A hydrogen fuel cell vehicle energy control method and system

Abstract

The present application relates to the technical field of new energy vehicles, and discloses a hydrogen fuel cell vehicle energy control method and system, including obtaining the limp time according to the limp mileage and the limp speed; obtaining the power required for the vehicle's limp according to the limp speed; obtaining the energy required for limp according to the power required for limp and the limp time; judging the low-temperature cold start requirement of the entire vehicle according to the expected ambient temperature at shutdown; when the entire vehicle has a low-temperature cold start requirement, obtaining the energy required for the low-temperature cold start according to the expected ambient temperature at shutdown, and combining the energy required for limp to obtain the total energy required for limp; when the entire vehicle has no low-temperature cold start requirement, the energy required for limp is the total energy required for limp; and then controlling and adjusting the throughput of the power battery system; obtaining the adjusted output of the fuel cell system according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system; the present application can avoid the risk of downtime and reduce the impact and cost caused by towing vehicles.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and specifically to a hydrogen fuel cell vehicle energy control method and system. Background Art

[0002] Among new energy vehicles, hydrogen fuel cell vehicles are expected to become the most ideal form of clean energy in the future. Due to the relatively low power output of fuel cells, they are often paired with power batteries (or power packs) to "smooth out" the fuel cell power output. This hybrid dual-power architecture requires a matching energy control strategy for the dual-electric system to ensure that the vehicle's power requirements are met. At the same time, both energy devices must operate within high-efficiency and long-life operating ranges. Furthermore, due to the vehicle's dual-power architecture, a serious failure of either the fuel cell or power battery (or power pack) could render the vehicle inoperable. However, in the event of a serious fuel cell (or power pack) failure, the existing rule-based fuel cell and power battery energy control strategy is used to optimize the power battery (or power pack)'s stored energy to support the vehicle's range to the nearest repair station or charging station. This also ensures that the power battery pack has a pre-stored charge for low-temperature startup in winter, ensuring the normal startup of the fuel cell system. To ensure that the vehicle does not cease operation due to serious fuel cell or other non-power failures before reaching the nearest repair station or charging station, vehicle energy output must be controlled and adjusted.

[0003] Application Contents

[0004] The purpose of this application is to provide a hydrogen fuel cell vehicle energy control method and system that can avoid the risk of downtime due to vehicle power system failure and reduce the impact and costs caused by towing the vehicle back to a maintenance point or charging station.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A hydrogen fuel cell vehicle energy control method and system of the present invention includes obtaining driving path data and the vehicle's current location, and obtaining the limp home mileage between the vehicle's current location and the nearest maintenance station or charging station based on the path data and the vehicle's current location;

[0007] Get the lameness speed and get the lameness time based on the lameness mileage and lameness speed;

[0008] The power required for vehicle limp is calculated based on the limp speed;

[0009] The energy required for lameness is obtained based on the power required for lameness and the lameness time;

[0010] Get the expected shutdown ambient temperature based on the limp time;

[0011] Determine the vehicle's low-temperature cold start requirements based on the expected ambient temperature at shutdown;

[0012] When the vehicle needs to be cold-started at low temperatures, the energy required for cold-starting at low temperatures is calculated based on the expected ambient temperature at shutdown, and the total energy required for limp home operation is calculated based on the energy required for limp home operation and the energy required for cold-starting at low temperatures. When the vehicle does not need to be cold-started at low temperatures, the energy required for limp home operation is the total energy required for limp home operation.

[0013] Control and adjust the throughput of the power battery system according to the total energy required for limp home operation;

[0014] The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system.

[0015] Furthermore, the method for calculating the power required for limp home according to the limp home speed includes: calculating the power required for limp home according to Formula 1,

[0016]

[0017] Among them, v lame is the limp speed, r is the vehicle mechanical transmission efficiency, A is the vehicle frontal area, C d is the air resistance coefficient, F is the rolling resistance coefficient, and G is the weight of the vehicle.

[0018] Furthermore, the method for obtaining the energy required for a low-temperature cold start based on the current ambient temperature and the ambient temperature expected at shutdown includes: when the ambient temperature expected at shutdown is lower than 0°C, the temperature required for the system to complete a low-temperature cold start is calculated using Formula 2 based on the ambient temperature expected at shutdown.

[0019] ΔT=|T x |+K, Formula 2,

[0020] Among them, T x is the expected ambient temperature at shutdown, K is the temperature at which the fuel cell system can meet full power or specific power output conditions;

[0021] According to the temperature that needs to rise for the system to complete the low-temperature cold start, the energy required for the low-temperature cold start is calculated by formula 3.

[0022] E cs =C fcs ×m fcs ×ΔT, Formula 3,

[0023] Among them, C fcs is the comprehensive heat capacity of the fuel cell system, m fcs is the total mass of the fuel cell system.

[0024] Furthermore, the method for controlling and adjusting the throughput of the power battery system according to the total energy required for limp home operation includes: calculating the throughput of the power battery system output adjustment according to the total energy required for limp home operation using Formula 4,

[0025] SOC=E 总 / E 动 *100+B, formula 4,

[0026] Among them, E 总 is the total energy required for lameness, E 动 is the total charge of the power battery system, and B is the minimum charge of the power battery system;

[0027] The output of the power battery is adjusted according to the output throughput of the power battery system.

[0028] A hydrogen fuel cell vehicle energy control system, comprising a system for executing a hydrogen fuel cell vehicle energy control method:

[0029] The module includes a limp time control module: used to obtain driving path data and the vehicle's current location, and obtain the limp mileage between the vehicle's current location and the nearest maintenance station or charging station based on the path data and the vehicle's current location; obtain the limp speed, and obtain the limp time based on the limp mileage and the limp speed;

[0030] Limping energy calculation control module: used to calculate the power required for vehicle limp-ing according to limp-ing speed;

[0031] The energy required for lameness is obtained based on the power required for lameness and the lameness time;

[0032] Get the expected shutdown ambient temperature based on the limp time;

[0033] Determine the vehicle's low-temperature cold start requirements based on the expected ambient temperature at shutdown;

[0034] When the vehicle needs to be cold-started at low temperatures, the energy required for cold-starting at low temperatures is calculated based on the expected ambient temperature at shutdown, and the total energy required for limp home operation is calculated based on the energy required for limp home operation and the energy required for cold-starting at low temperatures. When the vehicle does not need to be cold-started at low temperatures, the energy required for limp home operation is the total energy required for limp home operation.

[0035] Limping energy output adjustment module: used to control and adjust the throughput of the power battery system according to the total energy required for limp driving;

[0036] The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] The vehicle's driving path data is input through the navigation system, and the vehicle's operating condition parameters are read. The vehicle's current location is obtained through the positioning device. The limp mileage between the vehicle's current location and the nearest maintenance station or charging pile is obtained based on the path data and the vehicle's current location. The limp time is obtained based on the limp mileage and limp speed. The power required for the vehicle's limp mileage is calculated based on the limp speed. The product of the power required for limp mileage and the limp time is the energy required for limp mileage. The ambient temperature is obtained through the ambient temperature sensor, and the estimated ambient temperature at shutdown is obtained by querying weather information based on the limp time. This can determine whether the vehicle needs a low-temperature cold start during the limp mileage to the nearest maintenance station or charging pile, and can perform more comprehensive and effective wind power management. Risk avoidance; when the whole vehicle has a low-temperature cold start requirement, the energy required for the low-temperature cold start is obtained according to the immediate ambient temperature and the expected ambient temperature when the vehicle is shut down, and the sum of the energy required for limp homeostasis and the energy required for the low-temperature cold start is the total energy required for limp homeostasis; when the whole vehicle does not have a low-temperature cold start requirement, the energy required for limp homeostasis is the total energy required for limp homeostasis; the throughput of the power battery system is controlled and adjusted according to the total energy required for limp homeostasis; the adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system, which can avoid the risk of vehicle shutdown due to power system failure; the present invention can avoid the risk of vehicle shutdown due to power system failure and reduce the impact and cost caused by towing the vehicle back to a maintenance point or charging station. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the following is a brief introduction to the drawings required for use in the implementation methods. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 It is a flowchart of the method of this application;

[0041] Figure 2 It is the output relationship curve between the power battery system and the fuel cell system. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0043] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show the layers related to the present invention and are not drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer can be changed arbitrarily, and the layer layout type may also be more complicated.

[0044] In the following description, numerous details are set forth to provide a more thorough explanation of the embodiments of the present invention; however, it is apparent to one skilled in the art that the embodiments of the present invention may be practiced without these specific details.

[0045] See also Figure 1 and Figure 2 , a hydrogen fuel cell vehicle energy control method and system, including obtaining driving path data and the vehicle's current location, and obtaining the limp home mileage between the vehicle's current location and the nearest maintenance station or charging station based on the path data and the vehicle's current location;

[0046] Get the lameness speed and get the lameness time based on the lameness mileage and lameness speed;

[0047] The power required for vehicle limp is calculated based on the limp speed;

[0048] The energy required for lameness is obtained based on the power required for lameness and the lameness time;

[0049] Get the expected shutdown ambient temperature based on the limp time;

[0050] Determine the vehicle's low-temperature cold start requirements based on the expected ambient temperature at shutdown;

[0051] When the vehicle needs to be cold-started at low temperatures, the energy required for cold-starting at low temperatures is calculated based on the expected ambient temperature at shutdown, and the total energy required for limp home operation is calculated based on the energy required for limp home operation and the energy required for cold-starting at low temperatures. When the vehicle does not need to be cold-started at low temperatures, the energy required for limp home operation is the total energy required for limp home operation.

[0052] Control and adjust the throughput of the power battery system according to the total energy required for limp home operation;

[0053] The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system.

[0054] The vehicle's driving path data is input through the navigation system, and the vehicle's operating condition parameters are read. The vehicle's current location is obtained through the positioning device. The limp mileage between the vehicle's current location and the nearest maintenance station or charging station is obtained based on the path data and the vehicle's current location. The limp time is obtained based on the limp mileage and limp speed. The power required for the vehicle's limp mileage is calculated based on the limp speed. The product of the power required for limp mileage and the limp time is the energy required for limp mileage. The weather information after the limp time has passed is queried to obtain the expected ambient temperature at shutdown time, so as to determine whether the vehicle has a low-temperature cold start during the limp mileage to the nearest maintenance station or charging station. If the ambient temperature at shutdown is expected to be below 0°C, the vehicle is judged to have a low-temperature cold start requirement. Otherwise, if there is no low-temperature cold start requirement, the energy consumption caused by low-temperature start due to the ambient temperature factor can be considered to achieve more comprehensive and effective risk avoidance. If the vehicle has a low-temperature cold start requirement, the energy required for low-temperature cold start is obtained by calculating the ambient temperature at shutdown. The sum of the energy required for limp home and the energy required for low-temperature cold start is the total energy required for limp home. If the vehicle does not have a low-temperature cold start requirement, the energy required for limp home is the total energy required for limp home. The throughput of the power battery system is controlled and adjusted according to the total energy required for limp home. Please refer to Figure 2 The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system, which can avoid the risk of vehicle shutdown due to power system failure. The present invention can avoid the risk of vehicle shutdown due to power system failure and reduce the impact and cost caused by towing the vehicle back to a maintenance point or charging station.

[0055] The method for calculating the power required for vehicle limp home according to the limp home speed includes: calculating the power required for limp home according to formula 1,

[0056]

[0057] Among them, v lame is the limp speed, r is the vehicle mechanical transmission efficiency, A is the vehicle frontal area, C d is the air resistance coefficient, F is the rolling resistance coefficient, and G is the weight of the vehicle.

[0058] Combining the vehicle operating condition coefficient and the vehicle limp speed, the power required by the vehicle when limp is calculated, including a set value of the limp speed.

[0059] The method for obtaining the energy required for a low-temperature cold start based on the immediate ambient temperature and the ambient temperature expected at shutdown includes: when the ambient temperature expected at shutdown is lower than 0°C, the temperature required for the system to complete a low-temperature cold start is calculated using Formula 2 based on the ambient temperature expected at shutdown.

[0060] ΔT=|T x |+K, Formula 2,

[0061] Among them, T x is the expected ambient temperature at shutdown, K is the temperature at which the fuel cell system can meet full power or specific power output conditions;

[0062] According to the temperature that needs to rise for the system to complete the low-temperature cold start, the energy required for the low-temperature cold start is calculated by formula 3.

[0063] E cs =C fcs ×m fcs ×ΔT, Formula 3,

[0064] Among them, C fcs is the comprehensive heat capacity of the fuel cell system, m fcs is the total mass of the fuel cell system.

[0065] When the ambient temperature at shutdown is expected to be lower than 0°C, the vehicle is judged to have a need for a low-temperature cold start. Otherwise, there is no need for a low-temperature cold start. Combined with the vehicle's operating condition coefficient, the energy required for a low-temperature cold start is calculated. Taking into account the energy consumption caused by low-temperature starting due to ambient temperature factors, more comprehensive and effective risk avoidance can be carried out.

[0066] The method for controlling and adjusting the throughput of the power battery system according to the total energy required for limp home operation includes: calculating the throughput of the power battery system output adjustment according to the total energy required for limp home operation by formula 4,

[0067] SOC=E 总 / E 动 *100+B, formula 4,

[0068] Among them, E 总 is the total energy required for lameness, E 动 is the total charge of the power battery system, and B is the minimum charge of the power battery system;

[0069] The output of the power battery is adjusted according to the output throughput of the power battery system.

[0070] Based on the percentage of the total energy required for limp home operation to the total charge of the power battery system, combined with the minimum charge of the power battery system, the throughput of the battery system's adjusted output is calculated. The power battery output is then adjusted based on the throughput of the power battery system's adjusted output, effectively preventing the power battery from consuming energy prematurely while the vehicle is limping to a maintenance station or charging station, causing the vehicle to be unable to operate and requiring a tow truck.

[0071] A hydrogen fuel cell vehicle energy control system, a system for executing the hydrogen fuel cell vehicle energy control method described above:

[0072] The module includes a limp time control module: used to obtain driving path data and the vehicle's current location, and obtain the limp mileage between the vehicle's current location and the nearest maintenance station or charging station based on the path data and the vehicle's current location; obtain the limp speed, and obtain the limp time based on the limp mileage and the limp speed;

[0073] Limping energy calculation control module: used to calculate the power required for vehicle limp-ing according to limp-ing speed;

[0074] The energy required for lameness is obtained based on the power required for lameness and the lameness time;

[0075] Get the expected shutdown ambient temperature based on the limp time;

[0076] Determine the vehicle's low-temperature cold start requirements based on the expected ambient temperature at shutdown;

[0077] When the vehicle needs to be cold-started at low temperatures, the energy required for cold-starting at low temperatures is calculated based on the expected ambient temperature at shutdown, and the total energy required for limp home operation is calculated based on the energy required for limp home operation and the energy required for cold-starting at low temperatures. When the vehicle does not need to be cold-started at low temperatures, the energy required for limp home operation is the total energy required for limp home operation.

[0078] Limping energy output adjustment module: used to control and adjust the throughput of the power battery system according to the total energy required for limp driving;

[0079] The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system.

[0080] The limp time control module outputs the limp speed and limp time required for the vehicle to reach the nearest maintenance station or charging station along the limp path based on the route data and the vehicle's current location. The limp energy calculation control module calculates and outputs the total limp energy required for the vehicle to reach the nearest maintenance station or charging station along the limp path based on the limp speed and limp time, taking into account whether the fuel cell needs a low-temperature cold start. The limp energy output adjustment module adjusts the output of the power battery system and the output of the fuel cell system respectively according to the total limp energy required. This can avoid the risk of vehicle shutdown due to power system failure and reduce the impact and cost of towing the vehicle back to a maintenance point or charging station.

[0081] In the above embodiments, although the present invention has been described in conjunction with specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations that fall within the broad scope of the appended claims.

[0082] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A hydrogen fuel cell vehicle energy control method, characterized by: This includes obtaining driving path data and the vehicle's current location, and obtaining the limp mileage between the vehicle's current location and the nearest maintenance station or charging station based on the path data and the vehicle's current location; Get the lameness speed and get the lameness time based on the lameness mileage and lameness speed; The power required for vehicle limp is calculated based on the limp speed; The energy required for lameness is obtained based on the power required for lameness and the lameness time; Get the expected shutdown ambient temperature based on the limp time; Determine the vehicle's low-temperature cold start requirements based on the expected ambient temperature at shutdown; When the vehicle needs to be cold-started at low temperatures, the energy required for cold-starting at low temperatures is calculated based on the expected ambient temperature at shutdown, and the total energy required for limp home operation is calculated based on the energy required for limp home operation and the energy required for cold-starting at low temperatures. When the vehicle does not need to be cold-started at low temperatures, the energy required for limp home operation is the total energy required for limp home operation. Control and adjust the throughput of the power battery system according to the total energy required for limp home operation; The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system.

2. A hydrogen fuel cell vehicle energy control method according to claim 1, characterized in that: The method for calculating the power required for vehicle limp home according to the limp home speed includes: calculating the power required for limp home according to formula 1, Among them, v lame is the limp speed, r is the vehicle mechanical transmission efficiency, A is the vehicle frontal area, C d is the air resistance coefficient, F is the rolling resistance coefficient, and G is the weight of the vehicle.

3. The hydrogen fuel cell vehicle energy control method according to claim 1, characterized in that: The method for obtaining the energy required for a low-temperature cold start based on the immediate ambient temperature and the ambient temperature expected at shutdown includes: when the ambient temperature expected at shutdown is lower than 0°C, the temperature required for the system to complete a low-temperature cold start is calculated using Formula 2 based on the ambient temperature expected at shutdown. ΔT=[T x |+K, Formula 2, Among them, T x is the expected ambient temperature at shutdown, K is the temperature at which the fuel cell system can meet full power or specific power output conditions; According to the temperature that needs to rise for the system to complete the low-temperature cold start, the energy required for the low-temperature cold start is calculated by formula 3. E cs =C fcs ×m fcs ×ΔT, formula 3, Among them, C fcs is the comprehensive heat capacity of the fuel cell system, m fcs is the total mass of the fuel cell system.

4. A hydrogen fuel cell vehicle energy control system, characterized in that: A system for executing a hydrogen fuel cell vehicle energy control method according to any one of claims 1 to 3: The module includes a limp time control module: used to obtain driving path data and the vehicle's current location, and obtain the limp mileage between the vehicle's current location and the nearest maintenance station or charging station based on the path data and the vehicle's current location; obtain the limp speed, and obtain the limp time based on the limp mileage and the limp speed; Limping energy calculation control module: used to calculate the power required for vehicle limp-ing according to limp-ing speed; The energy required for lameness is obtained based on the power required for lameness and the lameness time; Get the expected shutdown ambient temperature based on the limp time; Determine the vehicle's low-temperature cold start requirements based on the expected ambient temperature at shutdown; When the vehicle needs to be cold-started at low temperatures, the energy required for cold-starting at low temperatures is calculated based on the expected ambient temperature at shutdown, and the total energy required for limp home operation is calculated based on the energy required for limp home operation and the energy required for cold-starting at low temperatures. When the vehicle does not need to be cold-started at low temperatures, the energy required for limp home operation is the total energy required for limp home operation. Limping energy output adjustment module: used to control and adjust the throughput of the power battery system according to the total energy required for limp driving; The adjusted output of the fuel cell system is obtained according to the throughput of the power battery system and the output relationship curve between the power battery system and the fuel cell system.

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