A method for calculating the driving range of hydrogen fuel cell vehicles

Abstract

This invention relates to a method for calculating the driving range of a hydrogen fuel cell vehicle, comprising the following steps: obtaining the current hydrogen SOC and the current power battery SOC of the hydrogen fuel cell vehicle; calculating the current equivalent SOC based on the current hydrogen SOC and the current power battery SOC; obtaining the historical energy consumption of the main drive motor and auxiliary drive system components of the hydrogen fuel cell vehicle; calculating the driving range value based on the current equivalent SOC and the historical energy consumption of the main drive motor and auxiliary drive system components; and performing interval filtering on the driving range value to obtain the driving range output value. This invention can accurately calculate the driving range of a hydrogen fuel cell vehicle, improving the calculation accuracy.

Description

Technical Field

[0001] This invention relates to the field of hydrogen fuel cell vehicle technology, and in particular to a method for calculating the driving range of a hydrogen fuel cell vehicle. Background Technology

[0002] Currently, the driving range of hydrogen fuel cells is generally calculated using the ratio of remaining hydrogen mass to average hydrogen consumption. This method suffers from low accuracy and cannot dynamically adapt to actual operating conditions. Summary of the Invention

[0003] The purpose of this invention is to provide a method for calculating the driving range of hydrogen fuel cell vehicles, addressing the shortcomings of existing technologies.

[0004] This invention is achieved using the following technical solution:

[0005] A method for calculating the driving range of a hydrogen fuel cell vehicle includes the following steps:

[0006] Obtain the current hydrogen SOC and current power battery SOC of the hydrogen fuel cell vehicle, and calculate the current equivalent SOC based on the current hydrogen SOC and current power battery SOC;

[0007] Obtain the historical energy consumption of the main drive motor and auxiliary drive system components of hydrogen fuel cell vehicles;

[0008] The driving range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and auxiliary drive system components.

[0009] The calculated driving range is filtered by interval to obtain the driving range output value.

[0010] As a further explanation of the invention, the current hydrogen SOC and current power battery SOC of the hydrogen fuel cell vehicle are obtained, and the current equivalent SOC is calculated based on the current hydrogen SOC and current power battery SOC; the calculation formula is as follows:

[0011] H 2SOC =(Prest n *γ*δ) / TB 动力电池总电量

[0012] Among them, H 2SOC Indicates the current state of charge (SOC) of hydrogen, Prestor n γ represents the residual hydrogen pressure, δ represents the hydrogen physical property value, and TB represents the energy conversion coefficient. 动力电池总电量 Indicates the total capacity of the power battery;

[0013] E SOC =H 2SOC +PB SOC

[0014] Among them, E SOC Indicates the current equivalent SOC, PB SOC This indicates the current SOC of the power battery.

[0015] As a further explanation of the invention, the historical energy consumption of the main drive motor and auxiliary drive system components of the hydrogen fuel cell vehicle is obtained, including:

[0016] Set the unit kilometer marker and usage time, and calculate the energy consumption of the main drive motor and auxiliary drive system components within the unit kilometer; the auxiliary drive system components include: steering system, braking system, DC-DC converter, air conditioning, and heater; the calculation formula is:

[0017] E m =(U B *I B +P OUT -P AM )*T

[0018] Among them, E m U represents the energy consumption of the main drive motor. B Indicates the main drive motor battery voltage, I B P represents the main drive motor battery current. OUT P represents the actual net output power of the fuel cell stack. AM The power of the auxiliary drive system components is represented by T, and the time taken to travel one unit of kilometers is represented by T.

[0019] E am =(U EHDS *I EHDS / 1000+U EHBS *I EHBS / 1000+U DCDC *I DCDC / 1000+P AC +P PTC )*T

[0020] Among them, E am U represents the energy consumption of the auxiliary drive system components. EHDS I represents the voltage of the steering motor bus. EHDS U represents the bus current of the steering motor. EHBS I represents the bus voltage of the brake and air compressor motor. EHBS U represents the bus current of the brake air compressor motor. DCDC I represents the input voltage of the DC-DC converter. DCDC P represents the input current of the DC-DC converter. AC P represents the power of the air conditioner. PTC This indicates the heater power.

[0021] As a further explanation of the invention, the power of the main drive motor and the energy consumption of the auxiliary drive system components are accumulated over a certain number of kilometers, and the average energy consumption of the main drive motor, the average energy consumption of the auxiliary drive system components, and the proportion of the average energy consumption of the main drive motor per unit kilometer are calculated; the calculation formula is as follows:

[0022]

[0023]

[0024] ε=Av_E m / (Av_E m +Av_E am )

[0025] Among them, Av_E m Av_E represents the average energy consumption of the main drive motor. am ε represents the average energy consumption of the auxiliary drive system components, ε represents the proportion of the average energy consumption of the main drive motor, and N represents the number of kilometers.

[0026] As a further explanation of the invention, the driving range is calculated based on the historical energy consumption of the current equivalent SOC, main drive motor, and auxiliary drive system components; the calculation formula is as follows:

[0027] E DMA =E SOC *ε

[0028] Among them, E DMA Indicates the available energy of the main drive motor;

[0029] S cal =E DMA / E DMC

[0030] Among them, S cal E represents the calculated driving range. DMC This indicates the average energy consumption of the main drive motor.

[0031] As a further explanation of the invention, the calculated driving range value is subjected to interval filtering to obtain the driving range output value; including:

[0032] Set the upper limit of the interval filtering to N1 and the lower limit of the interval filtering to N2; set the unit kilometer flag and usage time, and delay the calculated range value by one period; the calculation formula is:

[0033] When Cur_S cal -Pre_S cal When S > N1, out =min(Cur_S cal Pre_S cal +N1);

[0034] When Pre_S cal -Cur_S cal When S > N2, out =max(Cur_S cal Pre_S cal -N2); where Cur_S cal Pre_S represents the calculated range for the current period. cal This represents the calculated range for the previous cycle, S. out This indicates the output value for driving range.

[0035] Compared with the prior art, the present invention has the following beneficial technical effects:

[0036] This invention takes into account equivalent energy and combines the energy consumption distribution of the main drive motor and auxiliary drive system components during the historical driving process of hydrogen fuel cell vehicles. At the same time, it introduces interval filtering, which can accurately calculate the driving range of hydrogen fuel cell vehicles and improve the calculation accuracy. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the method for calculating the driving range of a hydrogen fuel cell vehicle according to the present invention. Detailed Implementation

[0038] like Figure 1 As shown, a method for calculating the driving range of a hydrogen fuel cell vehicle includes the following steps:

[0039] Obtain the current hydrogen SOC and current power battery SOC of the hydrogen fuel cell vehicle, and calculate the current equivalent SOC based on the current hydrogen SOC and current power battery SOC;

[0040] Obtain the historical energy consumption of the main drive motor and auxiliary drive system components of hydrogen fuel cell vehicles;

[0041] The driving range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and auxiliary drive system components.

[0042] The calculated driving range is filtered by interval to obtain the driving range output value.

[0043] Furthermore, the current hydrogen SOC and current battery SOC of the hydrogen fuel cell vehicle are obtained, and the current equivalent SOC is calculated based on the current hydrogen SOC and current battery SOC; the calculation formula is as follows:

[0044] H 2SOC =(Prest n *γ*δ) / TB 动力电池总电量

[0045] Among them, H 2SOCIndicates the current state of charge (SOC) of hydrogen, Prestor n γ represents the residual hydrogen pressure, δ represents the hydrogen physical property value, and TB represents the energy conversion coefficient. 动力电池总电量 This indicates the total charge of the power battery; preferably, the hydrogen physical property value is the product of the total volume of the hydrogen cylinder and the current remaining actual hydrogen density; the total volume of the hydrogen cylinder and the remaining hydrogen pressure can be obtained from the vehicle bus message, and the remaining hydrogen density can be obtained by looking up the hydrogen physical property map table according to the remaining hydrogen pressure, and then subtracting the hydrogen density corresponding to the 2 MPa boundary pressure, which is 2.517 kg / m³. 3 The current remaining actual hydrogen density is obtained, and the energy conversion coefficient is usually 1.43*10^8.

[0046] E SOC =H 2SOC +PB SOC

[0047] Among them, E SOC Indicates the current equivalent SOC, PB SOC This indicates the current SOC of the power battery. Furthermore, the current SOC of the power battery can be obtained from vehicle bus messages.

[0048] Furthermore, the historical energy consumption of the main drive motor and auxiliary drive system components of the hydrogen fuel cell vehicle will be obtained, including:

[0049] Set the unit kilometer marker and usage time, and calculate the energy consumption of the main drive motor and auxiliary drive system components within the unit kilometer; the auxiliary drive system components include: steering system, braking system, DC-DC converter, air conditioning, and heater; the calculation formula is:

[0050] E m =(U B *I B +P OUT -P AM )*T

[0051] Among them, E m U represents the energy consumption of the main drive motor. B Indicates the main drive motor battery voltage, I B P represents the main drive motor battery current. OUT P represents the actual net output power of the fuel cell stack. AM The power of the auxiliary drive system components is represented by T, which represents the time taken to travel one kilometer; preferably, the unit kilometer is one kilometer.

[0052] E am =(U EHDS *I EHDS / 1000+U EHBS *I EHBS / 1000+U DCDC *IDCDC / 1000+P AC +P PTC )*T

[0053] Among them, E am U represents the energy consumption of the auxiliary drive system components. EHDS I represents the voltage of the steering motor bus. EHDS U represents the bus current of the steering motor. EHBS I represents the bus voltage of the brake and air compressor motor. EHBS U represents the bus current of the brake air compressor motor. DCDC I represents the input voltage of the DC-DC converter. DCDC P represents the input current of the DC-DC converter. AC P represents the power of the air conditioner. PTC This indicates the heater power.

[0054] Furthermore, by accumulating the power of the main drive motor and the energy consumption of the auxiliary drive system components over a certain distance, the average energy consumption of the main drive motor, the average energy consumption of the auxiliary drive system components, and the proportion of the average energy consumption of the main drive motor per unit kilometer are calculated; the calculation formula is:

[0055]

[0056]

[0057] ε=Av_E m / (Av_E m +Av_E am )

[0058] Among them, Av_E m Av_E represents the average energy consumption of the main drive motor. am ε represents the average energy consumption of the auxiliary drive system components, ε represents the proportion of the average energy consumption of the main drive motor, and N represents the number of kilometers.

[0059] Furthermore, the driving range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and auxiliary drive system components; the calculation formula is:

[0060] E DMA =E SOC *ε

[0061] Among them, E DMA Indicates the available energy of the main drive motor;

[0062] S cal =E DMA / E DMC

[0063] Among them, S cal E represents the calculated driving range.DMC This represents the average energy consumption of the main drive motor, i.e., E. DMC That is, Av_E m .

[0064] Furthermore, to address the issue of abrupt changes in the calculated driving range, interval filtering is applied to the calculated driving range value to obtain the output driving range value; including:

[0065] Set the upper limit of the interval filtering to N1 and the lower limit of the interval filtering to N2; set the unit kilometer flag and usage time, and delay the calculated range value by one period; the calculation formula is:

[0066] When Cur_S cal -Pre_S cal When S > N1, out =min(Cur_S cal Pre_S cal +N1);

[0067] When Pre_S cal -Cur_S cal When S > N2, out =max(Cur_S cal Pre_S cal -N2); where Cur_S cal Pre_S represents the calculated range for the current period. cal This represents the calculated range for the previous cycle, S. out This indicates the output value for driving range.

Claims

1. A hydrogen fuel cell vehicle range calculation method, characterized by, The method comprises the following steps: Obtain the current hydrogen SOC and the current power battery SOC of the hydrogen fuel cell vehicle, and calculate the current equivalent SOC according to the current hydrogen SOC and the current power battery SOC; Obtain the historical energy consumption of the main drive motor and auxiliary drive system components of the hydrogen fuel cell vehicle; Calculate the calculated value of the cruising range according to the current equivalent SOC and the historical energy consumption of the main drive motor and auxiliary drive system components; Interval filtering is performed on the calculated value of the cruising range to obtain the output value of the cruising range; Obtain the current hydrogen SOC and the current power battery SOC of the hydrogen fuel cell vehicle, and calculate the current equivalent SOC according to the current hydrogen SOC and the current power battery SOC; the calculation formula is: H 2SOC = (Prest n * γ * δ) / TB 动力电池总电量 wherein H 2SOC represents the current hydrogen SOC, Prest n represents the remaining hydrogen pressure, γ represents a hydrogen property value, δ represents an energy conversion coefficient, TB 动力电池总电量 represents the total power battery capacity; E SOC = H 2SOC + PB SOC wherein E SOC represents the current equivalent SOC, PB SOC represents the current power battery SOC; Obtain the historical energy consumption of the main drive motor and auxiliary drive system components of the hydrogen fuel cell vehicle, including: Set the unit kilometer flag and the use time, and calculate the energy consumption of the main drive motor and auxiliary drive system components within the unit kilometer; wherein the auxiliary drive system components include: steering system, braking system, DC-DC converter, air conditioner, heater; the calculation formula is: E m = (U B * I B + P OUT - P AM ) * T Wherein, E m represents the energy consumption of the main drive motor, U B represents the main drive motor battery voltage, I B represents the main drive motor battery current, P OUT represents the actual output net power of the fuel cell stack, P AM represents the auxiliary drive system component power, T represents the time used for driving per kilometer; E am = (U EHDS * I EHDS / 1000 + U EHBS * I EHBS / 1000 + U DCDC * I DCDC / 1000 + P AC + P PTC ) * T where E am represents energy consumption of the auxiliary drive system components, U EHDS represents the steering motor bus voltage, I EHDS represents the steering motor bus current, U EHBS represents the brake compressor motor bus voltage, I EHBS represents the brake compressor motor bus current, U DCDC represents the DC-DC converter input voltage, I DCDC represents the DC-DC converter input current, P AC represents the air conditioning power, P PTC represents the heater power; Cumulatively calculate the power of the main drive motor and the energy consumption of the auxiliary drive system components within a certain number of kilometers, and calculate the average energy consumption of the main drive motor, the average energy consumption of the auxiliary drive system components, and the average energy consumption ratio of the main drive motor; the calculation formula is: ε = Av_E m / (Av_E m +Av_E am ) Wherein, Av_E m represents the average energy consumption of the main drive motor, Av_E am represents the average energy consumption of the auxiliary drive system components, ε represents the proportion of the average energy consumption of the main drive motor, and N represents a number of kilometers. Calculate the calculated value of the cruising range according to the current equivalent SOC and the historical energy consumption of the main drive motor and auxiliary drive system components; the calculation formula is: E DMA = E SOC * ε wherein E DMA represents the available energy of the main drive motor; S cal = E DMA / E DMC wherein S cal represents the calculated value of the range, E DMC represents the average energy consumption of the main drive motor; i.e. E DMC is Av_E m ; Interval filtering is performed on the calculated value of the cruising range to obtain the output value of the cruising range; including: Set the upper limit of interval filtering as N1 and the lower limit of interval filtering as N2; set the unit kilometer flag and the use time, and delay the calculated value of the cruising range for one period; the calculation formula is: When Cur_S cal - Pre_S cal > N1, S out = min(Cur_S cal , Pre_S cal + N1); When Pre_S cal - Cur_S cal > N2, S out = max(Cur_S cal , Pre_S cal - N2); wherein Cur_S cal represents the cruising range calculation value in the current cycle, Pre_S cal represents the cruising range calculation value in the previous cycle, S out represents the cruising range output value.

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