Method for calculating endurance mileage of hydrogen fuel cell automobile

Abstract

The invention relates to a method for calculating the endurance mileage of a hydrogen fuel cell vehicle, which comprises the following steps: acquiring the current hydrogen SOC and the current power battery SOC of the hydrogen fuel cell vehicle, and calculating the current equivalent SOC according to the current hydrogen SOC and the current power battery SOC; historical energy consumption of a main drive motor and an auxiliary drive system component of the hydrogen fuel cell vehicle is obtained; calculating an endurance mileage calculation value according to the current equivalent SOC, the historical energy consumption of the main drive motor and the historical energy consumption of the auxiliary drive system component; performing interval filtering on the endurance mileage calculation value to obtain an endurance mileage output value; according to the method, the endurance mileage of the hydrogen fuel cell vehicle can be accurately calculated, and the calculation precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cell vehicles, and in particular to a method for calculating the cruising range of a hydrogen fuel cell vehicle. Background Art

[0002] The current calculation of hydrogen fuel cell cruising range generally uses the ratio of the remaining hydrogen mass to the average hydrogen consumption as the cruising range calculation value. This method has the problems of low accuracy and inability to dynamically adapt to actual working conditions. Summary of the invention

[0003] The purpose of the present invention is to provide a method for calculating the cruising range of a hydrogen fuel cell vehicle in view of the deficiencies in the prior art.

[0004] The present invention is achieved by adopting the following technical solutions:

[0005] A method for calculating the cruising range of a hydrogen fuel cell vehicle comprises 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 cruising range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and the auxiliary drive system components;

[0009] Perform interval filtering on the calculated value of the cruising range to obtain the output value of the cruising range.

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

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

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

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

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

[0015] As a further illustration 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 mark 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 conditioner, heater; the calculation formula is:

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

[0018] Among them, E m Indicates the energy consumption of the main drive motor, U B Indicates the main drive motor battery voltage, I B Indicates the main drive motor battery current, P OUT Indicates the actual net output power of the fuel cell stack, P AM It represents the power of auxiliary drive system components, and T represents the time taken to travel a unit kilometer;

[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 Indicates the energy consumption of auxiliary drive system components, U EHDS Indicates the steering motor bus voltage, I EHDS Indicates the steering motor bus current, U EHBS Indicates the bus voltage of the brake pump motor, I EHBS Indicates the bus current of the brake pump motor, U DCDC Indicates the DC-DC converter input voltage, I DCDC represents the DC-DC converter input current, P AC Indicates air conditioning power, P PTC 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 within a certain number of kilometers are accumulated, and 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 within a unit kilometer are calculated; the calculation formula is:

[0022]

[0023]

[0024] ε=Av_E m / (Av_E m +Av_E am )

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

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

[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 Indicates the calculated value of cruising range, E DMC Indicates the average energy consumption of the main drive motor.

[0031] As a further explanation of the invention, the range calculation value is interval filtered to obtain the range output value; including:

[0032] Set the interval filter upper limit to N1 and the interval filter lower limit to N2; set the unit kilometer mark and usage time, and delay the cruising range calculation value for one cycle; the calculation formula is:

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

[0034] When Pre_S cal -Cur_S cal >N2, S out =max(Cur_S cal , Pre_S cal -N2); where Cur_S cal Indicates the calculated value of the cruising range in the current cycle, Pre_S cal Indicates the calculated value of the cruising range in the previous cycle, S out Indicates the output value of the cruising range.

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

[0036] The present 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 of hydrogen fuel cell vehicles. At the same time, interval filtering is introduced to accurately calculate the cruising range of hydrogen fuel cell vehicles and improve the calculation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic flow chart of a method for calculating the cruising range of a hydrogen fuel cell vehicle of the present invention. DETAILED DESCRIPTION

[0038] like Figure 1 As shown, a method for calculating the cruising range of a hydrogen fuel cell vehicle comprises 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 cruising range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and the auxiliary drive system components;

[0042] Perform interval filtering on the calculated value of the cruising range to obtain the output value of the cruising range.

[0043] Furthermore, the current hydrogen SOC and the current power battery SOC of the hydrogen fuel cell vehicle are obtained, and the current equivalent SOC is calculated according to the current hydrogen SOC and the current power battery SOC; the calculation formula is:

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

[0045] Among them, H 2SOCIndicates the current hydrogen SOC, Prest n represents the residual hydrogen pressure, γ represents the hydrogen physical property value, δ represents the energy conversion coefficient, TB 动力电池总电量 Indicates the total power 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 checking the hydrogen physical property map table according to the remaining hydrogen pressure, and then the corresponding hydrogen density is 2.517kg / m minus the 2Mpa boundary pressure. 3 , get the current remaining actual hydrogen density, 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 Indicates the current power battery SOC. Further, the current power battery SOC can be obtained from the vehicle bus message.

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

[0049] Set the unit kilometer mark 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 conditioner, heater; the calculation formula is:

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

[0051] Among them, E m Indicates the energy consumption of the main drive motor, U B Indicates the main drive motor battery voltage, I B Indicates the main drive motor battery current, P OUT Indicates the actual net output power of the fuel cell stack, P AM represents the power of the auxiliary drive system components, T represents the time taken to travel a unit 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 Indicates the energy consumption of auxiliary drive system components, U EHDS Indicates the steering motor bus voltage, I EHDS Indicates the steering motor bus current, U EHBS Indicates the bus voltage of the brake pump motor, I EHBS Indicates the busbar current of the brake pump motor, U DCDC Indicates the DC-DC converter input voltage, I DCDC represents the DC-DC converter input current, P AC Indicates air conditioning power, P PTC Indicates the heater power.

[0054] Furthermore, the power of the main drive motor and the energy consumption of the auxiliary drive system components within a certain number of kilometers are accumulated, and 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 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 Indicates the average energy consumption of the main drive motor, Av_E am It represents the average energy consumption of auxiliary drive system components, ε represents the average energy consumption percentage of the main drive motor, and N represents a number of kilometers.

[0059] Furthermore, the cruising range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and the 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 Indicates the calculated value of cruising range, EDMC Indicates the average energy consumption of the main drive motor. DMC That is Av_E m .

[0064] Furthermore, in order to solve the problem of the range calculation jump, the range calculation value is interval filtered to obtain the range output value; including:

[0065] Set the interval filter upper limit to N1 and the interval filter lower limit to N2; set the unit kilometer mark and usage time, and delay the cruising range calculation value for one cycle; the calculation formula is:

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

[0067] When Pre_S cal -Cur_S cal >N2, S out =max(Cur_S cal , Pre_S cal -N2); where Cur_S cal Indicates the calculated value of the cruising range in the current cycle, Pre_S cal Indicates the calculated value of the cruising range in the previous cycle, S out Indicates the output value of the cruising range.

Claims

1. A method for calculating the cruising range of a hydrogen fuel cell vehicle, characterized in that: The following steps are involved: 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; Obtain the historical energy consumption of the main drive motor and auxiliary drive system components of hydrogen fuel cell vehicles; The cruising range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and the auxiliary drive system components; Perform interval filtering on the calculated value of the cruising range to obtain the output value of the cruising range.

2. The method for calculating the cruising range of a hydrogen fuel cell vehicle according to claim 1, characterized in that: 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; the calculation formula is: H 2SOC =(Prest n *c*d) / TB 动力电池总电量 Among them, H 2SOC Indicates the current hydrogen SOC, Prest n represents the residual hydrogen pressure, γ represents the hydrogen physical property value, δ represents the energy conversion coefficient, TB 动力电池总电量 Indicates the total power of the power battery; E SOC =H 2SOC +PB SOC Among them, E SOC Indicates the current equivalent SOC, PB SOC Indicates the current power battery SOC.

3. The method for calculating the cruising range of a hydrogen fuel cell vehicle as claimed in claim 2, characterized in that: Obtain the historical energy consumption of the main drive motor and auxiliary drive system components of hydrogen fuel cell vehicles, including: Set the unit kilometer mark 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 conditioner, heater; the calculation formula is: E m =(U B *I B +P OUT -P AM )*T Among them, E m Indicates the energy consumption of the main drive motor, U B Indicates the main drive motor battery voltage, I B Indicates the main drive motor battery current, P OUT Indicates the actual net output power of the fuel cell stack, P AM It represents the power of auxiliary drive system components, and T represents the time taken to travel a unit kilometer; E am =(U EHDS *I EHDS / 1000+U EHBS *I EHBS / 1000+U DCDC *I DCDC / 1000+P AC +P PTC )*T Among them, E am Indicates the energy consumption of auxiliary drive system components, U EHDS Indicates the steering motor bus voltage, I EHDS Indicates the steering motor bus current, U EHBS Indicates the bus voltage of the brake pump motor, I EHBS Indicates the bus current of the brake pump motor, U DCDC Indicates the DC-DC converter input voltage, I DCDC represents the DC-DC converter input current, P AC Indicates air conditioning power, P PTC Indicates the heater power.

4. The method for calculating the cruising range of a hydrogen fuel cell vehicle as claimed in claim 3, characterized in that: Accumulate 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 per unit kilometer; the calculation formula is: ε=Av_E m / (Off_E m +Off_E am ) Among them, Av_E m Indicates the average energy consumption of the main drive motor, Av_E am It represents the average energy consumption of auxiliary drive system components, ε represents the average energy consumption percentage of the main drive motor, and N represents a number of kilometers.

5. The method for calculating the cruising range of a hydrogen fuel cell vehicle as claimed in claim 4, characterized in that: The cruising range is calculated based on the current equivalent SOC, the historical energy consumption of the main drive motor and the auxiliary drive system components; the calculation formula is: AND DMA =And SOC *e Among them, E DMA Indicates the available energy of the main drive motor; S cal =E DMA / E DMC Among them, S cal Indicates the calculated value of cruising range, E DMC Indicates the average energy consumption of the main drive motor.

6. The method for calculating the cruising range of a hydrogen fuel cell vehicle as claimed in claim 5, characterized in that: Perform interval filtering on the calculated value of the cruising range to obtain the output value of the cruising range; including: Set the interval filter upper limit to N1 and the interval filter lower limit to N2; set the unit kilometer mark and usage time, and delay the cruising range calculation value for one cycle; 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); Among them, Cur_S cal Indicates the calculated value of the cruising range in the current cycle, Pre_S cal Indicates the calculated value of the cruising range in the previous cycle, S out Indicates the output value of the cruising range.

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