Hydrogen fuel cell commercial vehicle emergency steering system and control method

Abstract

The application discloses a hydrogen fuel cell commercial vehicle emergency steering system and belongs to the technical field of hydrogen fuel cell vehicles. The hydrogen fuel cell commercial vehicle emergency steering system comprises a gas-driven oil pressurizing device, a high-pressure hydrogen flow regulating device, a hydrogen cylinder group, a steering oil tank, a steering machine, a steering control valve and a steering wheel. The steering wheel is connected with the steering control valve through a steering shaft, the steering oil tank is communicated with the steering control valve, and the steering control valve is communicated with the steering machine. The hydrogen cylinder group is communicated with the high-pressure hydrogen flow regulating device, the high-pressure hydrogen flow regulating device is communicated with the gas-driven oil pressurizing device, the gas-driven oil pressurizing device is communicated with the steering oil tank, the gas-driven oil pressurizing device is communicated with the steering control valve, and the steering control valve is communicated with the high-pressure hydrogen flow regulating device. The hydrogen fuel cell commercial vehicle emergency steering system can realize auxiliary steering under the condition that the whole vehicle is powered off, and can better guarantee the safety of the whole vehicle. The hydrogen fuel cell commercial vehicle emergency steering system solves the problem that the steering system will be faulty when the high-voltage power supply system of the vehicle is faulty, and the safety of the vehicle is seriously affected.

Description

Technical Field

[0001] This invention relates to the field of hydrogen fuel cell vehicle technology, and in particular to an emergency steering system and control method for a hydrogen fuel cell commercial vehicle. Background Technology

[0002] The statements in this section merely refer to the background art related to this invention and do not necessarily constitute prior art.

[0003] Hydrogen fuel cells are the most promising new generation of green energy power systems in the 21st century. With the development of technology, hydrogen fuel cell vehicles are gradually becoming a replacement for traditional fuel vehicles.

[0004] Currently, most hydrogen fuel cell commercial vehicles use hydraulic power steering. The hydraulic pressure in the high-pressure pipeline of the steering system is about 100 bar. The hydraulic pressure is adjusted by an electric motor driving an oil pump to compress the oil. When the vehicle's high-voltage power supply system fails, the power steering pump motor loses power, the oil pressure drops, and the steering system will malfunction, seriously affecting the vehicle's driving safety. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an emergency steering system and control method for hydrogen fuel cell commercial vehicles, which can reduce the safety hazards caused by loss of steering assist when the power steering pump motor power supply system of existing hydrogen fuel cell commercial vehicles malfunctions.

[0006] In a first aspect, the present invention provides an emergency steering system for hydrogen fuel cell commercial vehicles;

[0007] An emergency steering system for a hydrogen fuel cell commercial vehicle includes a gas-driven hydraulic pressurization device, a high-pressure hydrogen flow regulating device, a hydrogen cylinder group, a steering oil tank, a steering gear, a steering control valve, and a steering wheel;

[0008] The steering wheel is connected to the steering control valve via a steering shaft, the steering fluid reservoir is connected to the steering control valve, and the steering control valve is connected to the steering gear;

[0009] The hydrogen cylinder group is connected to the high-pressure hydrogen flow regulating device, the high-pressure hydrogen flow regulating device is connected to the gas-driven hydraulic booster device, the gas-driven hydraulic booster device is connected to the steering oil tank, the gas-driven hydraulic booster device is connected to the steering control valve, and the steering control valve is connected to the high-pressure hydrogen flow regulating device.

[0010] Furthermore, the gas-driven hydraulic booster includes a cylinder sealed at both ends, and a piston plate assembly that can move along the cylinder axis is provided in the cylinder to divide the interior of the cylinder into a high-pressure hydrogen chamber and a steering hydraulic chamber.

[0011] The high-pressure hydrogen chamber is connected to the high-pressure hydrogen flow regulating device, and the steering fluid chamber is connected to both the high-pressure hydrogen flow regulating device and the steering control valve.

[0012] Preferably, the steering fluid chamber is connected to an accumulator, and the accumulator is connected to the steering control valve.

[0013] Furthermore, the high-pressure hydrogen flow regulating device includes a valve body, the hydrogen cylinder group is connected to the valve body, and the valve body is connected to the gas-driven oil pressurization device;

[0014] The valve body is provided with a spring diaphragm, the upper end of the spring diaphragm is provided with a steering gear cavity oil inlet piston, and the lower end of the spring diaphragm is provided with an oil inlet piston.

[0015] Furthermore, a shuttle valve is provided between the steering control valve and the high-pressure hydrogen flow regulating device, and the shuttle valve has a first oil inlet, a second oil inlet and an oil outlet;

[0016] The first fluid inlet is connected to the steering control valve to allow steering fluid to flow into the right chamber of the steering gear; the second fluid inlet is connected to the steering control valve to allow steering fluid to flow into the left chamber of the steering gear.

[0017] The oil outlet is connected to the high-pressure hydrogen flow regulating device.

[0018] Preferably, the shuttle valve is provided with a sealing ball, which is located between the first oil inlet and the second oil inlet, and above the oil outlet.

[0019] Furthermore, a power steering pump is provided between the steering oil reservoir and the steering control valve.

[0020] Secondly, the present invention provides an emergency steering control method for hydrogen fuel cell commercial vehicles;

[0021] An emergency steering control method for a hydrogen fuel cell commercial vehicle, based on the aforementioned emergency steering system for hydrogen fuel cell commercial vehicles, includes the following steps:

[0022] When the driver turns the steering wheel, the pressure of the steering fluid in the cavity on one side of the steering gear increases. The high-pressure hydrogen flow regulating device is activated, and high-pressure hydrogen enters the gas-driven fluid pressurization device from the hydrogen cylinder group to increase the pressure of the steering fluid and assist the steering wheel in turning.

[0023] At the same time, as the steering fluid is pressurized, the opening angle of the high-pressure hydrogen flow regulating device gradually decreases, and the pressurization rate of the steering fluid decreases synchronously until it tends to reach equilibrium.

[0024] Furthermore, the pressure of the steering fluid in the cavity on one side of the steering gear increases, flowing into the valve body, creating a pressure difference between the two ends of the spring diaphragm, causing the spring diaphragm to move downwards and the valve body to open.

[0025] Furthermore, high-pressure hydrogen enters the high-pressure hydrogen chamber of the gas-driven hydraulic booster, pushing the piston plate assembly downwards, which reduces the volume of the steering fluid chamber and increases the pressure, thereby boosting the steering fluid.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The technical solution provided by this invention allows for the adjustment of the pressure and flow control of the steering system fluid in fuel cell commercial vehicles when the power steering pump fails. This is achieved by a gas-driven fluid booster and a high-pressure hydrogen flow regulating device. The entire process does not require electrical control or power and can be implemented even when the vehicle is powered off, thus better ensuring the safety of the vehicle.

[0028] 2. The technical solution provided by this invention is that the high-pressure hydrogen flow regulating device uses the pressure difference between the two ends of a spring diaphragm to control the hydrogen flow rate. The entire process does not require electrical control and can adjust the high-pressure hydrogen flow rate even when the vehicle is powered off, thus better ensuring the safety of the vehicle.

[0029] 3. The technical solution provided by this invention utilizes the high pressure of high-pressure hydrogen to compress the steering fluid in the hydraulic chamber. The energy conversion process involves converting the effective energy stored in the high-pressure hydrogen into heat energy and the effective energy stored in the pressurized steering fluid, without the need for electrical energy. The entire process can be carried out when the vehicle is powered off, which improves energy utilization efficiency and better ensures vehicle safety.

[0030] 4. The technical solution provided by this invention adopts an accumulator structure. The accumulator is connected to the high-pressure oil outlet of the air-driven hydraulic booster device through a pipeline, and is also connected to the steering gear. That is, the oil pressure in the accumulator is the same as that of the high-pressure oil. In an emergency, when the driver operates the steering wheel, the power assist required for the steering gear action is instantly provided by the high-pressure oil in the accumulator. After the system response is normal, the power assist is provided by the air-driven hydraulic booster device. This extends the steering assist time and eliminates the impact on the air-driven hydraulic booster device and the high-pressure hydrogen flow regulating device when the driver quickly operates the steering wheel in an emergency. Attached Figure Description

[0031] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0032] Figure 1 This is a schematic diagram of the overall structure of the emergency steering system for a hydrogen fuel cell commercial vehicle provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the gas-driven oil booster device provided in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the high-pressure hydrogen flow regulating device provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the shuttle valve provided in an embodiment of the present invention;

[0036] The components include: 1. Hydrogen cylinder assembly; 2. High-pressure hydrogen flow regulating device; 21. High-pressure hydrogen inlet; 22. Valve body; 23. Spring diaphragm; 24. Steering gear chamber oil inlet; 25. Steering gear chamber oil inlet piston; 26. High-pressure hydrogen outlet; 27. Oil inlet piston; 28. Pressurized oil inlet; 3. Air-driven oil pressurization device; 31. Flow regulating high-pressure hydrogen inlet; 32. Cylinder; 33. High-pressure hydrogen chamber; 34. Piston plate assembly; 35. Steering oil chamber; 36. First high-pressure oil outlet; 37. Second high-pressure oil outlet; 4. First check valve; 5. Power steering pump; 6. Steering oil tank; 7. Accumulator; 8. Steering gear; 9. Shuttle valve; 91. First oil inlet; 92. Oil outlet; 93. Sealing ball; 10. Steering control valve; 11. Second check valve; 12. Steering wheel. Detailed Implementation

[0037] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0039] Example 1

[0040] Currently, the steering system of hydrogen fuel cell commercial vehicles relies on an electric motor to drive an oil pump for assisted steering. When the vehicle experiences a power outage, the steering system cannot function properly, affecting driving safety. Therefore, this invention provides an emergency steering system for hydrogen fuel cell commercial vehicles, organically combining the hydrogen storage system and steering system to achieve assisted steering without electrical power in emergency situations.

[0041] Next, combined Figures 1-4 This embodiment provides a detailed description of an emergency steering system for a hydrogen fuel cell commercial vehicle.

[0042] The emergency steering system for this hydrogen fuel cell commercial vehicle includes a gas-driven hydraulic pressurization device 3, a high-pressure hydrogen flow regulating device 2, a hydrogen cylinder group 1, a steering oil tank 6, a steering gear 8, a steering control valve 10, an accumulator 7, a steering power pump 5, and a steering wheel 12. The steering wheel 12 is connected to the steering control valve 10 via a steering shaft. The steering oil tank 6 is connected to the steering control valve 10 via the steering power pump 5, and the steering control valve 10 is connected to the steering gear 8. The hydrogen cylinder group 1 is connected to the high-pressure hydrogen flow regulating device 2, which is connected to the gas-driven hydraulic pressurization device 3. The gas-driven hydraulic pressurization device 3 is connected to the steering oil tank 6, which is connected to the steering control valve 10. The steering control valve 10 is connected to the high-pressure hydrogen flow regulating device 2. The accumulator 7 is connected to the steering oil tank 6, the gas-driven hydraulic pressurization device 3, and the steering control valve 10.

[0043] Furthermore, as one implementation method, such as Figure 2 As shown, the high-pressure hydrogen flow regulating device 2 includes a valve body 22, inside which a spring diaphragm 23 is installed. The upper end of the spring diaphragm 23 has a steering gear chamber oil inlet 24, and a steering gear chamber oil inlet piston 25 is installed inside the steering gear chamber oil inlet 24. The lower end of the spring diaphragm 23 has a pressurized oil inlet 28, and an oil inlet piston 27 is installed inside the pressurized oil inlet 28. One end of the valve body 22 along its length has a high-pressure hydrogen inlet 21, and the other end along its length has a high-pressure hydrogen outlet 26.

[0044] like Figure 3 As shown, the gas-driven hydraulic booster device 3 includes a cylinder 32 sealed at both ends. A piston plate assembly 34, movable along the axis of the cylinder 32, divides the interior of the cylinder 32 into a high-pressure hydrogen chamber 33 and a steering hydraulic chamber 35. A high-pressure hydrogen inlet 31 with flow regulation is provided on one side of the high-pressure hydrogen chamber 33, a first high-pressure hydraulic outlet 36 is provided on one side of the steering hydraulic chamber 35, and a second high-pressure hydraulic outlet 37 is provided on one side of the steering hydraulic chamber 35.

[0045] The design of the piston plate assembly 34 needs to be based on the working pressure of the emergency steering system of the hydrogen fuel cell commercial vehicle and the pressure of high-pressure hydrogen. For example, if the working pressure of the emergency steering system of the hydrogen fuel cell commercial vehicle is 100 bar and the pressure of high-pressure hydrogen is 350 bar, then the ratio of the side area of ​​the high-pressure hydrogen chamber 33 to the side area of ​​the steering fluid chamber 35 of the piston plate assembly 34 can be set to 1:3.5.

[0046] like Figure 4As shown, a shuttle valve 9 is installed between the steering control valve 10 and the high-pressure hydrogen flow regulating device 2. The shuttle valve 9 has a first oil inlet 91, a second oil inlet, and an oil outlet 92. The shuttle valve 9 has a T-shaped structure. The first oil inlet 91 is located at one end of the shuttle valve 9 along its length, the second oil inlet 91 is located at the other end of the shuttle valve 9 along its length, and the oil outlet 92 is located at the bottom end of the shuttle valve 9. A sealing ball 93 is placed inside the shuttle valve 9. The sealing ball 93 is located between the first oil inlet 91 and the second oil inlet, and is located above the oil outlet 92.

[0047] The first oil inlet is connected to the steering control valve 10, and through the steering control valve 10, it is connected to the right cavity of the steering gear 8 to allow the steering oil in the right cavity of the steering gear 8 to flow; the second oil inlet is connected to the steering control valve 10, and through the steering control valve 10, it is connected to the left cavity of the steering gear 8 to allow the steering oil in the left cavity of the steering gear 8 to flow; the oil outlet 92 is connected to the steering gear cavity oil inlet 24 of the high-pressure hydrogen flow regulating device 2, and the pressurized oil inlet piston 27 is connected to the second high-pressure oil outlet 37.

[0048] When the driver turns the steering wheel 12 to the right, the liquid pressure in the right chamber of the steering gear 8 increases, while the liquid pressure in the left chamber decreases. At this time, the pressure transmitted to the oil inlet 24 of the steering gear cavity of the high-pressure hydrogen flow regulating device 2 through the shuttle valve 9 is the liquid pressure in the right chamber of the steering gear 8, and vice versa.

[0049] The position of the spring diaphragm 23 is determined by the positions of the two inlet pistons, and the oil pressure at the two inlets in turn determines the positions of the two inlet pistons. When the oil pressure at the pressurized oil inlet piston 27 is less than the oil pressure at the steering gear cavity oil inlet 24, the valve body 22 is in the open state. The greater the difference, the greater the opening of the valve body 22. When the oil pressure at the pressurized oil inlet piston 27 is greater than or equal to the oil pressure at the steering gear cavity oil inlet 24, the valve body 22 is in the closed state under the action of the spring diaphragm 23.

[0050] The high-pressure hydrogen inlet 21 of the high-pressure hydrogen flow regulating device 2 is connected to the hydrogen cylinder group 1, and the high-pressure hydrogen outlet 26 is connected to the high-pressure hydrogen inlet 31 after flow regulation; the first high-pressure oil outlet 36 is connected to the steering control valve 10, the accumulator 7 and the steering power pump 5 respectively, and a first check valve 4 is installed between the steering power pump 5 and the steering control valve 10. The first check valve 4 is located between the steering power pump 5 and the first high-pressure oil outlet 36; a second check valve 11 is installed between the first high-pressure oil outlet 36 and the steering control valve 10; the accumulator 7 is connected to the steering control valve 10, and the steering oil tank 6 is connected to the steering control valve 10.

[0051] When high-pressure hydrogen enters the high-pressure hydrogen chamber 33, the high pressure pushes the piston plate assembly 34 towards the steering fluid chamber 35, reducing the chamber volume and increasing the pressure, thereby boosting the steering fluid pressure. Once the pressure is balanced, the boosted steering fluid flow rate can be adjusted according to the high-pressure hydrogen flow rate.

[0052] In this embodiment, the above-mentioned components are connected by pipelines.

[0053] Example 2

[0054] This embodiment discloses an emergency steering control method for a hydrogen fuel cell commercial vehicle, based on the emergency steering system for hydrogen fuel cell commercial vehicles described in Embodiment 1, applied when the power steering pump 5 fails to work properly, including the following steps:

[0055] When the driver turns the steering wheel 12, the pressure of the steering fluid in one cavity of the steering gear 8 increases, the high-pressure hydrogen flow regulating device 2 is activated, and high-pressure hydrogen enters the gas-driven fluid pressurizing device 3 from the hydrogen cylinder group 1 to pressurize the steering fluid and assist the steering wheel 12 in turning.

[0056] At the same time, as the steering fluid is pressurized, the opening angle of the high-pressure hydrogen flow regulating device 2 gradually decreases, and the pressurization rate of the steering fluid decreases synchronously until it tends to reach equilibrium.

[0057] Furthermore, the specific work steps are as follows:

[0058] (1) The oil pressure in the entire steering system will be reduced to normal pressure, i.e. atmospheric pressure. The liquid pressure of the oil inlet piston 27 after pressurization in the high-pressure hydrogen flow regulating device 2 is atmospheric pressure. If the driver turns the steering wheel 12, the volume of the steering gear cavity changes under the action of the mechanical structure of the steering gear 8. The liquid pressure in the cavity on the side with smaller volume increases, which is significantly higher than atmospheric pressure, and flows into the oil inlet 24 of the steering gear cavity.

[0059] In the high-pressure hydrogen flow regulating device 2, the liquid pressure at the steering gear cavity oil inlet 24 is the same as the liquid pressure inside the steering gear cavity, and is also significantly higher than atmospheric pressure, and higher than the liquid pressure at the boosted oil inlet piston 27. There is a large pressure difference between the two ends of the spring diaphragm 23 of the high-pressure hydrogen flow regulating device 2. The spring diaphragm 23 moves towards the boosted oil inlet piston 27, and the valve body 22 of the high-pressure hydrogen flow regulating device 2 is 100% open, allowing high-pressure hydrogen to enter the high-pressure hydrogen chamber 33 of the gas-driven oil booster device 3.

[0060] The high pressure brought by the high-pressure hydrogen pushes the piston plate assembly 34, which reduces the volume of the steering fluid chamber 35 and increases the pressure, thereby increasing the pressure of the steering fluid to assist the steering wheel 12 in steering.

[0061] A portion of the pressurized steering fluid flows into the pressurized fluid inlet piston 27. Under the action of the air-driven fluid pressurization device 3, the liquid pressure of the pressurized fluid inlet piston 27 in the high-pressure hydrogen flow regulating device 2 gradually increases. The pressure difference between the two ends of the spring diaphragm 23 of the high-pressure hydrogen flow regulating device 2 gradually decreases. The opening angle of the valve body 22 of the high-pressure hydrogen flow regulating device 2 gradually decreases. The rate at which high-pressure hydrogen enters the air-driven fluid pressurization device 3 gradually decreases, and the liquid pressurization rate decreases synchronously, eventually reaching equilibrium.

[0062] When the liquid pressure at the pressurized oil inlet piston 27 in the high-pressure hydrogen flow regulating device 2 is the same as the liquid pressure at the oil inlet 24 of the steering gear cavity, the pressure difference between the two ends of the spring diaphragm 23 of the high-pressure hydrogen flow regulating device 2 is 0, the valve body 22 is closed, and the emergency steering is completed.

[0063] (2) After the pressure adjustment is completed, the hydraulic pressure of the entire steering system is within the normal working range. When the driver operates the steering wheel 12, the entire system can be balanced by adjusting the liquid pressure and flow rate as described in step (1).

[0064] (3) After pressurization, part of the oil participates in the steering process to assist the vehicle, and part is stored in the accumulator 7 to extend the steering assist time. At the same time, it can eliminate the impact of the driver's rapid operation of the steering wheel 12 on the air-driven oil pressurization device 3 and the high-pressure hydrogen flow regulating device 2 in an emergency.

[0065] The accumulator 7 is connected to the first high-pressure oil outlet 92 of the air-driven hydraulic booster device 3 via a pipeline, and is also connected to the steering gear 8. That is, the oil pressure in the accumulator 7 is the same as that in the high-pressure oil. In an emergency, when the driver operates the steering wheel 12, the power assist required for the steering gear movement is instantly provided by the high-pressure oil in the accumulator 7. After the system response is normal, the power assist is provided by the air-driven hydraulic booster device 3.

[0066] Furthermore, when the steering system of the hydrogen fuel cell commercial vehicle is functioning normally, the power source for the pressure and flow of the power steering fluid comes from the power steering pump 5. When the driver turns the steering wheel 12, the control valve and the steering gear 8 control the flow of the fluid and interact with each other to achieve the steering of the vehicle according to the driver's intention. During this process, the force exerted by the driver on the steering wheel 12 is assisted.

[0067] Specifically, the steering fluid flow is as follows: when the driver turns the steering wheel 12, the power steering pump 5 pressurizes the fluid from the steering fluid reservoir 6. The pressurized fluid then enters the steering gear 8 through the first one-way valve 4, the second one-way valve 11, and the steering control valve 10, thereby providing power assistance during the steering process.

[0068] The descriptions of each embodiment in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An emergency steering system for a hydrogen fuel cell commercial vehicle, characterized in that, Includes a gas-driven hydraulic booster, a high-pressure hydrogen flow regulating device, a hydrogen cylinder group, a steering oil tank, a steering gear, a steering control valve, and a steering wheel; The steering wheel is connected to the steering control valve via a steering shaft, the steering fluid reservoir is connected to the steering control valve, and the steering control valve is connected to the steering gear; The hydrogen cylinder group is connected to the high-pressure hydrogen flow regulating device, the high-pressure hydrogen flow regulating device is connected to the gas-driven oil pressurizing device, the gas-driven oil pressurizing device is connected to the steering oil tank, the gas-driven oil pressurizing device is connected to the steering control valve, and the steering control valve is connected to the high-pressure hydrogen flow regulating device. The high-pressure hydrogen flow regulating device includes a valve body, the hydrogen cylinder group is connected to the valve body, and the valve body is connected to the gas-driven oil pressurization device. The valve body is provided with a spring diaphragm, the upper end of the spring diaphragm is provided with a steering gear cavity oil inlet piston, and the lower end of the spring diaphragm is provided with an oil inlet piston. A shuttle valve is provided between the steering control valve and the high-pressure hydrogen flow regulating device. The shuttle valve has a first oil inlet, a second oil inlet and an oil outlet. The first oil inlet is connected to the steering control valve to allow steering fluid to flow into the right chamber of the steering gear; the second oil inlet is connected to the steering control valve to allow steering fluid to flow into the left chamber of the steering gear; and the oil outlet is connected to the high-pressure hydrogen flow regulating device.

2. The emergency steering system for hydrogen fuel cell commercial vehicles as described in claim 1, characterized in that, The gas-driven hydraulic booster includes a cylinder sealed at both ends, and a piston plate assembly that can move along the cylinder axis is provided in the cylinder to divide the interior of the cylinder into a high-pressure hydrogen chamber and a steering hydraulic chamber. The high-pressure hydrogen chamber is connected to the high-pressure hydrogen flow regulating device, and the steering fluid chamber is connected to both the high-pressure hydrogen flow regulating device and the steering control valve.

3. The emergency steering system for hydrogen fuel cell commercial vehicles as described in claim 2, characterized in that, The steering fluid chamber is connected to an accumulator, and the accumulator is connected to the steering control valve.

4. The emergency steering system for hydrogen fuel cell commercial vehicles as described in claim 1, characterized in that, The shuttle valve is equipped with a sealing ball, which is located between the first oil inlet and the second oil inlet, and above the oil outlet.

5. The emergency steering system for hydrogen fuel cell commercial vehicles as described in claim 1, characterized in that, A power steering pump is installed between the steering oil reservoir and the steering control valve.

6. An emergency steering control method for a hydrogen fuel cell commercial vehicle, characterized in that, The emergency steering system for hydrogen fuel cell commercial vehicles according to any one of claims 1-5 includes the following steps: When the driver turns the steering wheel, the pressure of the steering fluid in the cavity on one side of the steering gear increases. The high-pressure hydrogen flow regulating device is activated, and high-pressure hydrogen enters the gas-driven fluid pressurization device from the hydrogen cylinder group to increase the pressure of the steering fluid and assist the steering wheel in turning. At the same time, as the steering fluid is pressurized, the opening angle of the high-pressure hydrogen flow regulating device gradually decreases, and the pressurization rate of the steering fluid decreases synchronously until it tends to reach equilibrium.

7. The emergency steering control method for hydrogen fuel cell commercial vehicles as described in claim 6, characterized in that, The pressure of the steering fluid in the cavity on one side of the steering gear increases, flowing into the valve body and creating a pressure difference between the two ends of the spring diaphragm. The spring diaphragm moves downward, and the valve body opens.

8. The emergency steering control method for hydrogen fuel cell commercial vehicles as described in claim 6, characterized in that, High-pressure hydrogen enters the high-pressure hydrogen chamber of the gas-driven hydraulic booster, pushing the piston plate assembly downwards, which reduces the volume of the steering fluid chamber and increases the pressure, thus boosting the steering fluid.

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