KR-20260064028-A - METHOD AND DEVICE FOR CONTROLLING FUEL CELL POWER GENERATION DURING REGENERATIVE BRAKING USING FORWARD DRIVING INFORMATION OF A FUEL CELL VEHICLE

Abstract

The present disclosure relates to a method and apparatus for controlling fuel cell power generation during regenerative braking of a vehicle, and more specifically, includes the steps of: acquiring forward driving information for at least two forward driving sections of a forward driving road of a vehicle; calculating a required fuel cell output value for a current driving section based on the acquired forward driving information for each section; determining whether to perform fuel cell power generation control when the current driving section is a regenerative braking section; and performing fuel cell power generation control even when the current driving section is a regenerative braking section based on the determination.

Inventors

• 장상필

Assignees

• 현대자동차주식회사
• 기아 주식회사

Dates

Publication Date

20260507

Application Date

20241031

Claims (20)

1. A step of acquiring forward driving information for at least two forward driving sections of a forward driving road; A step of calculating the required fuel cell output value of the current driving section based on the forward driving information for each section obtained above; A step of determining whether to perform fuel cell power generation control when the above current driving section is a regenerative braking section; and A method comprising the step of performing fuel cell power generation control based on the above decision, even if the current driving section is a regenerative braking section, Fuel cell power generation control method during vehicle regenerative braking.
2. In paragraph 1, In order to calculate the expected battery output value for each forward driving section based on the above-mentioned forward driving information, the above-mentioned forward driving information is obtained for each of the above-mentioned forward driving sections, which are divided to include at least the current driving section, the first forward driving section, and the second forward driving section. Fuel cell power generation control method during vehicle regenerative braking.
3. In paragraph 1, When the above current driving section is a regenerative braking section, the step of determining whether to perform fuel cell power generation control is: It further includes a step of calculating the expected battery output value and the expected energy required for battery charging and discharging, but, The above estimated battery output value refers to the estimated battery charge/discharge output value, and The estimated energy requirement for battery charging and discharging is determined by multiplying the estimated battery charging and discharging output value and the estimated future driving time, and The required output value for battery charging and discharging is determined by dividing the estimated energy required for charging and discharging by the estimated driving time for the current section. Fuel cell power generation control method during vehicle regenerative braking.
4. In paragraph 3, The method further includes a step of determining the required fuel cell output value for the current driving section by correcting the required vehicle output value for driving to the required battery charge/discharge output value. The fuel cell required output value of the current driving section is determined by adding the vehicle required output value to the battery charge/discharge required output value. Fuel cell power generation control method during vehicle regenerative braking.
5. In paragraph 4, The method further includes the step of determining whether to control fuel cell power generation during regenerative braking by comparing the fuel cell required output value of the current driving section with the fuel cell power generation requirement determination value during regenerative braking. Fuel cell power generation control method during vehicle regenerative braking.
6. In paragraph 5, If it is determined that battery charging is required for the current driving section mentioned above, A step further comprising determining whether to control fuel cell power generation during regenerative braking by comparing the value obtained by subtracting the current motor regenerative braking output value from the battery charge limit value with the battery charge margin determination value during regenerative braking. Fuel cell power generation control method during vehicle regenerative braking.
7. In paragraph 6, If the value obtained by subtracting the current motor regenerative braking output value from the above battery charge limit value is greater, fuel cell power generation control is allowed even during regenerative braking in the current driving section. Fuel cell power generation control method during vehicle regenerative braking
8. In paragraph 5 or 6, If battery charging during regenerative braking of the vehicle in the current driving section is performed above a certain standard, fuel cell power generation control during regenerative braking is not permitted, Fuel cell power generation control method during vehicle regenerative braking.
9. In paragraph 2, When the above-mentioned first forward driving section and the above-mentioned second forward driving section are long uphill sections, The above estimated battery output value shall be the estimated battery discharge output value, but The above battery discharge predicted output value is calculated by multiplying the battery efficiency by the value obtained by subtracting the fuel cell power generation predicted output value from the gradient driving predicted output value during operation, Fuel cell power generation control method during vehicle regenerative braking.
10. In paragraph 2, In the case where the first forward driving section and the second forward driving section are long steel plates, The above estimated battery output value is the estimated battery charge output value, and The above estimated battery charge output value is determined by dividing the estimated gradient driving output value by the battery efficiency, Fuel cell power generation control method during vehicle regenerative braking.
11. In a fuel cell power generation control device of a mobile body that controls a battery output value by utilizing forward driving information, Peripheral device that acquires at least one of the moving object speed limit, gradient status, and gradient data of a road ahead as forward driving information, Memory for storing at least one instruction; and A processor that executes at least one instruction stored in the memory, wherein The above processor is, Based on the forward driving information for each section obtained above, the required fuel cell output value for the current driving section is calculated, and Determining whether to implement fuel cell power generation control based on whether the above current driving section is a regenerative braking section, and Based on the above decision, fuel cell power generation control is performed even if the current driving section is a regenerative braking section, Fuel cell power generation control device during vehicle regenerative braking.
12. In Paragraph 11, In order to calculate the expected battery output value for each forward driving section based on the above-mentioned forward driving information, the above-mentioned forward driving information is obtained for each of the above-mentioned forward driving sections, which are divided to include at least the current driving section, the first forward driving section, and the second forward driving section. Fuel cell power generation control device during vehicle regenerative braking.
13. In Paragraph 11, The above processor determines whether to perform fuel cell power generation control based on whether the current driving section is a regenerative braking section, Calculate the estimated battery output value and the estimated energy required for battery charging and discharging, but, The above estimated battery output value refers to the estimated battery charge/discharge output value, and The estimated energy requirement for battery charging and discharging is determined by multiplying the estimated battery charging and discharging output value and the estimated future driving time, and The required output value for battery charging and discharging is determined by dividing the estimated energy required for charging and discharging by the estimated driving time for the current section. Fuel cell power generation control device during vehicle regenerative braking.
14. In Paragraph 13, The above processor is, The fuel cell required output value for the current driving section is determined by correcting the vehicle required output value for driving to the above battery charge/discharge required output value, The fuel cell required output value of the current driving section is determined by adding the vehicle required output value to the battery charge/discharge required output value. Fuel cell power generation control device during vehicle regenerative braking.
15. In Paragraph 14, The above processor is, Determining whether to control fuel cell power generation during regenerative braking by comparing the fuel cell required output value of the current driving section with the fuel cell power generation requirement determination value during regenerative braking. Fuel cell power generation control device during vehicle regenerative braking.
16. In paragraph 15, The above processor is, If it is determined that battery charging is required for the current driving section mentioned above, Determining whether to control fuel cell power generation during regenerative braking by comparing the value obtained by subtracting the current motor regenerative braking output value from the battery charge limit value with the battery charge margin judgment value during regenerative braking. Fuel cell power generation control device during vehicle regenerative braking.
17. In Paragraph 16, The above processor is, If the value obtained by subtracting the current motor regenerative braking output value from the above battery charge limit value is greater, fuel cell power generation control is allowed even during regenerative braking in the current driving section. Fuel cell power generation control device during vehicle regenerative braking.
18. In paragraph 15 or 16, The above processor is, If battery charging during regenerative braking of the vehicle in the current driving section is performed above a certain standard, fuel cell power generation control during regenerative braking is not permitted, Fuel cell power generation control device during vehicle regenerative braking.
19. In Paragraph 12, When the above-mentioned first forward driving section and the above-mentioned second forward driving section are long uphill sections, The above estimated battery output value shall be the estimated battery discharge output value, but The above battery discharge predicted output value is calculated by multiplying the battery efficiency by the value obtained by subtracting the fuel cell power generation predicted output value from the gradient driving predicted output value during operation, Fuel cell power generation control device during vehicle regenerative braking.
20. In Paragraph 12, In the case where the first forward driving section and the second forward driving section are long steel plates, The above estimated battery output value is the estimated battery charge output value, and The above estimated battery charge output value is determined by dividing the estimated gradient driving output value by the battery efficiency, Fuel cell power generation control device during vehicle regenerative braking.

Description

Method and device for controlling fuel cell power generation during regenerative braking using forward driving information of a fuel cell vehicle The present disclosure relates to a method and apparatus for controlling fuel cell power generation during regenerative braking using forward driving information of a fuel cell vehicle. More specifically, the invention relates to a method and apparatus for controlling fuel cell power generation during regenerative braking to secure battery State of Charge (SOC) prior to uphill driving by considering the vehicle's speed limit, presence of a gradient, and gradient data of the forward driving road obtained from a peripheral device of the vehicle. Generally, a vehicle (also referred to as a 'mobile body') is controlled based on the current state of the mobile body and the current will of the driver. In conventional commercial fuel cell electric vehicles (FCEVs), fuel cell power generation control typically involves calculating the vehicle's required output based on the driver's accelerator pedal input and the output usage of vehicle components, and then determining the FC power generation map according to the high-voltage battery's State of Charge (SOC). Specifically, conventional commercial fuel cell electric vehicles (FCEVs) control fuel cell power generation by calculating the vehicle's required output based on the driver's accelerator pedal input and the output usage of vehicle components, and determining an FC generation map based on the high-voltage battery's State of Charge (SOC). In this case, even if the road ahead involves steep inclines or steep rivers, power is generated solely based on the FC generation map in the current driving section, leading to the problem of being unable to secure sufficient battery SOC for the future driving section. For example, in the case of commercial FCEV vehicles (e.g., FC heavy trucks, FC heavy buses), the high vehicle weight results in high drive motor output consumption during uphill driving, requiring both fuel cell generation output and battery discharge output. If fuel cell generation control is not implemented, the battery output value becomes low during uphill driving; consequently, the battery discharges to its output limit before the climb is completed, causing the vehicle to operate solely on fuel cell generation output, which results in a disadvantage of reduced vehicle speed. In addition, when predicting the expected battery output value required in the forward driving section, an error occurs in which the expected battery output value cannot be calculated accurately because the forward driving section is not divided into at least two sections and the change in elevation of the forward driving section is not taken into account when predicting the expected battery output value. That is, even if battery charging is required in the forward driving section divided into at least two sections, existing FCEV vehicles may not be able to meet the required battery output value for the said forward driving section because fuel cell power generation is limited to a minimum during regenerative braking in the current driving section to ensure the stability of battery charging. Accordingly, there is a need for a method to divide the forward driving section into at least two sections, calculate the expected battery output value required for the future driving section by utilizing information on the forward driving road for each section obtained from the vehicle's peripheral devices, and implement fuel cell power generation control even if the current driving section is a regenerative braking section according to the calculated expected battery output value. FIG. 1 is a block diagram illustrating a configuration module of a vehicle equipped with a fuel cell power generation control device according to an embodiment of the present disclosure. FIGS. 2a and 2b are flowcharts relating to a fuel cell power generation control method according to regenerative braking of a vehicle according to an embodiment of the present disclosure. FIG. 3 is a diagram showing the battery SOC prediction control process of a vehicle for fuel cell power generation control according to an embodiment of the present disclosure, according to the current driving section and at least two forward driving sections. FIG. 4 is a flowchart showing the operation mechanism of a fuel cell power generation control device during regenerative braking to secure battery SOC before uphill driving according to an embodiment of the present disclosure. FIGS. 5a and 5b are drawings showing test data regarding whether fuel cell power generation control is performed during vehicle regenerative braking in the current driving section according to an embodiment of the present disclosure. Hereinafter, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present dis