CN115303131A - An electric vehicle hybrid system based on symmetrical electrode SOFC and its control method - Google Patents

Abstract

The invention provides an electric vehicle hybrid system based on a symmetrical electrode SOFC and a control method thereof. The system includes a fuel supply module, an air supply module, a combustion chamber, a symmetrical electrode SOFC, a battery, a motor and a controller; the controller is used for controlling The fuel supply module and the air supply module respectively supply fuel and air to the combustion chamber; the combustion chamber provides heat to the symmetrical electrode SOFC according to the fuel and air; the anode side and the cathode side of the symmetrical electrode SOFC are communicated with the fuel supply module and the air supply module for The current is generated based on the heat provided by the combustion chamber; the controller is also used to control the symmetrical electrode SOFC and/or the battery driven motor. The invention utilizes the feature that the symmetrical electrodes SOFC electrodes can be switched to each other, avoids carbon deposition and ensures the long-term stability of the electric vehicle; uses hydrocarbons as fuel to get rid of the dependence on fossil fuels; sets the battery and/or SOFC to the motor Power supply to meet the long-term running needs of electric vehicles.

Description

A hybrid electric vehicle system and its control method based on symmetrical electrode SOFC

technical field

The invention relates to the technical field of electric vehicle power systems, in particular to an electric vehicle hybrid power system based on a symmetrical electrode SOFC and a control method thereof.

Background technique

The most ideal fuel for fuel cells is hydrogen energy. In the 21st century, the demand for hydrogen will continue to increase, and the most important applications may be fuel cells and fuel cell electric vehicles. Fuel cells can achieve continuous operation by refueling, especially suitable for use in remote areas, but hydrogen storage and transportation problems hinder the commercial development of fuel cells. The solution to this problem is to use catalytic conversion of liquid fuels with high energy density to generate hydrogen instantly. Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, SOFC) uses solid oxide as the electrolyte. In addition to its high efficiency and environmental friendliness, it has a wide range of fuel applications. In addition to being able to use hydrogen, it can also directly use liquid fuels .

However, when the SOFC battery uses hydrocarbons as fuel, carbon deposition will occur. The carbon deposition effect will affect the long-term stability of the battery and thus the performance output of the battery. Therefore, it is urgent to propose a hybrid power system for electric vehicles based on symmetrical electrode SOFC. The control method thereof is used for eliminating the carbon deposition effect of the SOFC battery, so as to ensure the long-term stable operation of the SOFC battery and the electric vehicle.

Contents of the invention

In view of this, it is necessary to provide a hybrid electric vehicle system based on symmetrical electrode SOFC and its control method, in order to solve the carbon deposition phenomenon that occurs when the SOFC battery uses hydrocarbons as fuel in the prior art Technical problems that lead to the inability of long-term stable operation of SOFC batteries and electric vehicles.

On the one hand, the present invention provides a hybrid power system for electric vehicles based on a symmetrical electrode SOFC, including a fuel supply module, an air supply module, a combustion chamber, a symmetrical electrode SOFC, a battery, a motor, and a controller; the inlets of the combustion chamber are respectively It communicates with the fuel supply module and the air supply module, the outlet of the combustion chamber communicates with the inlet of the symmetrical electrode SOFC, and the outlet of the symmetrical electrode SOFC communicates with the battery and the controller respectively, so The storage battery communicates with the controller;

The controller is configured to control the fuel supply module and the air supply module to supply fuel and air to the combustion chamber, respectively;

The combustion chamber provides heat to the symmetrical electrode SOFC according to the fuel and the air;

an anode side and a cathode side of the symmetrical electrode SOFC communicate with the fuel supply module and the air supply module for generating electrical current based on heat provided by the combustor;

The controller is also used to control the symmetrical electrode SOFC and/or the storage battery to drive the motor;

The controller is also used to control the symmetrical electrode SOFC to supply power to the storage battery.

In some possible implementations, the electric vehicle hybrid system based on symmetrical electrode SOFC further includes a two-position four-way solenoid valve, and the two-position four-way solenoid valve includes a first inlet, a second inlet, a first outlet, The second outlet and the third outlet, when the two-position four-way solenoid valve is in the first working state, the first inlet communicates with the first outlet, and the second inlet communicates with the second outlet; When the two-position four-way solenoid valve is in the second working state, the first inlet communicates with the second outlet, and the second inlet communicates with the third outlet;

When the two-position four-way solenoid valve is in the first working state, the fuel supply module communicates with the first inlet, the air supply module communicates with the second inlet, and the first outlet communicates with the The anode side of the symmetrical electrode SOFC is connected, and the second outlet is connected to the cathode side of the symmetrical electrode SOFC;

When the two-position four-way solenoid valve is in the second working state, the fuel supply module communicates with the first inlet, the air supply module communicates with the second inlet, and the second outlet communicates with the The cathode side of the symmetrical electrode SOFC communicates, and the third outlet communicates with the anode side of the symmetrical electrode SOFC.

In some possible implementations, the controller is also used to monitor the open circuit voltage of the symmetrical electrode SOFC in real time, and when the open circuit voltage is lower than the preset voltage, control the two-position four-way solenoid valve to work by the first The state is switched to the second working state, or the two-position four-way solenoid valve is controlled to switch from the second working state to the first working state.

In some possible implementations, the fuel supply module includes a fuel pump, a fuel flow regulating valve, and a mixer;

The fuel pump is used to provide fuel;

The fuel flow regulating valve is used to adjust the fuel flow entering the mixer and entering the combustion chamber according to the first control signal of the controller;

The inlet of the mixer communicates with the fuel flow regulating valve and the outlet of the symmetric electrode SOFC respectively, and the outlet of the mixer communicates with the inlet of the symmetric electrode SOFC for mixing fuel and the symmetric electrode SOFC The water vapor in the exhaust gas is mixed to form a mixed fuel, which is delivered to the symmetrical electrode SOFC.

In some possible implementation manners, the fuel supply module further includes a fuel path heat exchanger arranged between the mixer and the symmetrical electrode SOFC;

The heat flow inlet of the fuel path heat exchanger communicates with the outlet of the combustion chamber, and the air flow inlet of the fuel path heat exchanger communicates with the outlet of the mixer for mixing the mixture based on the heat generated by the combustion chamber. The fuel is preheated.

In some possible implementations, the air supply module includes an air compressor and a gas flow regulating valve;

The air compressor is used to obtain and compress air;

The gas flow regulating valve is used for regulating the air flow entering the symmetrical electrode SOFC and entering the combustion chamber according to the second control signal of the controller.

In some possible implementation manners, the air supply module further includes an air path heat exchanger arranged between the gas flow regulating valve and the symmetrical electrode SOFC;

The airflow inlet of the air path heat exchanger is connected with the gas flow regulating valve, and the heat flow inlet of the air path heat exchanger is connected with the heat flow outlet of the fuel path heat exchanger, for Preheat the air.

In some possible implementation manners, the air supply module further includes a heat regulating solenoid valve arranged between the fuel path heat exchanger and the air path heat exchanger, and the heat regulating solenoid valve is used to The third control signal of the controller adjusts the heat entering the air path heat exchanger.

In some possible implementation manners, the electric vehicle hybrid system based on symmetrical electrode SOFC further includes a temperature sensor arranged between the combustion chamber and the symmetrical electrode SOFC, and the temperature sensor is used to monitor the symmetrical electrode SOFC. The temperature of the electrode SOFC;

The controller is used for generating the first control signal, the second control signal and the third control signal according to the temperature of the symmetrical electrode SOFC.

In some possible implementations, the electric vehicle hybrid power system based on symmetrical electrode SOFC further includes a water vapor separator, a water tank, and a steam generator communicated with the outlet of the symmetrical electrode SOFC;

The water vapor separator is used to collect the tail gas of the symmetrical electrode SOFC, and transport the moisture in the tail gas to the water tank, and transport the gas in the tail gas to the combustion chamber;

the water tank delivers the moisture to the steam generator;

The steam generator is used to convert the moisture into water vapor, which is input to the mixer.

On the other hand, the present invention also provides a control method for an electric vehicle hybrid power system based on a symmetrical electrode SOFC, which is applicable to the electric vehicle hybrid power system based on a symmetrical electrode SOFC described in any of the above possible implementation modes, The control method of the electric vehicle hybrid system based on symmetrical electrode SOFC includes:

Real-time monitoring of the power of the battery, and judging whether the power of the battery is less than the preset power;

When the power of the battery is greater than or equal to a preset power, control the battery to drive the motor;

When the power of the storage battery is less than the preset power, control the fuel supply module and the air supply module to provide fuel and air to the combustion chamber, so that the combustion chamber provides heat to the symmetrical electrode SOFC;

When the temperature of the symmetrical electrode SOFC reaches a preset temperature value, control the fuel supply module and the air supply module to supply fuel and air to the symmetrical electrode SOFC, so that the symmetrical electrode SOFC reacts;

Control the symmetrical electrode SOFC to supply power to the storage battery, or control the symmetrical electrode SOFC and/or the storage battery to drive the motor.

The beneficial effects of adopting the above embodiment are: the electric vehicle hybrid power system based on the symmetrical electrode SOFC provided by the present invention can avoid carbon deposition by setting the symmetrical electrode SOFC and utilizing the characteristic that the symmetrical electrode SOFC electrodes can switch between each other. Ensure the long-term stability of symmetrical electrode SOFC and electric vehicles.

Further, the present invention utilizes hydrocarbons as fuel, thus getting rid of the dependence on fossil fuels; and can control the symmetrical electrode SOFC and/or the battery-driven motor, and when the battery power is insufficient, the symmetrical electrode SOFC can independently supply power to the motor and Charging the battery can meet the long-term operation needs of electric vehicles.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of an embodiment of an electric vehicle hybrid power system based on a symmetrical electrode SOFC provided by the present invention;

Fig. 2 is a schematic structural view of an embodiment of a two-position four-way solenoid valve provided by the present invention;

Fig. 3 is a schematic flow chart of an embodiment of a control method for a hybrid system of an electric vehicle based on a symmetrical electrode SOFC provided by the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, unless otherwise specified, "and/or" describes the association relationship of associated objects, indicating that there may be three kinds of relationships, for example: A and/or B, may indicate: A exists alone, and at the same time There are three cases of A and B, and B alone.

It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this disclosure illustrate operations implemented in accordance with some embodiments of the present invention. It should be understood that the operations of the flowcharts may be performed out of order, and steps that do not have a logical context may be performed in reverse order or simultaneously. In addition, those skilled in the art may add one or more other operations to the flowchart, or remove one or more operations from the flowchart under the guidance of the content of the present invention.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Embodiments of the present invention provide an electric vehicle hybrid power system based on symmetrical electrode SOFC and a control method thereof, which will be described respectively below.

Fig. 1 is a schematic flow chart of an embodiment of an electric vehicle hybrid power system based on symmetrical electrode SOFC provided by the present invention. As shown in Fig. 1 , the electric vehicle hybrid power system 10 based on symmetrical electrode SOFC includes a fuel supply module 100, an air supply module 200, combustion chamber 300, symmetrical electrode SOFC (Solid Oxide Fuel Cell, Solid Oxide FuelCell) 400, battery 500, motor 600 and controller 700; the entrance of combustion chamber 300 communicates with fuel supply module 100 and air supply module 200 respectively, The outlet of the combustion chamber 300 communicates with the inlet of the symmetrical electrode SOFC400, the outlet of the symmetrical electrode SOFC400 communicates with the battery 500 and the controller 700 respectively, and the battery 500 communicates with the controller 700;

The controller 700 is used to control the fuel supply module 100 and the air supply module 200 to supply fuel and air to the combustion chamber 300 respectively;

Combustion chamber 300 provides heat to symmetrical electrode SOFC 400 according to fuel and air;

The anode side and the cathode side of the symmetrical electrode SOFC 400 communicate with the air supply module 100 and the fuel supply module 200 for generating electric current based on the heat provided by the combustion chamber;

The controller 700 is also used to control the symmetrical electrode SOFC 400 and/or the storage battery 500 to drive the motor 600;

The controller 700 is also used to control the symmetrical electrode SOFC 400 to supply power to the storage battery 500 .

Compared with the prior art, the electric vehicle hybrid power system 10 based on the symmetrical electrode SOFC provided by the embodiment of the present invention can avoid carbon deposition by setting the symmetrical electrode SOFC400 and utilizing the characteristic that the electrodes of the symmetrical electrode SOFC400 can switch between each other. It can ensure the long-term stability of symmetrical electrode SOFC400 and electric vehicles.

Further, the embodiments of the present invention use hydrocarbons as fuels, which breaks away from the dependence on fossil fuels; and can control the symmetrical electrode SOFC400 and/or battery 500 to drive the motor 600, and when the battery 500 is insufficient, the symmetrical electrode SOFC400 can perform Powering the motor 600 and charging the storage battery 500 alone can meet the long-term operation requirements of the electric vehicle.

It should be noted that the fuel supplied by the fuel supply module 100 in the embodiment of the present invention is ethanol.

Since ethanol has a wide range of sources and low cost, setting the fuel as ethanol can reduce the cost of the electric vehicle hybrid system 10 based on symmetrical electrode SOFC, and get rid of dependence on fossil fuels and hydrogen refueling stations.

Further, the embodiment of the present invention can control the symmetrical electrode SOFC 400 and/or the battery 500 to drive the motor 600. When the battery 500 is insufficient, the symmetrical electrode SOFC 400 can independently supply power to the motor 600 and charge the battery 500, which can meet the needs of electric vehicles. Long-term running requirements.

In a specific embodiment of the present invention, as shown in FIG. 1 and FIG. 2 , the electric vehicle hybrid power system based on symmetrical electrode SOFC further includes a two-position four-way solenoid valve 800, and the two-position four-way solenoid valve 800 includes a first inlet 810 , the second inlet 820, the first outlet 830, the second outlet 840, and the third outlet 850. When the two-position four-way solenoid valve 800 is in the first working state, the first inlet 810 communicates with the first outlet 830, and the second inlet 820 communicates with the second outlet 840; when the two-position four-way solenoid valve 800 is in the second working state, the first inlet 810 communicates with the second outlet 840, and the second inlet 820 communicates with the third outlet 850;

When the two-position four-way solenoid valve 800 is in the first working state, the fuel supply module 100 communicates with the first inlet 810, the air supply module 200 communicates with the second inlet 820, and the first outlet 830 communicates with the anode side of the symmetrical electrode SOFC400, The second outlet 840 communicates with the cathode side of the symmetrical electrode SOFC 400;

When the two-position four-way solenoid valve 800 is in the second working state, the fuel supply module 100 communicates with the first inlet 810, the air supply module 200 communicates with the second inlet 820, and the second outlet 840 communicates with the cathode side of the symmetrical electrode SOFC400, The third outlet 850 communicates with the anode side of the symmetrical electrode SOFC 400 .

In the embodiment of the present invention, the switching between the anode side and the cathode side can be realized by setting the different working states of the two-position four-way solenoid valve 800 and the communication relationship between the anode side and the cathode side of the symmetrical electrode SOFC400, thereby eliminating carbon deposition.

In some embodiments of the present invention, the controller 700 is also used to monitor the open circuit voltage of the symmetrical electrode SOFC400 in real time, and when the open circuit voltage is lower than the preset voltage, control the two-position four-way solenoid valve 800 to switch from the first working state to the second working state, or control the two-position four-way solenoid valve 800 to switch from the second working state to the first working state.

It should be understood that: when it is detected that the open circuit voltage of the symmetrical electrode SOFC400 is less than the preset voltage, the working state of the two-position four-way solenoid valve 800 is the first working state, and the controller 700 controls the two-position four-way solenoid valve 800 to be the first working state. The first working state is switched to the second working state; and when it is detected that the open circuit voltage of the symmetrical electrode SOFC400 is less than the preset voltage, the working state of the two-position four-way solenoid valve 800 is the second working state, and the controller 700 controls the two-position four-way The through solenoid valve 800 is switched from the second working state to the first working state.

In the embodiment of the present invention, by controlling the switching of the working state of the two-position four-way solenoid valve 800, the opening of different channels changes the working state of the symmetrical electrode SOFC 400 (that is, the cathode and anode are reversed), thereby eliminating the carbon deposition effect.

In some embodiments of the present invention, as shown in FIG. 1 , the fuel supply module 100 includes a fuel pump 110 , a fuel flow regulating valve 120 and a mixer 130 ;

The fuel pump 110 is used to provide fuel;

The fuel flow regulating valve 120 is used for regulating the fuel flow entering the mixer 130 and entering the combustion chamber 300 according to the first control signal of the controller 700;

The inlet of the mixer 130 communicates with the fuel flow regulating valve 120 and the outlet of the symmetrical electrode SOFC400 respectively, and the outlet of the mixer 130 communicates with the inlet of the symmetrical electrode SOFC400, which is used to mix the fuel and the water vapor in the tail gas of the symmetrical electrode SOFC400 to generate The fuel is mixed and delivered to the symmetrical electrode SOFC 400.

In the embodiment of the present invention, by setting the fuel flow regulating valve 120 , the heat generated by the combustion chamber 300 can be adjusted, so that the temperature of the symmetrical electrode SOFC 400 can be precisely adjusted, and the working reliability of the symmetrical electrode SOFC 400 can be improved.

Further, in the embodiment of the present invention, the fuel and the water vapor in the tail gas of the symmetrical electrode SOFC400 are mixed to generate a mixed fuel, and the mixed fuel is delivered to the symmetrical electrode SOFC400, so that the tail gas of the symmetrical electrode SOFC400 can be reused, and the improvement based on Utilization of Symmetrical Electrode SOFCs in Electric Vehicle Hybrid Systems 10 .

In order to further improve the efficiency of the symmetrical electrode SOFC400, in some embodiments of the present invention, as shown in FIG.

The heat flow inlet of the fuel heat exchanger 140 communicates with the outlet of the combustion chamber 300 , and the air flow inlet of the fuel heat exchanger 140 communicates with the outlet of the mixer 130 for preheating the mixed fuel based on the heat generated by the combustion chamber.

In the embodiment of the present invention, by setting the fuel path heat exchanger 140, the heat generated by the combustion chamber 300 can be used to preheat the mixed fuel, and there is no need to preheat the mixed fuel in the symmetrical electrode SOFC400, which can further improve the efficiency of the symmetrical electrode SOFC400 .

In some embodiments of the present invention, as shown in FIG. 1 , the air supply module 200 includes an air compressor 210 and a gas flow regulating valve 220;

Air compressor 210 is used for obtaining and compressing air;

The gas flow regulating valve 220 is used to regulate the air flow entering the symmetrical electrode SOFC 400 and the combustion chamber 300 according to the second control signal of the controller 700 .

In the embodiment of the present invention, by setting the gas flow regulating valve 220 , the heat generated by the combustion chamber 300 can be adjusted, so that the temperature of the symmetrical electrode SOFC 400 can be precisely adjusted, and the working reliability of the symmetrical electrode SOFC 400 can be further improved.

In order to avoid the impact of impurities in the air on the heat generated by the combustion chamber 300, in some embodiments of the present invention, as shown in FIG. The air in the air compressor 210 is cleaned.

In the embodiment of the present invention, by setting the air purifier 230, the purity of the air can be improved, thereby further improving the accuracy of temperature control of the symmetrical electrode SOFC 400 .

In some embodiments of the present invention, as shown in FIG. 1 , the air supply module 200 further includes an air path heat exchanger 240 disposed between the gas flow regulating valve 220 and the symmetrical electrode SOFC400;

The airflow inlet of the air path heat exchanger 240 is connected with the gas flow regulating valve 220, and the heat flow inlet of the air path heat exchanger 240 is connected with the heat flow outlet of the fuel path heat exchanger 140, which is used to heat the air based on the heat generated by the combustion chamber 300. warm up.

In the embodiment of the present invention, by setting the air path heat exchanger 240, the heat generated by the combustion chamber 300 can be used to preheat the air, without preheating the air in the symmetrical electrode SOFC 400, and the efficiency of the symmetrical electrode SOFC 400 can be further improved.

In order to prevent the temperature in the symmetrical electrode SOFC400 from being too high, in some embodiments of the present invention, as shown in FIG. 1 , the air supply module 200 further includes a Heat regulation solenoid valve 250 . The heat regulation solenoid valve 250 is used to regulate the heat entering the air path heat exchanger 240 according to the third control signal of the controller 700 .

In the embodiment of the present invention, by setting the heat regulating solenoid valve 250, when the temperature in the symmetrical electrode SOFC 400 is too high, the heat regulating solenoid valve 250 can be controlled not to provide heat to the air path heat exchanger 240, thereby avoiding preheating the air , play the role of air cooling.

Because the temperature of the symmetrical electrode SOFC400 has a great influence on the efficiency of the symmetrical electrode SOFC400, therefore, in some embodiments of the present invention, as shown in FIG. A temperature sensor 900 between the chamber 300 and the symmetrical electrode SOFC 400, the temperature sensor 900 is used to monitor the temperature of the symmetrical electrode SOFC 400;

The controller 700 is used for generating a first control signal, a second control signal and a third control signal according to the temperature of the symmetrical electrode SOFC 400 .

In the embodiment of the present invention, the first control signal, the second control signal, and the third control signal are generated according to the temperature of the symmetrical electrode SOFC400 to adjust the fuel flow regulating valve 120, the gas flow regulating valve 220, and the heat regulating solenoid valve 250. Improve the rationality of adjusting the fuel flow regulating valve 120 , the gas flow regulating valve 220 and the heat regulating solenoid valve 250 , thereby improving the rationality of the temperature of the symmetrical electrode SOFC 400 , thereby ensuring the efficiency of the symmetrical electrode SOFC 400 .

In some embodiments of the present invention, as shown in FIG. 1 , the electric vehicle hybrid power system 10 based on the symmetrical electrode SOFC further includes a water vapor separator 1000 , a water tank 1100 and a steam generator 1200 communicated with the outlet of the symmetrical electrode SOFC 400 ;

The water vapor separator 1000 is used to collect the tail gas of the symmetrical electrode SOFC400, transport the moisture in the tail gas to the water tank 1100, and transport the gas in the tail gas to the combustion chamber 300;

The water tank 1100 delivers the moisture to the steam generator 1200;

The steam generator 1200 is used to convert moisture into water vapor, and input it to the mixer 130 .

The embodiment of the present invention can improve the overall heat utilization of the electric vehicle hybrid power system 10 based on symmetrical electrode SOFC by transporting other than moisture in the exhaust gas to the combustion chamber 300, and inputting the changed water vapor of the moisture into the mixer 130 efficiency.

In some embodiments of the present invention, as shown in FIG. 1 , the electric vehicle hybrid power system 10 based on the symmetric electrode SOFC further includes a DC/DC converter 1300 arranged between the symmetric electrode SOFC 400 and the controller 700, through DC/DC The DC converter 1300 converts the current generated by the symmetrical electrode SOFC 400 into a variable DC voltage to drive the motor 600 .

On the other hand, on the basis of the electric vehicle hybrid power system based on the symmetrical electrode SOFC, correspondingly, the embodiment of the present invention also provides a control method for the electric vehicle hybrid power system based on the symmetrical electrode SOFC, which is applicable to any of the above-mentioned The electric vehicle hybrid power system based on the symmetrical electrode SOFC described in this embodiment; as shown in Figure 3, the control method based on the electric vehicle hybrid power system of the symmetrical electrode SOFC includes:

S301. Monitor the power of the storage battery in real time, and determine whether the power of the battery is less than a preset power;

S302. When the power of the battery is greater than or equal to the preset power, control the battery to drive the motor;

S303. When the power of the battery is less than the preset power, control the fuel supply module and the air supply module to supply fuel and air to the combustion chamber, so that the combustion chamber provides heat to the symmetrical electrode SOFC;

S304. When the temperature of the symmetrical electrode SOFC reaches a preset temperature value, control the fuel supply module and the air supply module to supply fuel and air to the symmetrical electrode SOFC, so that the symmetrical electrode SOFC reacts;

S305. Control the symmetrical electrode SOFC to supply power to the storage battery, or control the symmetrical electrode SOFC and/or the storage battery to drive the motor.

It should be noted that: due to the existence of carbon deposition, the open circuit voltage of the symmetrical electrode SOFC will decrease. Therefore, in some embodiments of the present invention, the control method of the electric vehicle hybrid system based on the symmetrical electrode SOFC further includes:

Real-time monitoring of the open circuit voltage of the symmetrical electrode SOFC; when the open circuit voltage of the symmetrical electrode SOFC drops to a limited level, control the two-position four-way solenoid valve to switch from the first working state to the second working state, and keep the second working state to continue Carry out the electrochemical reaction. After running for a period of time, when the open circuit voltage of the symmetrical electrode SOFC is detected again to drop to a limited level, the two-position four-way solenoid valve is controlled to switch from the second working state to the first working state, so as to This continues to ensure that the carbon deposits produced by the symmetrical electrode SOFC can be removed in time and effectively.

It should also be noted that the steps in the method in the above embodiments can be increased or expanded according to the modules or units in the electric vehicle hybrid system based on symmetrical electrode SOFC, for details, see Electric Vehicle Hybrid Power System Based on Symmetrical Electrode SOFC The description in the system embodiment will not be repeated here.

The electric vehicle hybrid power system and its control method based on the symmetrical electrode SOFC provided by the present invention have been introduced in detail above. The principles and implementation methods of the present invention have been explained by using specific examples in this paper. The description of the above embodiments is only used To help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be construed as a limitation of the invention.

Claims (10)

1. A kind of electric vehicle hybrid power system based on symmetrical electrode SOFC, it is characterized in that, comprises fuel supply module, air supply module, combustion chamber, symmetrical electrode SOFC, storage battery, motor and controller; The entrance of described combustion chamber is connected with respectively The fuel supply module communicates with the air supply module, the outlet of the combustion chamber communicates with the symmetrical electrode SOFC, the outlet of the symmetrical electrode SOFC communicates with the storage battery and the controller respectively, and the storage battery communicates with the controller the controller communicates; The controller is configured to control the fuel supply module and the air supply module to supply fuel and air to the combustion chamber, respectively; The combustion chamber provides heat to the symmetrical electrode SOFC according to the fuel and the air; an anode side and a cathode side of the symmetrical electrode SOFC communicate with the fuel supply module and the air supply module for generating electrical current based on heat provided by the combustor; The controller is also used to control the symmetrical electrode SOFC and/or the storage battery to drive the motor; The controller is also used to control the symmetrical electrode SOFC to supply power to the storage battery. 2. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 1, characterized in that, the electric vehicle hybrid power system based on symmetrical electrode SOFC also includes a two-position four-way solenoid valve, and the two-position four-way solenoid valve The one-way solenoid valve includes a first inlet, a second inlet, a first outlet, a second outlet and a third outlet. When the two-position four-way solenoid valve is in the first working state, the first inlet and the first The outlet is connected, the second inlet is connected with the second outlet; when the two-position four-way solenoid valve is in the second working state, the first inlet is connected with the second outlet, and the second inlet communicate with the third exit; When the two-position four-way solenoid valve is in the first working state, the fuel supply module communicates with the first inlet, the air supply module communicates with the second inlet, and the first outlet communicates with the The anode side of the symmetrical electrode SOFC is connected, and the second outlet is connected to the cathode side of the symmetrical electrode SOFC; When the two-position four-way solenoid valve is in the second working state, the fuel supply module communicates with the first inlet, the air supply module communicates with the second inlet, and the second outlet communicates with the The cathode side of the symmetrical electrode SOFC communicates, and the third outlet communicates with the anode side of the symmetrical electrode SOFC. 3. The electric vehicle hybrid system based on symmetrical electrode SOFC according to claim 2, wherein the controller is also used for real-time monitoring of the open circuit voltage of the symmetrical electrode SOFC, when the open circuit voltage is less than the preset voltage, control the two-position four-way solenoid valve to switch from the first working state to the second working state, or control the two-position four-way solenoid valve to switch from the second working state to the first working state. 4. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 1, wherein the fuel supply module comprises a fuel pump, a fuel flow regulating valve and a mixer; The fuel pump is used to provide fuel; The fuel flow regulating valve is used for regulating the fuel flow entering the mixer and entering the combustion chamber according to the first control signal of the controller. 5. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 4, characterized in that, the fuel supply module further comprises a fuel circuit heat exchange device arranged between the mixer and the symmetrical electrode SOFC device; The heat flow inlet of the fuel path heat exchanger communicates with the outlet of the combustion chamber, and the air flow inlet of the fuel path heat exchanger communicates with the outlet of the mixer for mixing the mixture based on the heat generated by the combustion chamber. The fuel is preheated. 6. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 5, wherein the air supply module includes an air compressor, a gas flow regulating valve, and an air flow regulating valve arranged between the gas flow regulating valve and the Air path heat exchanger between symmetrical electrode SOFC; The air compressor is used to obtain and compress air; The gas flow regulating valve is used to adjust the air flow entering the symmetrical electrode SOFC and entering the combustion chamber according to the second control signal of the controller; The airflow inlet of the air path heat exchanger is connected with the gas flow regulating valve, and the heat flow inlet of the air path heat exchanger is connected with the heat flow outlet of the fuel path heat exchanger, for Preheat the air. 7. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 6, wherein the air supply module further comprises a The heat regulating solenoid valve is used for regulating the heat entering the air path heat exchanger according to the third control signal of the controller. 8. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 7, characterized in that, the electric vehicle hybrid power system based on symmetrical electrode SOFC also includes A temperature sensor between them, the temperature sensor is used to monitor the temperature of the symmetrical electrode SOFC; The controller is used for generating the first control signal, the second control signal and the third control signal according to the temperature of the symmetrical electrode SOFC. 9. The electric vehicle hybrid power system based on symmetrical electrode SOFC according to claim 3, characterized in that, the electric vehicle hybrid power system based on symmetrical electrode SOFC also includes a water vapor separator communicated with the outlet of the symmetrical electrode SOFC water tank and steam generator; The water vapor separator is used to collect the tail gas of the symmetrical electrode SOFC, and transport the moisture in the tail gas to the water tank, and transport the gas in the tail gas to the combustion chamber; the water tank delivers the moisture to the steam generator; The steam generator is used to convert the moisture into water vapor, which is input to the mixer. 10. A control method for an electric vehicle hybrid power system based on a symmetrical electrode SOFC, characterized in that it is applicable to the electric vehicle hybrid power system based on a symmetrical electrode SOFC according to any one of claims 1-9, the said symmetrical electrode based SOFC The control method of the electrode SOFC electric vehicle hybrid system includes: Real-time monitoring of the power of the battery, and judging whether the power of the battery is less than the preset power; When the power of the battery is greater than or equal to a preset power, control the battery to drive the motor; When the power of the storage battery is less than the preset power, control the fuel supply module and the air supply module to provide fuel and air to the combustion chamber, so that the combustion chamber provides heat to the symmetrical electrode SOFC; When the temperature of the symmetrical electrode SOFC reaches a preset temperature value, control the fuel supply module and the air supply module to supply fuel and air to the symmetrical electrode SOFC, so that the symmetrical electrode SOFC reacts; Control the symmetrical electrode SOFC to supply power to the storage battery, or control the symmetrical electrode SOFC and/or the storage battery to drive the motor.

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