Calculation method for accumulated equivalent hydrogen consumption and equivalent hydrogen consumption of fuel cell commercial vehicle

Abstract

The invention relates to the technical field of fuel cells, and discloses a fuel cell commercial vehicle accumulated equivalent hydrogen consumption amount and equivalent hydrogen consumption calculation method, which comprises the following steps: acquiring pressure signals of each hydrogen storage tank in a vehicle hydrogen storage system and temperature signals of each hydrogen storage tank in the hydrogen storage system; the average pressure and the average temperature of the vehicle hydrogen storage system are calculated; based on the relationship between the high-pressure hydrogen temperature and pressure and the density, the hydrogen density in the state is obtained, and the mass of hydrogen stored in the vehicle hydrogen storage system is calculated; the SOC change of the power battery is converted into corresponding hydrogen consumption according to the equivalent hydrogen consumption calculation model of the power battery in the running process; and according to the initial hydrogen storage amount and the hydrogen storage amount at the end of the hydrogen storage system in the driving mileage and the equivalent hydrogen consumption amount of the power battery in the process, the hydrogen consumption per hundred kilometers of the whole vehicle is calculated.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a method for calculating the cumulative equivalent hydrogen consumption and equivalent hydrogen consumption of a fuel cell commercial vehicle. Background Art

[0002] Existing fuel cell heavy trucks are all hybrid power systems of power battery + fuel cell engine, and the power battery can be charged by charging piles, so the hydrogen consumption of the fuel cell vehicle needs to consider the equivalent hydrogen consumption of the plug-in charging amount. Since fuel cell vehicles at this stage mainly use high-pressure hydrogen storage, the hydrogen temperature in the hydrogen storage bottle changes dynamically at all times, the hydrogen pressure in the hydrogen bottle also changes at all times, and the hydrogen density in the hydrogen bottle changes at all times. Therefore, the calculation of hydrogen consumption needs to consider the hydrogen pressure and hydrogen temperature in the hydrogen bottle at each time.

[0003] However, at present, the calculation of hydrogen consumption of fuel cell vehicles only considers the hydrogen part, and does not consider the equivalent hydrogen consumption of the charging part. The hydrogen consumption and energy replenishment of the whole vehicle given truly reflects the energy consumption of the whole vehicle.

[0004] Therefore, a method for calculating the cumulative equivalent hydrogen consumption and equivalent hydrogen consumption of a fuel cell commercial vehicle is needed to solve the above problems. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a cumulative equivalent hydrogen consumption of a fuel cell commercial vehicle and a method for calculating the equivalent hydrogen consumption.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for calculating the cumulative equivalent hydrogen consumption and equivalent hydrogen consumption of a fuel cell commercial vehicle, comprising the following steps: A method for calculating the cumulative equivalent hydrogen consumption and equivalent hydrogen consumption of a fuel cell commercial vehicle comprises the following steps: S1: Obtain the current average pressure signal of the vehicle's high-pressure hydrogen storage system, the current average temperature signal of each hydrogen storage bottle in the hydrogen storage system, and the cumulative mileage signal of the vehicle; S2: According to the relationship between the temperature, pressure and density of high-pressure hydrogen, the hydrogen density is obtained and the mass of hydrogen stored in the vehicle hydrogen storage system is calculated; S3: According to the calculation model of equivalent hydrogen consumption of power battery during driving, the change of SOC of power battery is converted into corresponding hydrogen consumption; S4: Calculate the equivalent hydrogen consumption of the vehicle based on the initial and final hydrogen storage amounts of the hydrogen storage system per unit time, as well as the equivalent hydrogen consumption of the power battery during the process; S5: The equivalent hydrogen consumption per 100 kilometers of the vehicle is calculated based on the initial and final hydrogen storage capacities of the hydrogen storage system within the driving mileage, as well as the equivalent hydrogen consumption of the power battery and the driving mileage during the process.

[0007] Preferably, the obtaining of the current average pressure signal of the vehicle high-pressure hydrogen storage system refers to obtaining the pressure signals of each hydrogen storage tank in the vehicle hydrogen storage system, and calculating the average pressure Ppin of each tank group as the current pressure P of the hydrogen storage system: Ppin=(P1+P2+P3+.....+Px) / x.

[0008] Preferably, the current average temperature signal of each hydrogen storage bottle in the hydrogen storage system refers to taking the temperature signal of each hydrogen storage tank in the vehicle hydrogen storage system, and calculating the average temperature Tpin of each bottle group as the current temperature T of the hydrogen storage system: Tpin=(T1+T2+T3+.....+Tx) / x.

[0009] Preferably, the power battery SOC equivalent hydrogen consumption calculation model is: ; Where P n Represents the vehicle's required power, P fc-out Fuel cell output power, represents the fuel cell efficiency, , , Indicates the efficiency of the DC / DC converter, LHV indicates the lower heating value of the fuel cell, LHV=120KJ / g, Indicates the power battery discharge efficiency, Indicates the power battery charging efficiency, and outputs the vehicle equivalent hydrogen consumption m through the power battery SOC equivalent hydrogen consumption calculation model 2 .

[0010] Preferably, the power battery SOC equivalent hydrogen consumption calculation model includes a charging and other hydrogen consumption model when the power battery SOC increases and a discharging and other hydrogen consumption model when the power battery SOC decreases.

[0011] Preferably, the mass of hydrogen stored in the vehicle hydrogen storage system is obtained by the volume V of the hydrogen storage system carried by the fuel cell commercial vehicle, the high-pressure hydrogen temperature T, the hydrogen density ρ obtained by the relationship between the pressure P and the density, and the hydrogen mass m of the current hydrogen storage system is obtained. 1 =ρV; the equivalent hydrogen consumption of the whole vehicle is the hydrogen consumption of the fuel cell m 1 Corresponding to the change of power battery SOC m 2 The sum of equivalent hydrogen consumption, that is, m=m 1 +m 2 .

[0012] Preferably, the mileage is calculated based on the difference between the accumulated mileage at the beginning of a specific driving process and the accumulated mileage of the entire vehicle at the end of the driving process.

[0013] The present invention has the following beneficial effects: charging with an external power source is equivalent to hydrogen consumption, and the influence of hydrogen pressure and hydrogen temperature on hydrogen consumption during the calculation process is eliminated, thereby improving the accuracy of energy consumption calculation of the fuel cell vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the power system of a fuel cell commercial vehicle.

[0015] Figure 2 It is a method flow chart of an embodiment of the present invention.

[0016] Figure 3 It is a calculation model for equivalent hydrogen consumption of a power battery in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] like Figure 1-3 As shown, a method for calculating the cumulative equivalent hydrogen consumption and equivalent hydrogen consumption of a fuel cell commercial vehicle includes the following steps: S1: Obtain the current average pressure signal of the vehicle's high-pressure hydrogen storage system, the current average temperature signal of each hydrogen storage bottle in the hydrogen storage system, and the cumulative mileage signal of the vehicle; S2: The relationship between high-pressure hydrogen temperature, pressure and density is used to obtain the hydrogen density under this state and calculate the mass of hydrogen stored in the vehicle hydrogen storage system; Take the pressure signal of each hydrogen storage tank in the vehicle hydrogen storage system, and calculate the average pressure PPpin of each tank group as the current pressure P of the hydrogen storage system Ppin=(P1+P2+P3+.....+Px) / x Take the temperature signal of each hydrogen storage tank in the vehicle hydrogen storage system, and calculate the average pressure Tpin of each tank group as the current pressure T of the hydrogen storage system. Tpin=(T1+T2+T3+.....+Tx) / x According to the calculation model of equivalent hydrogen consumption of power battery during driving, the change of power battery SOC is converted into corresponding hydrogen consumption; The equivalent hydrogen consumption m of the vehicle is calculated by the initial and final hydrogen storage capacity of the hydrogen storage system per unit time, as well as the equivalent hydrogen consumption of the power battery during the process. 2 ; The equal consumption hydrogen consumption model of power battery SOC change has six inputs, namely power battery discharge efficiency, power battery charging efficiency, power battery SOC, vehicle demand power P n , and the fuel cell output power P fc-out and fuel cell efficiency, the output is the equivalent hydrogen consumption of the vehicle m 2 .

[0019] The calculation model of power battery SOC equivalent hydrogen consumption is: ; Where P n Represents the vehicle's required power, P fc-out Fuel cell output power, represents the fuel cell efficiency, , , Indicates the efficiency of the DC / DC converter, LHV indicates the lower heating value of the fuel cell, LHV=120KJ / g, Indicates the power battery discharge efficiency, Indicates the power battery charging efficiency, and outputs the vehicle equivalent hydrogen consumption m through the power battery SOC equivalent hydrogen consumption calculation model 2 .

[0020] Based on the initial and final hydrogen storage capacities of the hydrogen storage system within the driving range, as well as the equivalent hydrogen consumption of the power battery and the driving range during the process, the equivalent hydrogen consumption per 100 kilometers of the vehicle can be calculated.

[0021] The equal hydrogen consumption model for power battery SOC change includes a charging equal hydrogen consumption model for power battery SOC increase and a discharging equal hydrogen consumption model for power battery SOC decrease.

[0022] According to the volume of the hydrogen storage system carried by the fuel cell commercial vehicle and the hydrogen density ρ obtained according to the relationship between the high-pressure hydrogen temperature T and pressure P and density, the hydrogen mass m of the current hydrogen storage system is calculated. 1 =ρV; hydrogen consumption is the sum of the fuel cell hydrogen consumption and the equivalent hydrogen consumption corresponding to the change in the power battery SOC, that is, m=m 1 +m 2 .

[0023] The vehicle mileage is calculated based on the difference between the accumulated mileage at the beginning and the accumulated mileage at the end of the specific driving process.

[0024] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0025] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for calculating the cumulative equivalent hydrogen consumption and equivalent hydrogen consumption of a fuel cell commercial vehicle, characterized in that: The following steps are involved: S1: Obtain the current average pressure signal of the vehicle's high-pressure hydrogen storage system, the current average temperature signal of each hydrogen storage bottle in the hydrogen storage system, and the cumulative mileage signal of the vehicle; S2: According to the relationship between the temperature, pressure and density of high-pressure hydrogen, the hydrogen density is obtained and the mass of hydrogen stored in the vehicle hydrogen storage system is calculated; S3: According to the calculation model of equivalent hydrogen consumption of power battery during driving, the change of SOC of power battery is converted into corresponding hydrogen consumption; S4: Calculate the equivalent hydrogen consumption of the vehicle based on the initial and final hydrogen storage amounts of the hydrogen storage system per unit time, as well as the equivalent hydrogen consumption of the power battery during the process; S5: The equivalent hydrogen consumption per 100 kilometers of the vehicle is calculated based on the initial and final hydrogen storage capacities of the hydrogen storage system within the driving mileage, as well as the equivalent hydrogen consumption of the power battery and the driving mileage during the process.

2. The cumulative equivalent hydrogen consumption and equivalent hydrogen consumption calculation method of a fuel cell commercial vehicle according to claim 1, characterized in that: The acquisition of the current average pressure signal of the vehicle's high-pressure hydrogen storage system refers to obtaining the pressure signals of each hydrogen storage tank in the vehicle's hydrogen storage system and calculating the average pressure Ppin of each tank group as the current pressure P of the hydrogen storage system: Ppin=(P1+P2+P3+.....+Px) / x.

3. The cumulative equivalent hydrogen consumption and equivalent hydrogen consumption calculation method of a fuel cell commercial vehicle according to claim 1, characterized in that: The current average temperature signal of each hydrogen storage bottle in the hydrogen storage system refers to taking the temperature signal of each hydrogen storage tank in the vehicle hydrogen storage system, and calculating the average temperature Tpin of each bottle group as the current temperature T of the hydrogen storage system: Tpin=(T1+T2+T3+.....+Tx) / x.

4. The cumulative equivalent hydrogen consumption and equivalent hydrogen consumption calculation method of a fuel cell commercial vehicle according to claim 2, characterized in that: The power battery SOC equivalent hydrogen consumption calculation model is: ； Where P n Represents the vehicle's required power, P fc-out Fuel cell output power, represents the fuel cell efficiency, , , Indicates the efficiency of the DC / DC converter, LHV indicates the lower heating value of the fuel cell, LHV=120KJ / g, Indicates the power battery discharge efficiency, It represents the power battery charging efficiency, and outputs the vehicle equivalent hydrogen consumption m2 through the power battery SOC equivalent hydrogen consumption calculation model.

5. The cumulative equivalent hydrogen consumption and equivalent hydrogen consumption calculation method of a fuel cell commercial vehicle according to claim 4, characterized in that: The power battery SOC equivalent hydrogen consumption calculation model includes a charging and other hydrogen consumption model when the power battery SOC increases and a discharging and other hydrogen consumption model when the power battery SOC decreases.

6. The cumulative equivalent hydrogen consumption and equivalent hydrogen consumption calculation method of a fuel cell commercial vehicle according to claim 1, characterized in that: The mass of hydrogen stored in the vehicle hydrogen storage system is obtained by the volume V of the hydrogen storage system carried by the fuel cell commercial vehicle, the high-pressure hydrogen temperature T, the hydrogen density ρ obtained by the pressure P and the density, and the hydrogen mass m1=ρV of the current hydrogen storage system; the equivalent hydrogen consumption of the whole vehicle is the sum of the hydrogen consumption m1 of the fuel cell and the equivalent hydrogen consumption m2 corresponding to the SOC change of the power battery, that is, m=m1+m2.

7. The cumulative equivalent hydrogen consumption and equivalent hydrogen consumption calculation method of a fuel cell commercial vehicle according to claim 1, characterized in that: The mileage is calculated based on the difference between the accumulated mileage at the beginning of a specific driving process and the accumulated mileage of the vehicle at the end of the driving process.

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