An active safety control system and method for a hydrogen internal combustion engine

Abstract

The present invention belongs to the technical field of hydrogen internal combustion engines, and specifically provides an active safety control system and method for a hydrogen internal combustion engine. The system includes that the rear end of the intake pipe is connected to the engine intake port; a first pressure sensor and a first hydrogen concentration sensor are provided on the intake pipe; the engine body is connected with a breather through a breather pipe, and the breather is connected to the intake pipe through the breather pipe; a second pressure sensor and a second hydrogen concentration sensor are provided on the breather pipe; the second pressure sensor and the second hydrogen concentration sensor are respectively arranged on the breather pipes on both sides of the breather; the engine exhaust port is connected to a post-treatment device through a front exhaust pipe; a third hydrogen concentration sensor is provided on the front exhaust pipe; all sensors are connected to the engine ECU, and the engine ECU determines the engine state according to the signals collected by each sensor, and makes corresponding instructions according to the determination situation to suppress the risk in the budding state.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen internal combustion engines, and particularly to an active safety control system and method for a hydrogen internal combustion engine. Background Art

[0002] The automotive industry is facing huge pressure to reduce carbon emissions and must start from the fuel source to solve the carbon emission problem. As the core carrier for green electricity storage and conversion, hydrogen can effectively solve the problem of grid fluctuations caused by wind and solar power generation. When green hydrogen is produced from green electricity in the transportation industry, it can basically achieve zero carbon emissions during vehicle use, thus achieving carbon neutrality. In the vehicle field, there are two forms of using hydrogen as an energy source: fuel cells and hydrogen internal combustion engines. However, fuel cells currently have problems such as high cost, short lifespan, and poor reliability, making it difficult to be popularized and applied in a short time. A hydrogen internal combustion engine can be appropriately modified based on a traditional internal combustion engine, and its performance is equivalent to that of a traditional internal combustion engine. Therefore, it is a better alternative solution.

[0003] Compared with traditional gaseous fuels, the explosion limit ratio of hydrogen is much higher than that of low flash point fuels used in the existing transportation field. Moreover, due to its small molecular size, hydrogen is extremely easy to diffuse. These two characteristics will both cause the hydrogen internal combustion engine to explode during use. Currently, for the safety of vehicles equipped with hydrogen internal combustion engines, the focus is mainly on the hydrogen supply system, and less attention is paid to the engine body. If hydrogen diffuses into the intake system and reaches a certain concentration, it will cause "backfire" of the engine or even explosion of the intake pipe. If hydrogen diffuses into the crankcase and reaches a certain concentration, it will cause the crankcase to explode. If hydrogen diffuses into the exhaust system, it may burn out the aftertreatment. At the same time, the unburned hydrogen discharged into the atmosphere will cause certain pollution to the environment.

[0004] In order to prevent the dangers caused by hydrogen diffusion and environmental pollution, a closed crankcase ventilation system is usually adopted for hydrogen internal combustion engines. When the pipeline is blocked, the hydrogen concentration in the crankcase will increase, posing an explosion risk. When the hydrogen pipeline is disconnected, hydrogen diffuses into the atmosphere, which may cause the hydrogen concentration in the engine surrounding environment to increase, bringing certain risks to the user's use. Therefore, it is necessary to monitor the status of the crankcase ventilation system. Usually, a dual-pressure sensor diagnosis method or a conductive diagnosis device is used to detect the status of the crankcase ventilation system. The dual-pressure sensor diagnosis method has a risk of false alarms when the engine is in the idle state. The conductive diagnosis device cannot monitor the pipeline blockage status, and there is a risk of missed alarms when the pipeline is disconnected and the line is not disconnected. Summary of the Invention

[0005] Regarding the safety considerations of hydrogen engines, the focus is mainly on the hydrogen supply system. Since the explosion limit ratio of hydrogen is much higher than that of low-flash fuels in the existing transportation application fields, there is also an explosion risk in the engine body itself. At present, there is no perfect safety control system for hydrogen engines. In view of this, the present invention provides an active safety control system and method for hydrogen internal combustion engines.

[0006] In a first aspect, the technical solution of the present invention provides an active safety control system for a hydrogen internal combustion engine, including an engine body, an engine ECU, and an intake pipeline; the engine body is provided with an intake port and an exhaust port; the intake port is connected with an intake valve, and the exhaust port is connected with an exhaust valve;

[0007] The rear end of the intake pipeline is connected to the engine intake port;

[0008] A hydrogen nozzle is provided at the rear end of the intake pipeline, and the injection end of the hydrogen nozzle extends into the intake port. A first pressure sensor and a first hydrogen concentration sensor are provided on the intake pipeline; one hydrogen nozzle is provided for each cylinder of the engine;

[0009] The engine body is connected with a breather through a breather pipeline, and the breather is connected with the intake pipeline through the breather pipeline; a second pressure sensor and a second hydrogen concentration sensor are provided on the breather pipeline; the second pressure sensor and the second hydrogen concentration sensor are respectively provided on the breather pipelines on both sides of the breather;

[0010] The engine exhaust port is connected with a post-treatment device through a front exhaust pipeline; a third hydrogen concentration sensor is provided on the front exhaust pipeline;

[0011] The first hydrogen concentration sensor, the second hydrogen concentration sensor, the third hydrogen concentration sensor, the first pressure sensor, and the second pressure sensor are respectively connected to the engine ECU. The engine ECU determines the engine state according to the signals collected by each sensor and issues corresponding instructions according to the determination results.

[0012] As a preference of the technical solution of the present invention, the intake pipeline includes a first intake pipe and an intake manifold;

[0013] The front end of the intake manifold is connected to the first intake pipe, and the rear end of the intake manifold is connected to the engine intake port;

[0014] The hydrogen nozzle is provided at the rear end of the intake manifold, and the first pressure sensor and the first hydrogen concentration sensor are provided on the intake manifold.

[0015] As a preference of the technical solution of the present invention, the post-treatment device is connected with a rear exhaust pipeline to discharge the treated gas into the atmosphere;

[0016] The hydrogen nozzles are arranged at the rear end of the intake manifold. The ends of the hydrogen nozzles extend into the intake ports and are located in front of the intake valves. Each cylinder has an independent intake port, and each intake port is equipped with a hydrogen nozzle.

[0017] As a preference of the technical solution of the present invention, the breather pipeline includes a breather intake pipeline and a breather outlet pipeline;

[0018] The engine body is connected to the breather through the breather intake pipeline, and the breather is connected to the first intake pipeline through the breather outlet pipeline. After separating the oil in the engine blow-by gas, it is re-introduced into the engine to participate in combustion;

[0019] As a preference of the technical solution of the present invention, the system further includes a cab instrument panel. The engine ECU is connected to the cab instrument panel. The engine ECU determines the engine state according to the signals collected by each sensor and simultaneously sends different signals to the cab instrument panel.

[0020] As a preference of the technical solution of the present invention, when the second hydrogen concentration sensor is arranged on the breather outlet pipeline, the second pressure sensor is arranged on the breather intake pipeline or on the engine crankcase;

[0021] When the second pressure sensor is arranged on the breather outlet pipeline, the second hydrogen concentration sensor is arranged on the breather intake pipeline or on the engine crankcase.

[0022] As a preference of the technical solution of the present invention, the distance from the third hydrogen concentration sensor to the after-treatment device is not less than 1000 mm;

[0023] The first hydrogen concentration sensor is located at the rear end of the first pressure sensor and the distance from it to the end of the hydrogen nozzle is not less than 100 mm.

[0024] In a second aspect, the technical solution of the present invention provides a method for active safety control of a hydrogen internal combustion engine, including the following steps:

[0025] When the engine is stopped and not started, after the key switch is powered on, it is judged whether the measured values of the first hydrogen concentration sensor, the second hydrogen concentration sensor, and the third hydrogen concentration sensor meet the requirements;

[0026] Only when all the requirements are met, the engine is controlled to start;

[0027] When the requirements are not met, the engine ECU records the fault mode of the problematic hydrogen concentration sensor and simultaneously sends a signal indicating that the engine cannot start to the cab instrument panel;

[0028] After the engine starts normally, the engine ECU monitors the signals of each sensor in real time; when all the sensors are within the normal range, the engine ECU only monitors and does not output control signals;

[0029] If the measured value of the first hydrogen concentration sensor exceeds the set value, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel.

[0030] When the signal of the first hydrogen concentration sensor is within the normal range, but the measured value and the rising rate of the first pressure sensor exceed the set range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel.

[0031] As a preference of the technical solution of the present invention, the method further includes:

[0032] When the engine is running normally, if the measured value of the second hydrogen concentration sensor is higher than the normal range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel. If the measured value of the second hydrogen concentration sensor is lower than the normal range, the engine ECU sends a warning signal to the cab instrument panel. If the driver does not take any effective measures within the set time threshold, the engine ECU takes a torque limiting measure. If the measured value of the second hydrogen concentration sensor is within the normal range, but the measured value of the second pressure sensor is not within the set range, when the measured value of the second pressure sensor is lower than the set value a, the engine ECU sends a warning signal to the cab instrument panel. If the driver does not take any effective measures within the set time threshold, the engine ECU takes a torque limiting measure. If the measured value of the second pressure sensor is higher than the set value a, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel. When the second hydrogen concentration sensor and the second pressure sensor trigger warning signals simultaneously, the time is not superimposed, and the time is based on the time when the time threshold is reached first. The engine shutdown does not affect the time accumulation.

[0033] When the engine is running normally, if the measured value of the third hydrogen concentration sensor exceeds the set range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel.

[0034] As a preference of the technical solution of the present invention, the method further includes:

[0035] When the engine ECU issues a command, it records the signal status of each sensor.

[0036] The engine ECU diagnoses the fault mode based on the sensor signal status, determines the fault mode of the engine, and outputs diagnostic information to guide fault query and repair.

[0037] The software control system issues different control instructions based on the signals sent by the sensors. The states during the operation of the engine include: normal state, early warning state, and emergency shutdown state. In the normal state, the software control system does not perform any operations, but only monitors without signal output. In the early warning state, the software control system will output an alarm signal to the cab dashboard to remind the user to perform maintenance in a timely manner. When the early warning state exceeds a certain duration, torque limitation measures will be taken on the engine until the user has completed the maintenance. In the emergency shutdown state, an alarm signal is output to the cab dashboard, and at the same time, a shutdown instruction is directly sent to the engine ECU to prevent unnecessary risks caused by excessive hydrogen concentration in the engine. In addition, the software control system can also judge the fault mode of the engine according to different signals, record it in the engine ECU, and guide fault inspection and maintenance.

[0038] As can be seen from the above technical solutions, the present invention has the following advantages: Considering the use safety of the hydrogen engine, through hardware design and system control, the present invention can effectively evaluate the state of the engine and diagnose corresponding faults. At the same time, different control strategies are made according to the fault mode, and the risks brought by the abnormality of the hydrogen engine are effectively suppressed in the bud. The present invention has a simple structure, high flexibility, low cost, and a small misjudgment coefficient, and has extremely high promotion and application value.

[0039] In addition, the design principle of the present invention is reliable, the structure is simple, and it has a very wide application prospect.

[0040] Thus, compared with the prior art, the present invention has prominent substantive features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is a schematic structural diagram of the system provided by a specific embodiment of the present invention.

[0043] Figure 2 It is a schematic control diagram of the system provided by a specific embodiment of the present invention.

[0044] Figure 3 It is a determination logic diagram of the engine backfire fault in a specific embodiment of the present invention.

[0045] Figure 4 It is a determination logic diagram of the engine misfire fault in a specific embodiment of the present invention.

[0046] Figure 5 , Figure 6 is the nozzle leakage state determination logic diagram in a specific embodiment of the present invention.

[0047] Figure 7 is the crankcase state determination logic diagram in a specific embodiment of the present invention.

[0048] Figure 8 is the sensor connection block diagram provided by a specific embodiment of the present invention.

[0049] In the figure, 1 - the first intake pipe, 2 - the intake manifold, 3 - the breather intake pipe, 4 - the breather, 5 - the breather outlet pipe, 6 - the hydrogen nozzle, 7 - the front exhaust pipe, 8 - the aftertreatment device, 9 - the rear exhaust pipe, 10 - the engine ECU, 11 - the cab instrument panel, 12 - the first hydrogen concentration sensor, 13 - the first pressure sensor, 14 - the second pressure sensor, 15 - the second hydrogen concentration sensor, 16 - the third hydrogen concentration sensor, 17 - the engine body. Detailed implementation manners

[0050] In order to enable those skilled in the art of the present technology to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] As Figure 1 and Figure 8 shown, the embodiment of the present invention provides a hydrogen internal combustion engine active safety control system, including an engine body, an engine ECU 10, and an intake pipe; the engine body is provided with an intake passage and an exhaust passage, the intake passage is connected with an intake valve, and the exhaust passage is connected with an exhaust valve;

[0052] The rear end of the intake pipe is connected to the engine intake passage;

[0053] The rear end of the intake pipe is provided with a hydrogen nozzle 6, and the end of the hydrogen nozzle 6 extends into the intake passage and is located in front of the intake valve. Each cylinder of the engine has an independent intake passage, and each intake passage has a hydrogen nozzle. A first pressure sensor and a first hydrogen concentration sensor are provided on the intake pipe;

[0054] The engine body is connected with a breather 4 through a breather pipe, and the breather 4 is connected with the intake pipe through a breather pipe; a second pressure sensor and a second hydrogen concentration sensor are provided on the breather pipe; the second pressure sensor and the second hydrogen concentration sensor are respectively arranged on the breather pipes on both sides of the breather;

[0055] The engine exhaust passage is connected to a post-treatment device 8 through a front exhaust pipeline 7; a third hydrogen concentration sensor is provided on the front exhaust pipeline 7;

[0056] The first hydrogen concentration sensor, the second hydrogen concentration sensor, the third hydrogen concentration sensor, the first pressure sensor and the second pressure sensor are respectively connected to the engine ECU 10. The engine ECU 10 determines the engine state according to the signals collected by each sensor and issues corresponding instructions according to the determination results.

[0057] In some embodiments, the intake pipeline includes a first intake pipe 1 and an intake manifold 2;

[0058] The front end of the intake manifold 2 is connected to the first intake pipe 1, and the rear end of the intake manifold 2 is connected to the engine intake passage;

[0059] A hydrogen nozzle 6 is provided at the rear end of the intake manifold 2, and the first pressure sensor and the first hydrogen concentration sensor are provided on the intake manifold 2.

[0060] In some embodiments, the post-treatment device 8 is connected to a rear exhaust pipeline 9 to discharge the treated gas into the atmosphere;

[0061] In some embodiments, the breather pipeline includes a breather intake pipeline 3 and a breather outlet pipeline 5;

[0062] The engine body is connected to a breather 4 through the breather intake pipeline 3, and the breather 4 is connected to the first intake pipe 1 through the breather outlet pipeline 5 to separate the oil in the engine blow-by gas and re-introduce it into the engine;

[0063] When the second hydrogen concentration sensor is provided on the breather outlet pipeline 5; the second pressure sensor is provided on the breather intake pipeline 3 or on the engine crankcase;

[0064] When the second pressure sensor is provided on the breather outlet pipeline 5, the second hydrogen concentration sensor is provided on the breather intake pipeline 3 or on the engine crankcase.

[0065] In some embodiments, the system further includes a cab instrument panel 11. The engine ECU 10 is connected to the cab instrument panel 11. The engine ECU 10 determines the engine state according to the signals collected by each sensor and simultaneously sends different signals to the cab instrument panel 11.

[0066] In some embodiments, the distance from the third hydrogen concentration sensor to the post-treatment device 8 is not less than 1000 mm;

[0067] The first hydrogen concentration sensor is located at the rear end of the first pressure sensor and the distance from the end of the hydrogen nozzle 6 is not less than 100 mm.

[0068] As Figure 2 shown, an active safety control method for a hydrogen internal combustion engine provided by an embodiment of the present invention includes the following steps:

[0069] Step 1: When the engine is stopped and not started, after the key switch is powered on, determine whether the measured values of the first hydrogen concentration sensor, the second hydrogen concentration sensor, and the third hydrogen concentration sensor meet the requirements;

[0070] Step 2: Control the engine to start only when all requirements are met;

[0071] Step 3: When the requirements are not met, the engine ECU records the fault mode of the problematic hydrogen concentration sensor and simultaneously sends a signal indicating that the engine cannot start to the cab instrument panel;

[0072] Step 4: After the engine starts normally, the engine ECU monitors the signals of each sensor in real time; when all sensors are within the normal range, the engine ECU only monitors and does not output control signals;

[0073] Step 5: If the measured value of the first hydrogen concentration sensor exceeds the set value, the engine ECU issues an emergency stop command and simultaneously sends an emergency stop signal to the cab instrument panel;

[0074] Step 6: When the signal of the first hydrogen concentration sensor is within the normal range, but the measured value and the increase rate of the first pressure sensor exceed the set range, the engine ECU issues an emergency stop command and simultaneously sends an emergency stop signal to the cab instrument panel.

[0075] In some embodiments, the method further includes:

[0076] When the engine is running normally, if the measured value of the second hydrogen concentration sensor is higher than the normal range, the engine ECU issues an emergency stop command and simultaneously sends an emergency stop signal to the cab instrument panel. If the measured value of the second hydrogen concentration sensor is lower than the normal range, the engine ECU sends a warning signal to the cab instrument panel. If the driver does not take any effective measures within the set time threshold, the engine ECU takes a torque limiting measure. If the measured value of the second hydrogen concentration sensor is within the normal range, but the measured value of the second pressure sensor is not within the set range, when the measured value of the second pressure sensor is lower than the set value a, the engine ECU sends a warning signal to the cab instrument panel. If the driver does not take any effective measures within the set time threshold, the engine ECU takes a torque limiting measure. If the measured value of the second pressure sensor is higher than the set value a, the engine ECU issues an emergency stop command and simultaneously sends an emergency stop signal to the cab instrument panel. When the second hydrogen concentration sensor and the second pressure sensor simultaneously trigger the warning signal A, the time is not superimposed, and the time is based on the time that reaches the time threshold first. Engine shutdown does not affect time accumulation.

[0077] When the engine is running normally, if the measured value of the third hydrogen concentration sensor exceeds the set range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel.

[0078] In some actual examples, the method further includes:

[0079] When the engine ECU issues a command, it records the signal status of each sensor;

[0080] The engine ECU diagnoses the fault mode based on the sensor signal status, determines the fault mode of the engine, and outputs diagnostic information to guide fault query and repair.

[0081] The engine is divided into a shutdown state and an operating state. The operating state includes a normal state, a warning state, and an emergency shutdown state. Different alarm signals are sent to the cab instrument panel according to different states. The alarm signals are divided into 3 types, namely warning signal A, emergency shutdown signal B, and unable-to-start signal C. When the engine is in the normal state, no signal is displayed.

[0082] When the engine is stopped and not started, after the key switch is powered on, first judge whether the measured values of the first hydrogen concentration sensor, the second hydrogen concentration sensor, and the third hydrogen concentration sensor meet the requirements. Only when all meet the requirements, the engine is allowed to start. When the requirements are not met, the ECU records the fault mode of the problematic sensor and simultaneously sends an unable-to-start signal C to the cab instrument panel.

[0083] After the engine starts normally, the ECU monitors the signals of each sensor in real time. When all sensors are within the normal range, the ECU only monitors, the engine runs normally, and no signal is displayed on the cab instrument panel.

[0084] It should be noted that when the engine is running normally, if the measured value of the second hydrogen concentration sensor is higher than the normal range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal B to the cab instrument panel. If the measured value of the second hydrogen concentration sensor is lower than the normal range, the engine ECU sends a warning signal A to the cab instrument panel. If the driver does not take any effective measures within 12 hours, the engine ECU takes a torque limit measure. If the measured value of the second hydrogen concentration sensor is within the normal range, but the measured value of the second pressure sensor is not within the set range, when the measured value of the second pressure sensor is lower than the set value a, the engine ECU sends a warning signal A to the cab instrument panel. If the driver does not take any effective measures within 12 hours, the engine ECU takes a torque limit measure. If the measured value of the second pressure sensor is higher than the set value a, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal B to the cab instrument panel.

[0085] When the second hydrogen concentration sensor and the second pressure sensor trigger the warning signal A simultaneously, the time of the two is not superimposed, and the time is based on the time that first reaches the time threshold. Engine shutdown does not affect time accumulation.

[0086] When the engine is running normally, if the third hydrogen concentration sensor exceeds the normal range, the ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal B to the cab instrument panel.

[0087] The fault mode of the engine can be judged according to different sensor signals.

[0088] Such as Figure 3 As shown, when the engine is running normally and the measured value of the first hydrogen concentration sensor is within the normal range, if there is an instantaneous pressure fluctuation in the first pressure sensor, it can be judged that there is a backfire in the intake duct, and the ECU records the fault.

[0089] Such as Figure 4 As shown, when the engine is running normally, if the measured value of the third hydrogen concentration sensor exceeds the normal range, and at the same time, the measured values of the first pressure sensor, the second pressure sensor, the first hydrogen concentration sensor, and the second hydrogen concentration sensor are all within the set range, it can be judged that the engine has a misfire fault, and the ECU records the fault.

[0090] Such as Figure 5 and Figure 6 As shown, before the engine starts, if the measured value of the first hydrogen concentration sensor exceeds the set range, the nozzle leaks. After the engine starts normally, if the first hydrogen concentration sensor exceeds the normal range and continues to increase after shutdown, it can also be judged that the nozzle leaks. The ECU records the fault.

[0091] Such as Figure 7 As shown, when the engine is running normally, when the measured value of the second hydrogen concentration sensor exceeds the maximum value of the set range, it can be judged that the piston air leakage exceeds the standard. When the measured value of the second hydrogen concentration sensor is lower than the minimum value of the set range, it can be judged that the breather is open circuit fault. When the second hydrogen concentration sensor is within the normal range, but the second pressure sensor is higher than the normal range but lower than the set value a, it can be judged that the breather is also in the open state. When the second pressure sensor is higher than the set value a, it can be judged that the breather is blocked.

[0092] During operation, different control instructions are issued based on the signals sent by the sensors. The states during engine operation include: normal state, early warning state, and emergency shutdown state. In the normal state, the control system does not perform any operations, only monitors, and has no signal output. In the early warning state, the control system will output an alarm signal A to the cab dashboard to remind the user to perform maintenance in a timely manner. When the early warning state exceeds a certain duration, torque limiting measures will be taken on the engine until the user has completed the maintenance. In the emergency shutdown state, an alarm signal B is output to the cab dashboard, and at the same time, a shutdown instruction is directly sent to the engine ECU to prevent unnecessary risks caused by excessive hydrogen concentration in the engine. In addition, the software control system can also judge the fault mode of the engine according to different signals, record it in the ECU, and guide fault inspection and repair.

[0093] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention. / Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A control method for an active safety control system based on a hydrogen internal combustion engine, characterized in that, The system includes an engine body (17), an engine ECU (10) and an intake pipeline; the engine body (17) is provided with an intake passage and an exhaust passage; The rear end of the intake pipeline is connected to the engine intake passage; The rear end of the intake pipeline is provided with a hydrogen nozzle (6), and a first pressure sensor (13) and a first hydrogen concentration sensor (12) are arranged on the intake pipeline; The engine body is connected with a breather (4) through a breather pipeline, and the breather (4) is connected to the intake pipeline through the breather pipeline; a second pressure sensor (14) and a second hydrogen concentration sensor (15) are arranged on the breather pipeline; the second pressure sensor (14) and the second hydrogen concentration sensor (15) are respectively arranged on the breather pipelines on both sides of the breather (4); The engine exhaust passage is connected with a post-treatment device (8) through a front exhaust pipeline (7); a third hydrogen concentration sensor (16) is arranged on the front exhaust pipeline (7); The first hydrogen concentration sensor (12), the second hydrogen concentration sensor (15), the third hydrogen concentration sensor (16), the first pressure sensor (13) and the second pressure sensor (14) are respectively connected to the engine ECU (10), and the engine ECU (10) determines the engine state according to the signals collected by each sensor, and makes corresponding instructions according to the determination situation; The control method includes: When the engine is stopped and not started, after the key switch is powered on, it is judged whether the measured values of the first hydrogen concentration sensor, the second hydrogen concentration sensor and the third hydrogen concentration sensor meet the requirements; When and only when all meet the requirements, the engine is controlled to start; When the requirements are not met, the engine ECU records the fault mode of the problematic hydrogen concentration sensor, and at the same time sends a signal that the engine cannot start to the cab instrument panel; After the engine is normally started, the engine ECU monitors the signals of each sensor in real time; when all sensors are within the normal range, the engine ECU only monitors and does not output control signals; If the measured value of the first hydrogen concentration sensor exceeds the set value, the engine ECU issues an emergency shutdown instruction and at the same time sends an emergency shutdown signal to the cab instrument panel; When the signal of the first hydrogen concentration sensor is within the normal range, but the measured value and the rising rate of the first pressure sensor exceed the set range, the engine ECU issues an emergency shutdown instruction and at the same time sends an emergency shutdown signal to the cab instrument panel.

2. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 1, characterized in that The intake pipeline includes a first intake pipe (1) and an intake manifold (2); The front end of the intake manifold (2) is connected to the first intake pipe (1), and the rear end of the intake manifold (2) is connected to the engine intake passage; The rear end of the intake manifold (2) is provided with a hydrogen nozzle (6), and the end of the hydrogen nozzle (6) extends into the intake passage; the first pressure sensor (13) and the first hydrogen concentration sensor (12) are arranged on the intake manifold (2).

3. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 2, characterized in that The post-treatment device (8) is connected to a rear exhaust pipe (9) to vent the treated gas into the atmosphere; Each cylinder of the engine is correspondingly provided with a hydrogen nozzle, and the end of the hydrogen nozzle (6) extends into the intake passage of the corresponding cylinder.

4. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 3, characterized in that The breather pipe includes a breather intake pipe (3) and a breather outlet pipe (5); The engine body (17) is connected to the breather (4) through the breather intake pipe (3), and the breather (4) is connected to the first intake pipe (1) through the breather outlet pipe (5) to separate the oil in the engine blow-by gas and reintroduce it into the engine for combustion.

5. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 4, characterized in that The system further includes a cab instrument panel (11), and the engine ECU (10) is connected to the cab instrument panel (11). The engine ECU (10) determines the engine state according to the signals collected by each sensor and simultaneously sends different signals to the cab instrument panel (11).

6. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 5, characterized in that When the second hydrogen concentration sensor is arranged on the breather outlet pipe (5), the second pressure sensor is arranged on the breather intake pipe (3) or arranged on the engine crankcase; When the second pressure sensor is arranged on the breather outlet pipe (5), the second hydrogen concentration sensor is arranged on the breather intake pipe (3) or arranged on the engine crankcase.

7. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 6, characterized in that The distance from the third hydrogen concentration sensor to the post-treatment device (8) is not less than 1000 mm; The first hydrogen concentration sensor is located at the rear end of the first pressure sensor and the distance from the end of the hydrogen nozzle (6) is not less than 100 mm.

8. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 1, characterized in that, The method further includes: When the engine is running normally, if the measured value of the second hydrogen concentration sensor is higher than the normal range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel; If the measured value of the second hydrogen concentration sensor is lower than the normal range, the engine ECU sends a warning signal to the cab instrument panel. If the driver does not take any effective measures within the set time threshold, the engine ECU takes a torque limit measure; If the measured value of the second hydrogen concentration sensor is within the normal range, but the measured value of the second pressure sensor is not within the set range, when the measured value of the second pressure sensor is lower than the set value a, the engine ECU sends a warning signal to the cab instrument panel. If the driver does not take any effective measures within the set time threshold, the engine ECU takes a torque limit measure; If the measured value of the second pressure sensor is higher than the set value a, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab instrument panel; When the second hydrogen concentration sensor and the second pressure sensor trigger warning signals simultaneously, the time is not superimposed, and the time is based on the time that reaches the time threshold first; When the engine is running normally, if the measured value of the third hydrogen concentration sensor exceeds the set range, the engine ECU issues an emergency shutdown command and simultaneously sends an emergency shutdown signal to the cab dashboard.

9. The control method of the active safety control system based on a hydrogen internal combustion engine according to claim 8, wherein The method further includes: When the engine ECU issues a command, it records the signal status of each sensor; Based on the signal status of the sensors, the engine ECU diagnoses the fault mode, determines the fault mode of the engine, and outputs diagnostic information to guide fault query and repair.

Images