, which will not be elaborated upon here.

[0061] S502 determines the air-fuel ratio of a hydrogen engine based on rotational speed or vibration values.

[0062] Specifically, the air-fuel ratio of a hydrogen engine can be obtained through a calculation formula based on the engine speed or vibration value. The calculation formula is as follows:

[0063] in, air-fuel ratio, This represents the average value of the rotational speed or vibration value within the average calculation period, where n is the number of rotational speed or vibration values ​​collected within the average calculation period. It is the difference between the i-th rotational speed or vibration value and the corresponding average value.

[0064] The calculation period can be 5s, 10s, etc. The specific value can be set according to the actual situation, and will not be elaborated here.

[0065] To better understand the process of calculating the air-fuel ratio in this solution, a specific example is given below: Within 5 seconds before the current moment, a vibration value is acquired every 1 second, for a total of six vibration values. First, the average of the six vibration values ​​is calculated, then the difference between each vibration value and the average value is calculated, and finally, all parameters are substituted into the above calculation formula to obtain the air-fuel ratio at the current moment.

[0066] In some embodiments, for step S402 above, the excess air coefficient is ≥2.0.

[0067] The preset threshold can be between 0.1 and 1.5, for example, it can be 0.1. The specific value can be set according to the actual situation, and will not be elaborated here.

[0068] Specifically, if the air-fuel ratio is greater than the safety threshold, the excess air coefficient of the hydrogen engine will be reduced by 0.1. For example, if the initial value of the excess air coefficient is 10, the excess air coefficient will be 9.9 after the first reduction, 9.8 after the second reduction, and so on.

[0069] In some embodiments, during the actual coordinated control of the hydrogen engine and hybrid system, if the vehicle is restarted after being shut down, hydrogen may leak from the hydrogen engine due to factors such as equipment aging. Therefore, to ensure the safe starting of the hydrogen engine, further treatment of the hydrogen engine is required. (Refer to...) Figure 6 As shown, the method further includes steps S601-S603: S601, after controlling the hydrogen engine to execute the shutdown command, obtains the vehicle's driving status.

[0070] S602, if the driving status is normal driving, when a start command is issued to the hydrogen engine, the hydrogen engine is controlled to execute the start command.

[0071] S603, if the driving state is off, when a start command is issued to the hydrogen engine, it performs the operation of controlling the hydrogen engine.

[0072] In this context, "normal driving" refers to the vehicle being in motion, and in this embodiment, "normal driving" also refers to the state where the vehicle has not yet been turned off after the hydrogen engine has been shut down.

[0073] In some embodiments, for step S602 above, if the driving state is normal driving, it means that the hydrogen engine was not turned off after the last shutdown. Therefore, at this time, a start command is issued to the hydrogen engine, and the PCU can directly control the hydrogen engine to execute the start command.

[0074] In some embodiments, if the driving state is in the off state in step S603, it means that the vehicle has been turned off. Therefore, when issuing a start command to the hydrogen engine, steps S101-S103 must be executed, that is, the vehicle must be restarted and driven, and the vehicle speed must be greater than the preset speed.

[0075] To better understand the detailed control process in this embodiment, a specific example is given below: If vehicle A is in motion and the hydrogen engine is operating normally, and the PCU controls the hydrogen engine to execute a shutdown command, and vehicle A is not turned off, if the PCU issues a start command again, it can directly control the hydrogen engine to execute the start command. If vehicle A is turned off and then restarted, when the PCU issues a start command, it needs to control the hydrogen engine to re-execute steps S101-S103.

[0076] To better understand the collaborative control process of the hydrogen engine and hybrid system in this solution, a specific application scenario is given below: Vehicle B features a 1.5L spark-ignition hydrogen engine and a P2 (Position 2, abbreviated as P2) hybrid system. Specific parameters include: Generator parameters: Maximum reverse torque 150N. m, reversing speed range 200-800rpm; After the vehicle is turned off, the hydrogen engine is started for the first time: when the vehicle speed is greater than 55km / h, the PCU issues a start command, the generator reverses to 400rpm, the hydrogen engine throttle valve and turbocharger exhaust bypass valve are fully opened for 10s, the hydrogen concentration in the exhaust manifold drops from 0.3% to 0.08%, and then hydrogen is injected and ignited, and the hydrogen engine starts successfully. Hydrogen engine shutdown procedure: After the PCU issues a shutdown command, the hydrogen engine maintains operation at 1200 rpm and 80 Nm load, and shuts down after 5 minutes. In this application, when a start command is issued to the hydrogen engine, the vehicle's current speed is obtained. If the vehicle speed is greater than a preset speed, the hydrogen engine is controlled to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle, and fully open the turbocharger exhaust bypass valve, maintaining this state for a first preset time period. After the first preset time period, the hydrogen engine throttle and turbocharger exhaust bypass valve are controlled to return to their default states, and the hydrogen engine is controlled to execute the start command. This application can completely empty the residual hydrogen in the hydrogen engine by reversing it during the first preset time period when the hydrogen engine is about to start. Furthermore, controlling the hydrogen engine throttle and turbocharger exhaust bypass valve to fully open accelerates the emptying of residual hydrogen, improves the efficiency of residual hydrogen removal, and avoids the risk of explosion due to excessively high residual hydrogen concentration.

[0077] The following describes an embodiment of the apparatus described in this application, which can be used to execute the hydrogen engine and hybrid system coordinated control method described in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the hydrogen engine and hybrid system coordinated control method described above in this application.

[0078] See Figure 7 This application shows a schematic diagram of the structure of a hydrogen engine and hybrid system coordinated control device according to an embodiment of the present application, specifically including: The execution unit 701 is used to perform control operations on the hydrogen engine when a start command is issued to the hydrogen engine.

[0079] The execution unit 701 includes: an acquisition unit 7011, a control unit 7012, and an execution unit 7013; The acquisition unit 7011 is used to acquire the vehicle speed at the current moment when a start command is issued to the hydrogen engine. Control unit 7012 is used to control the hydrogen engine to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle valve and fully open the turbocharger exhaust bypass valve if the vehicle speed is greater than the preset speed, and maintain this for a first preset time period. The starting unit 7013 is used to control the hydrogen engine throttle valve and the turbocharger exhaust bypass valve to return to their default states after a first preset time period, and to control the hydrogen engine to execute the start command.

[0080] In an exemplary embodiment, based on the above embodiments, the hydrogen engine and hybrid system coordinated control device 700 is further configured to: when a shutdown command is issued to the hydrogen engine during operation, control the hydrogen engine to enter a stable operating condition and maintain it for a second preset time period. The stable operating condition includes: the hydrogen engine speed is within a first range, the hydrogen engine load is within a second range, and the hydrogen engine air-fuel ratio is not greater than a safety threshold. After the second preset time period, the hydrogen engine is controlled to execute a shutdown command.

[0081] In an exemplary embodiment, based on the above embodiments, the hydrogen engine and hybrid system coordinated control device 700 is used to control the hydrogen engine to execute a stop command and then obtain the vehicle's driving status. If the driving status is normal driving, when a start command is sent to the hydrogen engine, the hydrogen engine is controlled to execute the start command; If the vehicle is in a stalled state, the system will control the hydrogen engine when a start command is sent to it.

[0082] In an exemplary embodiment, based on the above embodiments, the hydrogen engine and hybrid system coordinated control device 700 is used to control the air-fuel ratio of the hydrogen engine to be no greater than a safety threshold, specifically for: Obtain the current air-fuel ratio of the hydrogen engine; If the air-fuel ratio is greater than the safety threshold, the excess air coefficient of the hydrogen engine is lowered by a preset threshold to obtain a new excess air coefficient, and the air-fuel ratio corresponding to the new excess air coefficient is obtained until the air-fuel ratio is not greater than the safety threshold and continues for a second preset time period.

[0083] In an exemplary embodiment, based on the above embodiments, obtaining the air-fuel ratio of the hydrogen engine at the current moment includes: Real-time acquisition of crankshaft speed of drive engine or vibration value of hydrogen engine; The air-fuel ratio of a hydrogen engine is determined based on its rotational speed or vibration value.

[0084] In an exemplary embodiment, based on the above embodiments, the hydrogen engine and hybrid system coordinated control device 700 is used to control the hydrogen engine throttle valve and turbocharger exhaust bypass valve to return to their default states after a first preset time period, and to control the hydrogen engine to execute a start command, specifically for: After a first preset time period, the hydrogen concentration in the vehicle's exhaust manifold is obtained; If the hydrogen concentration is less than the first threshold, control the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve to return to the default state, and control the hydrogen engine to execute the start command; If the hydrogen level is not less than the first threshold, after the third preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are controlled to return to their default states, and the hydrogen engine is controlled to execute the start command.

[0085] In one exemplary embodiment, based on the above embodiments, the towing torque of the hydrogen engine during reverse towing is controlled to be greater than the minimum torque when the hydrogen engine starts.

[0086] In this application, when a start command is issued to the hydrogen engine, the vehicle's current speed is obtained. If the vehicle speed is greater than a preset speed, the hydrogen engine is controlled to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle, and fully open the turbocharger exhaust bypass valve, maintaining this state for a first preset time period. After the first preset time period, the hydrogen engine throttle and turbocharger exhaust bypass valve are controlled to return to their default states, and the hydrogen engine is controlled to execute the start command. This application can completely empty the residual hydrogen in the hydrogen engine by reversing it during the first preset time period when the hydrogen engine is about to start. Furthermore, controlling the hydrogen engine throttle and turbocharger exhaust bypass valve to fully open accelerates the emptying of residual hydrogen, improves the efficiency of residual hydrogen removal, and avoids the risk of explosion due to excessively high residual hydrogen concentration.

[0087] The apparatus in this application embodiment can execute the method provided in this application embodiment, and the implementation principle is similar. The actions performed by each module in the apparatus of each embodiment of this application correspond to the steps in the method of each embodiment of this application. For detailed functional descriptions of each module of the apparatus, please refer to the descriptions in the corresponding methods shown above, which will not be repeated here.

[0088] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing computer program instructions. When the computer program instructions are loaded and executed by a processor, they implement the steps of the above-described coordinated control method for a hydrogen engine and a hybrid system.

[0089] Based on the same inventive concept, this application provides an electronic device, see [link to relevant documentation]. Figure 8 The diagram shows a schematic of the structure of an electronic device in an embodiment of this application. The electronic device includes one or more memories 804, one or more processors 802, and at least one computer program stored in the memory 804 and executable on the processor 802. When the processor 802 executes the computer program, it implements the steps of the above-described method for coordinated control of hydrogen engine and hybrid system.

[0090] The bus architecture (represented by bus 800) can include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 802 and memory represented by memory 804. Bus 800 can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 805 provides an interface between bus 800 and receiver 801 and transmitter 803. Receiver 801 and transmitter 803 can be the same element, a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 802 is responsible for managing bus 800 and general processing, while memory 804 can be used to store data used by processor 802 during operation.

[0091] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0092] Based on the same inventive concept, this application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the above-described method for coordinated control of a hydrogen engine and a hybrid system.

[0093] Based on the same inventive concept, this application provides a vehicle including an on-board controller. The on-board controller stores computer program instructions. When the computer program instructions are loaded and executed by a processor, they implement the steps of the above-described coordinated control method of hydrogen engine and hybrid system.

[0094] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0095] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0096] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing computer program instructions, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0097] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for coordinated control of a hydrogen engine and a hybrid system, applicable to a control unit in a hybrid system, wherein the vehicle includes a hydrogen engine, characterized in that, The method includes: When a start command is issued to the hydrogen engine, operations to control the hydrogen engine are performed, including: Get the vehicle's current speed; If the vehicle speed is greater than the preset speed, control the hydrogen engine to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle valve and fully open the turbocharger exhaust bypass valve, and maintain this for a first preset time period. After the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default states, and the hydrogen engine is controlled to execute the start command.

2. The method according to claim 1, characterized in that, During the operation of the hydrogen engine, when a shutdown command is issued to the hydrogen engine, the hydrogen engine is controlled to enter a stable operating condition and maintained for a second preset time period. The stable operating condition includes: the hydrogen engine speed is within a first range, the hydrogen engine load is within a second range, and the hydrogen engine air-fuel ratio is not greater than a safety threshold. After the second preset time period, the hydrogen engine is controlled to execute a shutdown command.

3. The method according to claim 2, characterized in that, After controlling the hydrogen engine to execute the shutdown command, the vehicle's driving status is obtained; If the driving state is normal driving, when a start command is sent to the hydrogen engine, the hydrogen engine is controlled to execute the start command; If the driving state is a shut-off state, the operation of controlling the hydrogen engine is executed when a start command is issued to the hydrogen engine.

4. The method according to claim 2, characterized in that, Controlling the air-fuel ratio of a hydrogen engine to not exceed a safe threshold includes: Obtain the current air-fuel ratio of the hydrogen engine; If the air-fuel ratio is greater than the safety threshold, the excess air coefficient of the hydrogen engine is lowered by a preset threshold to obtain a new excess air coefficient, and the air-fuel ratio corresponding to the new excess air coefficient is obtained, until the air-fuel ratio is not greater than the safety threshold and continues for the second preset time period.

5. The method according to claim 4, characterized in that, The process of obtaining the air-fuel ratio of the hydrogen engine at the current moment includes: Real-time acquisition of crankshaft speed of drive engine or vibration value of hydrogen engine; The air-fuel ratio of the hydrogen engine is determined based on the rotational speed or the vibration value.

6. The method according to claim 1, characterized in that, After the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default states, and the hydrogen engine is controlled to execute a start command, including: After the first preset time period, the hydrogen concentration in the vehicle exhaust manifold is obtained; If the hydrogen concentration is less than the first threshold, control the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve to return to the default state, and control the hydrogen engine to execute the start command; If the amount of hydrogen is not less than the first threshold, after a third preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are controlled to return to their default states, and the hydrogen engine is controlled to execute the start command.

7. The method according to claim 1, characterized in that, The towing torque of the hydrogen engine during reverse towing is greater than the minimum torque required for starting the hydrogen engine.

8. A coordinated control device for a hydrogen engine and a hybrid system, applicable to a control unit in a hybrid system, wherein the vehicle includes a hydrogen engine, characterized in that, The device includes: The execution unit is configured to perform hydrogen engine control operations when a start command is issued to the hydrogen engine, the hydrogen engine control operations including: Get the vehicle's current speed; If the vehicle speed is greater than the preset speed, control the hydrogen engine to reverse, drive the engine crankshaft to rotate, fully open the hydrogen engine throttle valve and fully open the turbocharger exhaust bypass valve, and maintain this for a first preset time period. After the first preset time period, the throttle valve of the hydrogen engine and the turbocharger exhaust bypass valve are restored to their default states, and the hydrogen engine is controlled to execute the start command.

9. An electronic device comprising a processor and a memory, characterized in that, The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, it performs the operation as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when loaded and executed by a processor, perform the operations performed by the method as described in any one of claims 1 to 7.

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