阅读说明：本技术 燃料电池客车的燃料电池系统工作功率的控制方法及系统 (Method and system for controlling working power of fuel cell system of fuel cell passenger car ) 是由 黄兴 郑丽萍 文江涛 蔡志锐 于 2021-05-25 设计创作，主要内容包括：本发明提供一种燃料电池客车的燃料电池系统工作功率的控制方法及系统,其基于控制参数值制定生成燃料电池系统状态切换策略；实时采集车辆的各项数据,根据车辆的各项数据计算控制参数值,根据计算结果判断是否满足状态切换条件；在计算结果满足任一状态切换条件时,控制燃料电池系统进行相应状态切换；通过综合考虑车辆的能耗需求与燃料电池系统的工作效率制定出燃料电池系统状态切换策略,从而能够基于车辆实际能量需求来控制燃料电池系统的工作功率,使燃料电池系统在工作时能够基于车辆当前能量需求状态处于相对高效功率区工作,避免不同功率切换及频繁启停,提高氢燃料的转换效率,且延长了燃料电池系统的工作寿命。(The invention provides a method and a system for controlling the working power of a fuel cell system of a fuel cell passenger car, which formulate and generate a state switching strategy of the fuel cell system based on a control parameter value; collecting various data of the vehicle in real time, calculating a control parameter value according to the various data of the vehicle, and judging whether a state switching condition is met according to a calculation result; when the calculation result meets any state switching condition, controlling the fuel cell system to perform corresponding state switching; the fuel cell system state switching strategy is worked out by comprehensively considering the energy consumption requirement of the vehicle and the working efficiency of the fuel cell system, so that the working power of the fuel cell system can be controlled based on the actual energy requirement of the vehicle, the fuel cell system can work in a relatively high-efficiency power area based on the current energy requirement state of the vehicle during working, different power switching and frequent starting and stopping are avoided, the conversion efficiency of hydrogen fuel is improved, and the working life of the fuel cell system is prolonged.)

1. A method for controlling the operating power of a fuel cell system of a fuel cell passenger vehicle, comprising the steps of:

based on the integrated operation value of the total current of the cell after the fuel cell system enters each state and the latest 30-second integrated operation value C _uof the total current of the cell after the fuel cell system enters each state_30sSOC value of batteryCharging power P bearable under current state of battery_cMaking and generating a fuel cell system state switching strategy by using the four control parameter values;

various data of the vehicle are collected in real time, the integral calculation value of the total current of the battery after the fuel cell system enters each state is calculated according to the various data of the vehicle, and the latest 30-second integral calculation value C \uof the total current of the battery after the fuel cell system enters each state is calculated_30sSOC value of battery, and charging power P bearable under current state of battery_cJudging whether the state switching condition is met or not according to the calculation result;

and when the calculation result meets any state switching condition, controlling the fuel cell system to perform corresponding state switching.

2. The method for controlling the operating power of the fuel cell system of the fuel cell passenger vehicle according to claim 1, wherein the method for making the fuel cell system state switching strategy includes the steps of:

setting various working states of the fuel cell system;

based on the integrated operation value of the total current of the cell after the fuel cell system enters each state and the latest 30-second integrated operation value C _uof the total current of the cell after the fuel cell system enters each state_30sSOC value of battery, and charging power P bearable under current state of battery_cSetting a plurality of state switching conditions;

each state switching condition is set to correspond to an operation state switching action of the fuel cell system.

3. The method of controlling the operating power of the fuel cell system of the fuel cell passenger vehicle according to claim 1, wherein the state switching condition is as follows:

state switching condition 1 expression:

(C__all<-0.05C_r) And (C \u)_30s<0) And (SOC)>85%) and (P)₁≤P_c)；

State switching condition 2 expression:

(C__all>0.05C_r) And (C \u)_30s>0) And (SOC)<80%) and (P)₂≤P_c)；

State switching condition 3 expression:

(C__all<-0.4C_r) And (C \u)_30s<0) And (SOC)>80%) and (P)₂≤P_c)

State switching condition 4 expression:

(C__all>0.05C_r) And (C \u)_30s>0) And (SOC)<75%) and (P)₃≤P_c)；

State switching condition 5 expression:

(C__all<-0.05C_r) And (C \u)_30s<0) And (SOC)>40%) and (P)₃≤P_c)

State switching condition 6 expression:

(C__all>0.4C_r) And (C \u)_30s>0) And (SOC)<35%) and (P)₄≤P_c)；

State switching condition 7 expression:

(C__all<-0.05C_r) And (C \u)_30s<0) And (SOC)>35%) and (P)₄≤P_c)

State switching condition 8 expression:

(C__all>0.05C_r) And (C \u)_30s>0) And (SOC)<30%) and (P)₅≤P_c)。

4. The fuel cell system operating power control method of the fuel cell passenger vehicle according to claim 3, characterized in that the fuel cell system state switching strategy is as follows;

setting the fuel cell system to have an operating power of P₁、P₂、P₃、P₄、P₅A total of 5 operating states, in which P₅>P₄>P₃>P₂>P₁；

When the fuel cell system is started, entering P by default₃Power ofWorking state;

when the four control parameter values satisfy the state switching condition 3, the fuel cell system is operated from P₃Power operating state switching to P₂A power operating state;

when the four control parameter values satisfy the state switching condition 1, the fuel cell system is operated from P₂Power operating state switching to P₁A power operating state;

when the four control parameter values satisfy the state switching condition 2, the fuel cell system is operated from P₁Power operating state switching to P₂A power operating state;

when the four control parameter values satisfy the state switching condition 4, the fuel cell system self-P₂Power operating state switching to P₃A power operating state;

when the four control parameter values satisfy the state switching condition 6, the fuel cell system self-P₃Power operating state switching to P₄A power operating state;

when the four control parameter values satisfy the state switching condition 8, the fuel cell system self-P₄Power operating state switching to P₅A power operating state;

when the four control parameter values satisfy the state switching condition 7, the fuel cell system self-P₅Power operating state switching to P₄A power operating state;

when the four control parameter values satisfy the state switching condition 5, the fuel cell system self-P₄Power operating state switching to P₃A power operating state.

5. The method for controlling the operating power of the fuel cell system of the fuel cell passenger car according to claim 1, wherein a fuel cell system state switching strategy is created in a matlab system and introduced into the vehicle controller.

6. The method of controlling the operating power of a fuel cell system of a fuel cell passenger vehicle according to claim 1, wherein the fuel cell system is in a startup condition where SOC is < 50%, and in a shutdown condition: SOC > 90%.

7. A control system for the working power of a fuel cell system of a fuel cell passenger car is characterized by comprising the following functional modules:

a strategy formulation module for integrating the operation value of the total current of the battery based on the total current of the battery after the fuel cell system enters each state and the latest 30 seconds integral operation value C __30sSOC value of battery, and charging power P bearable under current state of battery_cMaking and generating a fuel cell system state switching strategy by using the four control parameter values;

the calculation and judgment module is used for acquiring various data of the vehicle in real time, calculating the integral calculation value of the total current of the battery after the fuel cell system enters each state according to the various data of the vehicle, and calculating the latest 30-second integral calculation value C \ u of the total current of the battery after the fuel cell system enters each state_30sSOC value of battery, and charging power P bearable under current state of battery_cJudging whether the state switching condition is met or not according to the calculation result;

and the state switching module is used for controlling the fuel cell system to perform corresponding state switching when the calculation result meets any state switching condition.

Technical Field

The invention relates to the technical field of fuel cell automobile control, in particular to a method and a system for controlling the working power of a fuel cell system of a fuel cell passenger car.

Background

The rapid development of the new energy automobile industry in China lays a good foundation for the development of fuel cell automobiles, and compared with pure electric automobiles, the fuel cell automobiles taking hydrogen as fuel have superior environmental protection performance and also overcome the problems of insufficient endurance mileage and long charging time of the pure electric automobiles.

The fuel cell passenger car takes a fuel cell engine as a power source, in order to balance the required power of a power system, the vehicle is matched with a power battery system as an energy storage device. For better economy, the fuel cell system is typically rated less than the battery power, the fuel cell power is not able to meet peak motor power demands, the fuel cell is typically used as a system energy supply to supplement the balance of energy of the vehicle powertrain, and the balance of power is achieved by the power cell.

The fuel cell working energy flow direction has unidirectionality, and under the prior art, the working response speed is slow, and the required power of the vehicle is dynamically and rapidly changed, so that the adjustment of the working power of the fuel cell to respond to the dynamic required power of the vehicle is difficult to realize.

The power control of the fuel cell of the prior art or a common fuel cell passenger car is mostly based on the SOC of the battery and the required power of the vehicle motor to control the start-stop and working power of the fuel cell system.

Because the control of the fuel cell working power in the prior art is based on the battery SOC state or the power demand of the vehicle, under general conditions, the battery SOC is low, the power demand of the vehicle motor is high, the working power of the fuel cell is relatively large, the battery SOC is high, the power demand of the vehicle motor is low, the working power of the fuel cell is relatively small, the working efficiency of the fuel cell, the service life of the fuel cell and the charge-discharge capacity of the battery are difficult to be comprehensively considered by the setting of the working power of the fuel cell, and further the fuel cell system is frequently switched and frequently started and stopped at different powers, and the conversion efficiency of hydrogen fuel is low.

Disclosure of Invention

The invention aims to overcome the technical defects, provides a method and a system for controlling the working power of a fuel cell system of a fuel cell passenger car, and solves the problems that the working power of the fuel cell system is frequently switched and frequently started and stopped at different powers and the conversion efficiency of hydrogen fuel is low due to the fact that the energy consumption requirement of the vehicle and the working efficiency of the fuel cell system are difficult to comprehensively consider in the working power setting of the conventional fuel cell.

In order to achieve the technical purpose, the invention provides a method for controlling the working power of a fuel cell system of a fuel cell passenger car, which comprises the following steps:

based on the integrated operation value C of the total current of the battery after the fuel cell system enters each state and the latest 30 seconds of integrated operation value C of the total current of the battery after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cMaking and generating a fuel cell system state switching strategy by using the four control parameter values;

collecting various data of the vehicle in real time, calculating the integral calculation value C of the total current of the battery after the fuel cell system enters each state and the latest 30 seconds integral calculation value C of the total current of the battery after the fuel cell system enters each state according to the various data of the vehicle_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cJudging whether the state switching condition is met or not according to the calculation result;

and when the calculation result meets any state switching condition, controlling the fuel cell system to perform corresponding state switching.

The invention also provides a control system of the working power of the fuel cell system of the fuel cell passenger car, which comprises the following functional modules:

a strategy formulation module for integrating the operation value of the total current of the battery based on the total current of the fuel battery system after entering each state,The latest 30-second integral calculation value C of the total current of the fuel cell system after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cMaking and generating a fuel cell system state switching strategy by using the four control parameter values;

the calculation and judgment module is used for acquiring various data of the vehicle in real time, calculating the integral calculation value C of the total current of the battery after the fuel cell system enters each state and the latest 30-second integral calculation value C of the total current of the battery after the fuel cell system enters each state according to the various data of the vehicle_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cJudging whether the state switching condition is met or not according to the calculation result;

and the state switching module is used for controlling the fuel cell system to perform corresponding state switching when the calculation result meets any state switching condition.

Compared with the prior art, the method and the device have the advantages that the state switching strategy of the fuel cell system is worked out by comprehensively considering the energy consumption requirement of the vehicle and the working efficiency of the fuel cell system, so that the working power of the fuel cell system can be controlled based on the actual energy requirement of the vehicle, the fuel cell system can work in a relatively high-efficiency power region based on the current energy requirement state of the vehicle when working, different power switching and frequent starting and stopping are avoided, the conversion efficiency of hydrogen fuel is improved, and the working life of the fuel cell system is prolonged.

Drawings

Fig. 1 is a flow chart of a method for controlling the operating power of a fuel cell system of a fuel cell passenger vehicle according to an embodiment of the present invention;

FIG. 2 is a block diagram of a sub-flow of step S1 in FIG. 1;

fig. 3 is a block diagram of a control system for operating power of a fuel cell system of a fuel cell passenger vehicle according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, an embodiment of the present invention provides a method for controlling an operating power of a fuel cell system of a fuel cell passenger vehicle, including the steps of:

s1, integrating the calculated value of the total current of the battery based on the integrated value of the total current of the battery after the fuel cell system enters each state, and integrating the calculated value C of the latest 30 seconds of the total current of the battery after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cAnd four control parameter values are used for formulating and generating a fuel cell system state switching strategy.

After the fuel cell system enters each state, the integral operation value of the total current of the cell is used for measuring whether the total electric quantity of the power cell of the vehicle is increased or decreased relative to the rated electric quantity of the cell (a negative value indicates an increase, a positive value indicates a decrease, and C indicates a decrease) under the power working condition that the fuel cell enters a certain state_rThe rated capacity of the battery), the amount of increase and decrease. The latest 30-second integral calculation value C of the total current of the cell after the fuel cell system enters each state_{_30s}The method is used for measuring whether the total electric quantity of the vehicle power battery is increased or decreased within the last 30s under the power working condition that the fuel battery enters a certain state (a negative value indicates that the electric quantity of the battery is increased, and a positive value indicates that the electric quantity of the battery is decreased), and measuring the change trend of the electric quantity of the battery within the last 30 s. The SOC value of the battery is used for setting threshold values for judging that the fuel cell enters different powers. The charging power P bearable in the current state of the battery_cFor checking whether the fuel cell is going to operate at the next power and the power cell can be operated at the next continuous charging power.

And manufacturing and generating a fuel cell system state switching strategy in the matlab system, and introducing the fuel cell system state switching strategy into the whole vehicle controller. As shown in fig. 2, the method for making the state switching strategy of the fuel cell system comprises the following steps:

s11, setting various working states of the fuel cell system;

the working state of the fuel cell system can be set according to the working environment and the working requirement of the vehicle, different working powers of 5 fuel cells are listed, each working power fuel cell controller FCU carries out optimal calibration of system parameters, and the whole vehicle controller selects different working powers of the fuel cells to work according to the requirement of the vehicle. Generally, the fuel cells have different corresponding operating efficiencies under different operating powers, the efficiency of the fuel cell stack is different under different load factors, a large part of energy is consumed by accessories (such as an air compressor) of the fuel cell system, and the energy consumption of the accessories is not in a linear relationship with the operating power of the fuel cell stack, so that the operating efficiencies of the fuel cells are greatly different under different powers, the operating efficiency of the fuel cells is relatively low when the accessories work at a low power and a maximum power, and the efficiency is relatively high in a middle interval of the operating power of the fuel cells. The scheme is based on the working states listed by the fuel cell system under 5 different working powers, wherein the state 1 to the state 5 respectively correspond to the different working powers P₁、P₂、P₃、P₄、P₅And P is₅>P₄>P₃>P₂>P₁(ii) a Corresponding work efficiency is η₁、η₂、η₃、η₄、η₅(η₃>η₂>η₁、η₃>η₄>η₅) The operating efficiency of the fuel cell system is relatively high in the middle section, and the operating efficiency of high power and low power is relatively low.

S12, integrating the calculated value of the total current of the battery based on the integrated value of the total current of the battery after the fuel cell system enters each state, and integrating the calculated value C of the latest 30 seconds of the total current of the battery after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cA plurality of state switching conditions are set.

According to the above-set 5 operating states of the fuel cell system, the state switching conditions are set as follows:

state switching condition 1 expression:

(C_{_all}<-0.05C_r) And (C)_{_30s}<0) And (SOC)>85%) and (P)₁≤P_c)；

State switching condition 2 expression:

(C_{_all}>0.05C_r) And (C)_{_30s}>0) And (SOC)<80%) and (P)₂≤P_c)；

State switching condition 3 expression:

(C_{_all}<-0.4C_r) And (C)_{_30s}<0) And (SOC)>80%) and (P)₂≤P_c)

State switching condition 4 expression:

(C_{_all}>0.05C_r) And (C)_{_30s}>0) And (SOC)<75%) and (P)₃≤P_c)；

State switching condition 5 expression:

(C_{_all}<-0.05C_r) And (C)_{_30s}<0) And (SOC)>40%) and (P)₃≤P_c)

State switching condition 6 expression:

(C_{_all}>0.4C_r) And (C)_{_30s}>0) And (SOC)<35%) and (P)₄≤P_c)；

State switching condition 7 expression:

(C_{_all}<-0.05C_r) And (C)_{_30s}<0) And (SOC)>35%) and (P)₄≤P_c)

State switching condition 8 expression:

(C_{_all}>0.05C_r) And (C)_{_30s}>0) And (SOC)<30%) and (P)₅≤P_c)。

S13, setting each state switching condition to correspond to the operation state switching operation of one fuel cell system.

Specifically, the starting condition of the fuel cell system is that the SOC is less than 50%, and the shutdown condition is that: SOC > 90%.

When the fuel cell system is started, entering P by default₃A power operating state;

when the four control parameter values satisfy the state switching condition 3, the fuel cell system is operated from P₃Power operating state switching to P₂A power operating state;

when the four control parameter values satisfy the state switching condition 1, the fuel cell system is operated from P₂Power operating state switching to P₁A power operating state;

when the four control parameter values satisfy the state switching condition 2, the fuel cell system is operated from P₁Power operating state switching to P₂A power operating state;

when the four control parameter values satisfy the state switching condition 4, the fuel cell system self-P₂Power operating state switching to P₃A power operating state;

when the four control parameter values satisfy the state switching condition 6, the fuel cell system self-P₃Power operating state switching to P₄A power operating state;

when the four control parameter values satisfy the state switching condition 8, the fuel cell system self-P₄Power operating state switching to P₅A power operating state;

when the four control parameter values satisfy the state switching condition 7, the fuel cell system self-P₅Power operating state switching to P₄A power operating state;

when the four control parameter values satisfy the state switching condition 5, the fuel cell system self-P₄Power operating state switching to P₃A power operating state.

S2, collecting various data of the vehicle in real time, calculating the integral calculation value of the total current of the battery after the fuel cell system enters each state according to the various data of the vehicle, and calculating the latest 30-second integral calculation value C of the total current of the battery after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cJudging whether the state switching condition is met or not according to the calculation result;

and S3, when the calculation result meets any state switching condition, controlling the fuel cell system to perform corresponding state switching.

According to the method for controlling the working power of the fuel cell system of the fuel cell bus, the state switching strategy of the fuel cell system is worked out by comprehensively considering the energy consumption requirement of a vehicle and the working efficiency of the fuel cell system, so that the working power of the fuel cell system can be controlled based on the actual energy requirement of the vehicle, the fuel cell system can work in a relatively high-efficiency power area based on the current energy requirement state of the vehicle during working, switching and frequent starting and stopping of different powers are avoided, the conversion efficiency of hydrogen fuel is improved, and the working life of the fuel cell system is prolonged.

Based on the above method for controlling the operating power of the fuel cell system of the fuel cell passenger car, the present invention further provides a system for controlling the operating power of the fuel cell system of the fuel cell passenger car, as shown in fig. 3, which includes the following functional modules:

a strategy formulation module 10 for integrating the calculated value of the total current of the battery after the fuel cell system enters each state, and integrating the calculated value C of the latest 30 seconds of the total current of the battery after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cMaking and generating a fuel cell system state switching strategy by using the four control parameter values;

a calculating and judging module 20 for collecting various data of the vehicle in real time, calculating the integral operation value of the total current of the battery after the fuel cell system enters each state according to the various data of the vehicle, and calculating the latest 30-second integral operation value C of the total current of the battery after the fuel cell system enters each state_{_30s}SOC value of battery, and charging power P bearable under current state of battery_cJudging whether the state switching condition is met or not according to the calculation result;

and the state switching module 30 is used for controlling the fuel cell system to perform corresponding state switching when the calculation result meets any state switching condition.

The execution mode of the control system for the operating power of the fuel cell system of the fuel cell passenger car in this embodiment is basically the same as the control method for the operating power of the fuel cell system of the fuel cell passenger car, and therefore, detailed description is omitted.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art would appreciate that the modules, elements, and/or method steps of the various embodiments described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.