A hydrogen fuel automobile hydrogen system starting control method

Abstract

The application discloses a hydrogen fuel automobile hydrogen system starting control method, W1: when the vehicle is running, whether to start the hydrogen fuel system and the required power are judged according to the current battery health condition, the battery discharge rate, the battery temperature and the battery power change in a period of time; W2: the required power is compared with the optimal power of the hydrogen fuel system under the current vehicle state, when the required power is larger, the hydrogen fuel system is started according to the required power; W3: when the required power is smaller, the remaining power is calculated, and the chargeable power of the current battery is compared; W4: when the chargeable power of the battery is larger, the hydrogen fuel system is started according to the optimal starting power; otherwise, the hydrogen fuel system is started according to the required power; W5: when the total battery power rises by an interval or the starting time reaches a time period, whether to start the hydrogen fuel system is re-judged, and W1 is returned; W6: when the condition of closing the hydrogen fuel system is reached, the data of this time is recorded and the method is ended.

Description

Technical Field

[0001] This invention relates to the field of hydrogen system start-up control technology, and specifically to a method for starting up a hydrogen system in a hydrogen fuel cell vehicle. Background Technology

[0002] With the increasing popularity of hydrogen fuel cell vehicles, the battery energy is inevitably lower compared to pure electric vehicles due to space constraints. For vehicles with higher voltage platforms, the battery discharge rate will inevitably increase during high-load operation. Hydrogen fuel cell systems require a certain purging time during shutdowns and cannot be frequently started and stopped. If the hydrogen fuel cell system only considers battery charge as the starting condition, it could result in prolonged battery operation and high-rate discharge, potentially impacting battery life and consequently affecting the vehicle's overall performance. Therefore, the starting conditions for the hydrogen fuel cell system incorporate factors such as battery discharge rate, battery health, and battery temperature. Simultaneously, the optimal power of the hydrogen fuel cell system is compared during startup, and the battery charge is assessed over a certain period. The proportion of each condition is recorded, and the vehicle system is continuously calibrated to achieve the final optimized result, making the hydrogen fuel cell system startup more rational and efficient. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling the start-up of a hydrogen system in a hydrogen fuel cell vehicle, which enables optimized start-up of the hydrogen system in hydrogen fuel cell vehicles.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A method for starting control of a hydrogen fuel cell vehicle's hydrogen system includes the following steps:

[0006] W1: When the vehicle is in motion, based on the current battery health status, battery discharge rate, battery temperature, and changes in battery charge over a period of time, determine whether to activate the hydrogen fuel system and the required power.

[0007] W2: Compare the required power with the optimal power of the hydrogen fuel system under the current vehicle condition. If the required power is greater, start the hydrogen fuel system according to the required power.

[0008] W3: If the required power is small, calculate the remaining power and then compare it with the current battery's rechargeable power;

[0009] W4: If the battery's rechargeable power is high, the hydrogen fuel system will start at the optimal starting power; otherwise, the hydrogen fuel system will start at the required power.

[0010] W5: When the total battery charge increases to a certain level or the startup time reaches a certain period, re-evaluate whether to start the hydrogen fuel system and return to W1;

[0011] W6: The conditions for shutting down the hydrogen fuel system have been met. Record this data and end the process.

[0012] As a further aspect of the present invention: In W1, the battery discharge rate, battery health status, battery temperature, and battery charge change are all fitted in a corresponding proportion to determine the battery SOC value for starting and stopping the hydrogen fuel system.

[0013] The battery SOC value is not fixed and is calculated by the system every 5 minutes.

[0014] As a further aspect of the present invention: the battery discharge rate and battery temperature are the main factors for determining the starting power of the hydrogen system;

[0015] Among them, battery health status and battery charge change are auxiliary addition / deduction items, with the ratio of battery health status to battery charge change being 0.8:1.2.

[0016] As a further aspect of the present invention: In W3, the remaining power is the current required power minus the estimated power consumption.

[0017] As a further aspect of the present invention: the power consumption of the vehicle in the next minute is estimated based on the current driving conditions, and updated every minute.

[0018] As a further aspect of the present invention: In W4, the optimal starting power of hydrogen fuel is determined based on the current hydrogen system temperature and fuel quantity. After the vehicle issues a command to start hydrogen fuel, the hydrogen fuel calculates and achieves the current optimal starting power.

[0019] The calculation is updated every 4 minutes.

[0020] As a further aspect of the present invention: In W5, when returning to W1, the fitting ratio of its power change is increased, and a new round of required power calculation is performed.

[0021] As a further aspect of the present invention: In W6, after the shutdown condition is met, the vehicle shuts off hydrogen fuel cell startup. The vehicle controller records the battery discharge rate, battery health status, battery temperature, and the proportion of changes in charge in the storage space. The proportions recorded five times in a row will be integrated into the startup conditions for the next round.

[0022] The beneficial effects of this invention are as follows: During the operation of a hydrogen fuel cell vehicle, this invention analyzes the current battery discharge rate based on the vehicle's current battery discharge current and the capacity of the high-voltage battery. Simultaneously, considering the battery's health condition and current temperature, the discharge rate is tiered. Finally, the change in battery charge over five minutes is statistically analyzed, and a certain percentage is added based on this statistical change. Ultimately, based on all factors, a determination is made regarding whether to start the hydrogen fuel cell system and the required power for starting. Furthermore, the optimal power of the system is determined based on its operating environment and inherent condition, and a comparison is made between the two. When the optimal power is higher, the current driving conditions of the vehicle are estimated, and the remaining power is calculated. Combined with the battery's rechargeable power, the current starting power of the hydrogen fuel cell system is determined and updated periodically. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] This invention relates to a method for starting and controlling the hydrogen system of a hydrogen fuel cell vehicle, comprising the following steps:

[0028] S1: When the vehicle is in motion, based on the current battery health status, battery discharge rate, battery temperature, and changes in battery charge over a period of time, determine whether to activate the hydrogen fuel system and the required power.

[0029] The battery health status is assessed on a 100-point scale. When the battery health status is above 95%, the battery discharge rate is less than 0.5C, the battery temperature is between 25 and 45 degrees Celsius, and the charge reduction is less than 8% within five minutes, the hydrogen system is started according to the original start-up conditions and power as a basis for good battery condition.

[0030] Under the same battery health condition, if the battery discharge rate increases, the battery temperature is outside the range, or the charge decreases too much, the hydrogen fuel will be activated, and the power will be increased based on the original power level. The increase will be calculated by multiplying the change rate of each factor by a1%.

[0031] S2: Compare the required power with the optimal power of the hydrogen fuel system under the current vehicle condition. If the required power is greater, start the hydrogen fuel system according to the required power.

[0032] The required power is obtained from S1, and the optimal power is determined by the temperature after the hydrogen fuel system is turned on.

[0033] S3: If the required power is small, calculate the remaining power and then compare it with the current rechargeable power of the battery; the remaining power is the difference between the optimal power and the power consumed by the vehicle. First, estimate the power consumed by the vehicle in the next minute of driving, and then subtract it from the optimal power. When making the estimate for the second time, compare the power estimated in the first time with the actual power consumed, and finally correct the second estimate. This process is repeated continuously.

[0034] S4: If the battery has a high rechargeable power, the hydrogen fuel system will start at the optimal power.

[0035] Conversely, the hydrogen fuel system starts at the required power.

[0036] S5: When the total battery charge increases to a certain level or the startup time reaches a certain period, re-determine whether to start the hydrogen fuel system and return to S1;

[0037] The total battery charge level is determined by statistics after the hydrogen fuel is started. If it is less than five minutes, the actual start time is used for judgment. If it is more than five minutes, the change in charge level in the last five minutes is used for judgment. If the battery charge level does not increase, the system returns to S1 and the start power of the hydrogen fuel is increased by b1% proportionally according to the change in charge level.

[0038] S6: The conditions for shutting down the hydrogen fuel system have been met. Record the data and end the process.

[0039] Furthermore, the step mentioned above, multiplying the rate of change of each factor by a1%, refers to the following conditions: the battery discharge rate is less than 0.5C, the battery temperature is between 25 and 45 degrees Celsius, and the charge reduction is no more than 8% within five minutes. If the range of these three conditions is exceeded, the rate of change exceeding the range is calculated and then multiplied by a1%. Based on the original starting conditions and power, the required power is obtained. The upper limit of the required power should not exceed the maximum power of the hydrogen fuel system.

[0040] The above steps mention increasing the starting power of the hydrogen fuel by b1% proportionally to the change in electricity. When the rate of change of each factor is found to be multiplied by a1% and then by b1%, the new required power is calculated based on the original starting power. When it is found that the power exceeds the maximum power of the hydrogen fuel, the original starting conditions are adjusted to advance the start of the hydrogen fuel system. Otherwise, it is not necessary to advance the start.

[0041] The reasoning is the same in the following embodiments.

[0042] Example 2

[0043] A method for starting control of a hydrogen fuel cell vehicle's hydrogen system includes the following steps:

[0044] S1: When the vehicle is in motion, based on the current battery health status, battery discharge rate, battery temperature, and changes in battery charge over a period of time, determine whether to activate the hydrogen fuel system and the required power.

[0045] Battery health status is assessed on a 100-point scale. When the battery health status is between 90% and 95%, the battery discharge rate is less than 0.5C, the battery temperature is between 25 and 45 degrees Celsius, and the charge reduction within five minutes does not exceed 8%, this is considered a good battery condition, and the hydrogen system is started according to the original start-up conditions and power. Under the same battery health status, if the battery discharge rate increases, the battery temperature is outside the range, or the charge reduction is too large, the hydrogen system will be started, and the power will be increased based on the original power level, with the increase calculated by multiplying the change rate of each factor by 'a2%'.

[0046] S2: Compare the required power with the optimal power of the hydrogen fuel system under the current vehicle condition. If the required power is greater, start the hydrogen fuel system according to the required power.

[0047] The required power is obtained in step S1, and the optimal power is determined by the temperature after the hydrogen fuel system is turned on.

[0048] S3: If the required power is small, calculate the remaining power and then compare it with the current rechargeable power of the battery; the remaining power is the difference between the optimal power and the power consumed by the vehicle. First, estimate the power consumed by the vehicle in the next minute of driving, and then subtract it from the optimal power. When making the estimate for the second time, compare the power estimated in the first time with the actual power consumed, and finally correct the second estimate. This process is repeated continuously.

[0049] S4: If the battery's rechargeable power is high, the hydrogen fuel system will start at the optimal power; otherwise, the hydrogen fuel system will start at the required power.

[0050] S5: When the total battery charge increases by a certain range or the start-up time reaches a certain period, re-determine whether to start the hydrogen fuel system and return to S1; whether the total battery charge increases is based on statistics after the hydrogen fuel system is started. If it is less than five minutes, the actual start-up time will be used for judgment. If it is more than five minutes, the change in charge within the last five minutes will be used for judgment. If the battery charge does not increase, return to S1 and increase the start-up power of the hydrogen fuel system by b2% proportionally according to the change in charge.

[0051] S6: The conditions for shutting down the hydrogen fuel system have been met. Record the data and end the process.

[0052] Example 3

[0053] A method for starting control of a hydrogen fuel cell vehicle's hydrogen system includes the following steps:

[0054] S1: When the vehicle is in motion, based on the current battery health status, battery discharge rate, battery temperature, and changes in battery charge over a period of time, determine whether to activate the hydrogen fuel system and the required power.

[0055] Battery health status is assessed on a 100-point scale. When the battery health status is between 80% and 90%, the battery discharge rate is less than 0.5C, the battery temperature is between 25 and 45 degrees Celsius, and the charge reduction within five minutes does not exceed 8%, this is considered a normal battery condition, and the hydrogen system is started according to the original start-up conditions and power. Under the same battery health status, if the battery discharge rate increases, the battery temperature is outside the range, or the charge reduction is too large, the hydrogen system will be started, and the power will be increased based on the original power, with the increase calculated by multiplying the change rate of each factor by a3%.

[0056] S2: Compare the required power with the optimal power of the hydrogen fuel system under the current vehicle condition. If the required power is greater, start the hydrogen fuel system according to the required power. The required power is obtained in S1, and the optimal power is determined by the temperature after the hydrogen fuel system is started.

[0057] S3: If the required power is small, calculate the remaining power and then compare it with the current rechargeable power of the battery; the remaining power is the difference between the optimal power and the power consumed by the vehicle. First, estimate the power consumed by the vehicle in the next minute of driving, and then subtract it from the optimal power. When making the estimate for the second time, compare the power estimated in the first time with the actual power consumed, and finally correct the second estimate. This process is repeated continuously.

[0058] S4: If the battery's rechargeable power is high, the hydrogen fuel system will start at the optimal power; otherwise, the hydrogen fuel system will start at the required power.

[0059] S5: When the total battery charge increases by a certain range or the start-up time reaches a certain period, re-determine whether to start the hydrogen fuel system and return to S1; whether the total battery charge increases is based on statistics after the hydrogen fuel system is started. If it is less than five minutes, the actual start-up time will be used for judgment. If it is more than five minutes, the change in charge within the last five minutes will be used for judgment. If the battery charge does not increase, return to S1 and increase the start-up power of the hydrogen fuel system by b3% proportionally according to the change in charge.

[0060] S6: The conditions for shutting down the hydrogen fuel system have been met. Record the data and end the process.

[0061] Example 4

[0062] A method for starting control of a hydrogen fuel cell vehicle's hydrogen system includes the following steps:

[0063] S1: When the vehicle is in motion, based on the current battery health status, battery discharge rate, battery temperature, and changes in battery charge over a period of time, determine whether to activate the hydrogen fuel system and the required power.

[0064] Battery health status is assessed on a 100-point scale. If the battery health status is below 80%, the battery discharge rate is less than 0.5C, the battery temperature is between 25 and 45 degrees Celsius, and the charge reduction is less than 8% within five minutes, this is considered a poor battery condition, and the hydrogen system will be started according to the original start-up conditions and power. Under the same battery health status, if the battery discharge rate increases, the battery temperature is outside the range, or the charge reduction is too large, the hydrogen system will be started, and the power will be increased based on the original power, with the increase calculated by multiplying the change rate of each factor by 4%.

[0065] S2: Compare the required power with the optimal power of the hydrogen fuel system under the current vehicle condition. If the required power is greater, start the hydrogen fuel system according to the required power. The required power is obtained in S1, and the optimal power is determined by the temperature after the hydrogen fuel system is started.

[0066] S3: If the required power is small, calculate the remaining power and then compare it with the current rechargeable power of the battery; the remaining power is the difference between the optimal power and the power consumed by the vehicle. First, estimate the power consumed by the vehicle in the next minute of driving, and then subtract it from the optimal power. When making the estimate for the second time, compare the power estimated in the first time with the actual power consumed, and finally correct the second estimate. This process is repeated continuously.

[0067] S4: If the battery's rechargeable power is high, the hydrogen fuel system will start at the optimal power; otherwise, the hydrogen fuel system will start at the required power.

[0068] S5: When the total battery charge increases by a certain range or the start-up time reaches a certain period, re-determine whether to start the hydrogen fuel system and return to S1; whether the total battery charge increases is based on statistics after the hydrogen fuel system is started. If it is less than five minutes, the actual start-up time is used for judgment. If it is more than five minutes, the change in charge within the last five minutes is used for judgment. When the battery charge does not increase, return to S1 and increase the start-up power of the hydrogen fuel system by b4% proportionally according to the change in charge.

[0069] S6: The conditions for shutting down the hydrogen fuel system have been met. Record the data and end the process.

[0070] In the examples above, the starting conditions and power of the hydrogen fuel system are different when the battery condition is good, relatively good, average, and poor, and the percentage of factors affecting the rate of change are also different.

[0071] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system, characterized in that, Includes the following steps: W1: When the vehicle is in motion, based on the current battery health status, battery discharge rate, battery temperature, and changes in battery charge over a period of time, determine whether to activate the hydrogen fuel system and the required power. W2: Compare the required power with the optimal power of the hydrogen fuel system under the current vehicle condition. If the required power is greater, start the hydrogen fuel system according to the required power. W3: If the required power is small, calculate the remaining power and then compare it with the current battery's rechargeable power; W4: If the battery's rechargeable power is high, the hydrogen fuel system will start at the optimal starting power; otherwise, the hydrogen fuel system will start at the required power. W5: When the total battery charge increases to a certain level or the startup time reaches a certain period, re-evaluate whether to start the hydrogen fuel system and return to W1; W6: The conditions for shutting down the hydrogen fuel system have been met. Record this data and end the process. In W1, the battery discharge rate, battery health status, battery temperature, and battery charge change are all fitted in a corresponding proportion to determine the battery SOC value for starting and stopping the hydrogen fuel system. In W3, the remaining power is the current required power minus the estimated power consumption; The estimated power consumption is calculated based on the current driving conditions to predict the vehicle's power consumption for the next minute.

2. The method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system according to claim 1, characterized in that, The battery SOC value is not fixed, and the system calculates it every 5 minutes.

3. The method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system according to claim 1, characterized in that, The battery discharge rate and battery temperature are the main factors for determining the starting power of the hydrogen fuel system. Among them, battery health status and battery charge change are auxiliary addition / deduction items, with the ratio of battery health status to battery charge change being 0.8:1.

2.

4. The method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system according to claim 1, characterized in that, The vehicle's power consumption is updated every minute.

5. The method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system according to claim 1, characterized in that, In W4, the optimal starting power of the hydrogen fuel system is determined based on the current temperature and fuel quantity of the hydrogen fuel system. After the vehicle issues a command to start the hydrogen fuel system, the hydrogen fuel system calculates and achieves the current optimal starting power. The calculation is updated every 4 minutes.

6. The method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system according to claim 1, characterized in that, In W5, when returning to W1, the fitting ratio of its power change is increased, and a new round of power calculation is performed.

7. The method for starting control of a hydrogen fuel cell vehicle's hydrogen fuel system according to claim 1, characterized in that, In W6, once the shutdown conditions are met, the vehicle shuts down the hydrogen fuel system and starts up. The vehicle controller records the battery discharge rate, battery health status, battery temperature, and the percentage of changes in charge in the storage space. The percentages recorded five times in a row will be integrated into the conditions for the next round of startup.

Images