CN111619401A - Auxiliary power generation control method and system of extended-range fuel cell vehicle, vehicle control unit and extended-range fuel cell vehicle - Google Patents
Auxiliary power generation control method and system of extended-range fuel cell vehicle, vehicle control unit and extended-range fuel cell vehicle Download PDFInfo
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- CN111619401A CN111619401A CN202010477637.5A CN202010477637A CN111619401A CN 111619401 A CN111619401 A CN 111619401A CN 202010477637 A CN202010477637 A CN 202010477637A CN 111619401 A CN111619401 A CN 111619401A
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- 239000000446 fuel Substances 0.000 title claims abstract description 134
- 238000010248 power generation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000017525 heat dissipation Effects 0.000 claims abstract description 37
- 238000013507 mapping Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/31—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for starting of fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Fuel Cell (AREA)
Abstract
The invention provides an auxiliary power generation control method and system of an extended range fuel cell vehicle, a vehicle control unit and the extended range fuel cell vehicle, which are used for preventing a fuel cell system from being overheated and reducing the service life of the fuel cell system. The method comprises the following steps: when the current residual electric quantity of the power battery is lower than a first set electric quantity value, outputting a starting instruction for requesting the fuel battery system to work, so that the fuel battery system is started and enters an idling state; determining basic generating power of the fuel cell system based on the current residual capacity of the power cell; determining a driver demand power offset based on an accelerator pedal opening of a vehicle; determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle; determining target generating power according to the basic generating power, the driver required power offset and the maximum heat dissipation power; and sending the target power generation power to the fuel cell system to enable the fuel cell system to generate power and supply power for the motor and the power battery.
Description
Technical Field
The invention belongs to the field of extended range fuel cell automobiles, and particularly relates to an auxiliary power generation control method and system of an extended range fuel cell automobile, a whole automobile controller and the extended range fuel cell automobile.
Background
The extended range fuel cell automobile mainly comprises a fuel cell system, a whole automobile control system, a power battery, a motor and automobile body accessories thereof. The control of the generated power of the fuel cell system is mainly determined by the vehicle control system according to the remaining capacity of the power cell at present. The actual requirements of a driver are not considered, the capability of the vehicle cannot be fully exerted under the working conditions with low-power and high-power requirements (such as the working conditions of low-power starting and large accelerator acceleration, low-power climbing and the like), and the vehicle cannot run even when the power is extremely low. Meanwhile, the control method does not consider the difference of the heat dissipation capacity of the vehicle under different working conditions, and when the heat dissipation capacity of the vehicle is low and the power generation power of the fuel cell system is high, the fuel cell system is overheated, so that the service life of the fuel cell system is shortened.
Disclosure of Invention
The invention provides an auxiliary power generation control method and system of an extended range fuel cell vehicle, a vehicle control unit and the extended range fuel cell vehicle, which are used for preventing a fuel cell system from being overheated and reducing the service life of the fuel cell system.
The technical scheme of the invention is as follows:
the invention provides an auxiliary power generation control method of an extended range fuel cell automobile, which is applied to a whole automobile controller and comprises the following steps:
acquiring the current residual capacity of a power battery, the opening degree and the wheel speed of an accelerator pedal of a vehicle and the ambient temperature of the position of the vehicle;
when the current residual capacity of the power battery is lower than a first set electric quantity value, outputting a starting instruction for requesting the fuel cell system to work, and enabling the fuel cell system to start and enter an idling state based on the starting instruction;
determining basic generating power of the fuel cell system based on the current residual capacity of the power cell;
determining a driver demand power offset based on an accelerator pedal opening of a vehicle;
determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
determining target generating power of a fuel cell system according to the basic generating power, the driver required power offset and the maximum heat dissipation power;
and sending the target power generation power to a fuel cell system, so that the fuel cell system in an idling state generates power according to the target power generation power, and supplies power to a motor and a power battery.
Preferably, the step of determining the base generated power of the fuel cell system based on the current remaining capacity of the power cell includes:
determining the basic generating power of the fuel cell system according to the mapping relation between the current residual capacity of the power cell and the basic generating power of the fuel cell system which are calibrated in advance;
the step of determining the driver required power offset amount based on the accelerator pedal opening degree of the vehicle includes:
and determining the power offset required by the driver according to a mapping relation between the opening of the accelerator pedal and the power offset required by the driver, which is calibrated in advance.
Preferably, the step of determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature in which the vehicle is located comprises:
multiplying the wheel speed by the wheel radius r to obtain the vehicle speed;
and determining the maximum heat dissipation power of the vehicle according to the mapping relation of the vehicle speed, the environment temperature and the maximum heat dissipation power of the vehicle which are calibrated in advance.
Preferably, the step of determining the target generated power of the fuel cell system based on the base generated power, the driver-demanded power offset, and the maximum heat dissipation power includes:
and adding the basic generating power of the fuel cell system and the offset of the power required by the driver to obtain a power intermediate value, and determining the smaller value of the power intermediate value and the maximum heat dissipation power as the target generating power.
Preferably, the method further comprises:
when the current residual electric quantity of the power battery is higher than a second set electric quantity value, outputting a shutdown instruction for requesting the fuel cell system to stop working, and enabling the fuel cell system to be shut down based on the shutdown instruction; the second set electric quantity value is larger than the first set electric quantity.
The embodiment of the invention also provides an auxiliary power generation control system of the extended range fuel cell automobile, which comprises the following components:
a vehicle control unit;
the system comprises a fuel cell system, a motor, a power cell, a wheel speed sensor, an environment temperature sensor and an accelerator pedal opening sensor, wherein the fuel cell system, the motor, the power cell, the wheel speed sensor, the environment temperature sensor and the accelerator pedal opening sensor are connected with the whole vehicle controller through low-voltage wiring harnesses; the fuel cell system is connected with the motor and the power battery through a high-voltage wire harness, and the motor and the power battery are connected through the high-voltage wire harness;
the whole vehicle controller is specifically used for:
acquiring the current residual electric quantity of a power battery, the accelerator pedal opening of a vehicle acquired by an accelerator pedal opening sensor, the wheel speed acquired by a wheel speed sensor and the environment temperature of the position of the vehicle acquired by an environment temperature sensor;
when the current residual capacity of the power battery is lower than a first set electric quantity value, outputting a starting instruction for requesting the fuel cell system to work, and enabling the fuel cell system to start and enter an idling state based on the starting instruction;
determining basic generating power of the fuel cell system based on the current residual capacity of the power cell;
determining a driver demand power offset based on an accelerator pedal opening of a vehicle;
determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
determining target generating power of a fuel cell system according to the basic generating power, the driver required power offset and the maximum heat dissipation power;
and sending the target power generation power to a fuel cell system, so that the fuel cell system in an idling state generates power according to the target power generation power, and supplies power to a motor and a power battery.
The embodiment of the present invention further provides a vehicle control unit, including:
the acquisition module is used for acquiring the current residual electric quantity of the power battery, the opening degree and the wheel speed of an accelerator pedal of the vehicle and the ambient temperature of the position of the vehicle;
the request module is used for outputting a starting instruction for requesting the fuel cell system to work when the current residual electric quantity of the power battery is lower than a set electric quantity value, so that the fuel cell system is started based on the starting instruction and enters an idling state;
the first determination module is used for determining basic generating power of the fuel cell system based on the current residual capacity of the power cell;
the second determination module is used for determining the offset of the power required by the driver based on the opening degree of an accelerator pedal of the vehicle;
the third determination module is used for determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
the fourth determination module is used for determining the target generating power of the fuel cell system according to the basic generating power, the offset of the power required by the driver and the maximum heat dissipation power;
and the sending module is used for sending the target generating power to a fuel cell system, so that the fuel cell system in an idling state generates power according to the target generating power and supplies power to a motor and a power battery.
The embodiment of the invention also provides an extended range fuel cell automobile, which comprises the auxiliary power generation control system of the extended range fuel cell automobile.
The invention has the beneficial effects that:
under the working condition of low electric quantity and high power demand, the output power of the fuel cell system is increased, so that the power performance of the whole vehicle is better;
the heat dissipation capacity of the whole vehicle is considered in the infringement of the power generation power of the fuel cell system, the overheating risk of the fuel cell system is reduced, and the service life of the fuel cell system is prolonged.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a block diagram of the system of the present invention.
Description of reference numerals: the system comprises a fuel cell system 1, a motor 2, a high-voltage direct-current circuit 3, a vehicle control unit 4, a power battery 5, a low-voltage communication circuit 6, a wheel speed sensor 7, an environment temperature sensor 8 and an accelerator pedal opening degree sensor 9.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1, the present invention provides an auxiliary power generation control method for an extended range fuel cell vehicle, which is applied to a vehicle controller, and includes:
step S101, acquiring the current remaining capacity of the power battery 5, the opening degree of an accelerator pedal and the wheel speed of the vehicle, and the ambient temperature of the position where the vehicle is located.
The current remaining capacity of the power battery 5 can be obtained from a battery management system BMS of the vehicle, and information interaction between the vehicle control unit and the battery management system BMS is a manner described in the prior art, and is not improved in the embodiment.
The acquisition of the opening degree of the accelerator pedal of the vehicle can be acquired by analyzing a signal acquired by the accelerator pedal opening degree sensor 9.
Similarly, the ambient temperature of the position of the vehicle can be obtained by analyzing and then acquiring the real-time temperature signal sensed by the ambient temperature sensor mounted on the vehicle.
And step S102, when the current residual capacity of the power battery 5 is lower than the first set capacity value, outputting a starting instruction for requesting the fuel cell system 1 to work, and enabling the fuel cell system 1 to start and enter an idling state based on the starting instruction.
The first set electric quantity value can be set according to the requirement, and is for example 50%, 40%, 30%, 20% and the like. The value may be set to a manner that the user is not free to adjust, or may be set to a manner that the user is free to adjust (e.g., the user enters into updating the value through the entertainment side). The manner in which the fuel cell system 1 is started by settling the start instruction is consistent with the related art.
The fuel cell system 1 remains in the shutdown state if it does not receive the start instruction.
In step S103, the basic generated power of the fuel cell system 1 is determined based on the current remaining capacity of the power cell 5.
The vehicle control unit 4 determines the basic generated power of the fuel cell system 1 according to a mapping relationship between the current remaining power of the power cell and the basic generated power of the fuel cell system, which is calibrated in advance.
And step S104, determining the required power offset of the driver based on the opening degree of an accelerator pedal of the vehicle.
The vehicle control unit 4 determines the driver required power offset according to a mapping relation between the accelerator pedal opening and the driver required power offset which are calibrated in advance.
Step S105, determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle.
Wherein, step S105 specifically includes:
multiplying the wheel speed by the wheel radius r to obtain the vehicle speed;
and determining the maximum heat dissipation power of the vehicle according to the mapping relation of the vehicle speed, the environment temperature and the maximum heat dissipation power of the vehicle which are calibrated in advance.
And step S106, determining the target generating power of the fuel cell system 1 according to the basic generating power, the driver required power offset and the maximum heat dissipation power.
Wherein, step S106 includes: the basic generated power of the fuel cell system 1 and the offset of the driver-demanded power are added to obtain a power intermediate value, and then the smaller value of the power intermediate value and the maximum heat dissipation power is determined as the target generated power.
And step S107, transmitting the target generated power to the fuel cell system 1, so that the fuel cell system in the idle state generates power according to the target generated power, and supplies power to the motor and the power battery.
In the embodiment of the invention, the specific steps of the fuel cell system 1 for generating power based on the target generated power are the same as those in the prior art. As shown in fig. 2, in order to implement the above method, the following subsystems or components are required to cooperate:
fuel cell system 1: and the generated power required by the whole vehicle controller 4 is achieved by controlling the reaction parameters. And a motor 2: and driving the vehicle to run. High-voltage direct-current line 3: the power battery 5, the fuel cell system 1 and the motor 2 are connected in parallel to form a high-voltage direct-current loop. And (4) the vehicle control unit: converting the signal of the wheel speed sensor 7 into the vehicle speed; converting the signal of the ambient temperature sensor 8 into an ambient temperature; controlling the starting and stopping of the fuel cell system 1 according to the electric quantity of the power battery 5; converting a signal of an accelerator pedal opening sensor 9 into an accelerator pedal opening; and determines the target generated power of the fuel cell system 1 based on the accelerator pedal opening, the ambient temperature, the vehicle speed, and the current remaining capacity of the power cell. The power battery 5: providing electric energy required by vehicle running; and feeds back the current remaining power of the vehicle controller 4. Low-voltage communication line 6: the normal communication between the vehicle control unit 4 and the fuel cell system 1, the power battery 5 and the motor 2 is ensured. The wheel speed sensor 7: the wheel speed of the vehicle is converted into an electrical signal. Ambient temperature sensor 8: the ambient temperature is converted into an electrical signal. Accelerator pedal opening degree sensor 9: the opening degree of the accelerator pedal is converted into an electric signal.
To sum up, in this embodiment, in order to implement the control method, an embodiment of the present invention provides an auxiliary power generation control system for an extended range fuel cell vehicle, including: a vehicle control unit 4; the system comprises a fuel cell system 1, a motor 2, a power battery 5, a wheel speed sensor 7 for acquiring the wheel speed of a vehicle, an environment temperature sensor 8 for acquiring the temperature of the environment where the vehicle is located, and an accelerator pedal opening sensor 9 for acquiring the opening of an accelerator pedal, wherein the fuel cell system 1, the motor 2, the power battery 5, the wheel speed sensor 7, the environment temperature sensor 8 and the accelerator pedal opening sensor 9 are connected with the vehicle control unit 4 through low-voltage wiring harnesses; the fuel cell system 1 is connected with the motor 2 and the power battery 5 through a high-voltage wire harness (high-voltage direct-current line 3), and the motor 2 and the power battery 5 are connected through the high-voltage wire harness (high-voltage direct-current line 3); the vehicle control unit 4 is specifically configured to: acquiring the current residual capacity of the power battery 5, the accelerator pedal opening of the vehicle acquired by an accelerator pedal opening sensor 9, the wheel speed acquired by a wheel speed sensor 7 and the environment temperature of the position of the vehicle acquired by an environment temperature sensor 8; when the current residual capacity of the power battery 5 is lower than the set electric quantity value, outputting a starting instruction for requesting the fuel cell system 1 to work, and enabling the fuel cell system 1 to start and enter an idling state based on the starting instruction; determining the basic generated power of the fuel cell system 1 based on the current remaining capacity of the power cell 5; determining a driver demand power offset based on an accelerator pedal opening of a vehicle; determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle; determining a target power generation power of the fuel cell system 1 according to the basic power generation power, the driver required power offset and the maximum heat dissipation power; and sending the target power generation power to the fuel cell system 1, so that the fuel cell system 1 in an idling state generates power according to the target power generation power and supplies power to the motor 2 and the power battery 5.
The above method of the present invention controls the operating time and the generated power of the fuel cell system 1 by determining the actual power demand of the driver, the current maximum heat dissipation power of the vehicle, and the electric quantity of the power cell 5. The vehicle has better dynamic property under the working conditions of low electric quantity and high power requirements (such as the working conditions of low electric quantity starting large throttle acceleration, low electric quantity climbing and the like), and simultaneously, the overheating risk of the fuel cell system 1 is reduced, and the service life of the fuel cell system is prolonged.
The embodiment of the present invention further provides a vehicle control unit 4, including:
the acquisition module is used for acquiring the current residual capacity of the power battery 4, the opening degree and the wheel speed of an accelerator pedal of the vehicle and the ambient temperature of the position of the vehicle;
the request module is used for outputting a starting instruction for requesting the fuel cell system 1 to work when the current residual capacity of the power battery 4 is lower than a set electric quantity value, so that the fuel cell system 1 is started based on the starting instruction and enters an idling state;
a first determination module for determining a basic generated power of the fuel cell system 1 based on a current remaining capacity of the power cell 5;
the second determination module is used for determining the offset of the power required by the driver based on the opening degree of an accelerator pedal of the vehicle;
the third determination module is used for determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
a fourth determination module, configured to determine a target generated power of the fuel cell system 1 according to the basic generated power, the driver-demanded power offset, and the maximum heat dissipation power;
and the sending module is used for sending the target power generation power to the fuel cell system 1, so that the fuel cell system in an idle state generates power according to the target power generation power and supplies power to the motor 2 and the power battery 5.
The embodiment of the invention also provides an extended range fuel cell automobile, which comprises the auxiliary power generation control system of the extended range fuel cell automobile.
The embodiments described above describe only some of the one or more embodiments of the present invention, but those skilled in the art will recognize that the invention can be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (8)
1. An auxiliary power generation control method of an extended range fuel cell vehicle is applied to a vehicle control unit (4) VCU, and is characterized by comprising the following steps:
acquiring the current residual capacity of a power battery (5), the opening degree and the wheel speed of an accelerator pedal of a vehicle and the ambient temperature of the position of the vehicle;
when the current residual capacity of the power battery (5) is lower than a first set capacity value, outputting a starting instruction for requesting the fuel cell system (1) to work, and enabling the fuel cell system (1) to start and enter an idling state based on the starting instruction;
determining the basic generated power of the fuel cell system (1) based on the current residual capacity of the power battery (5);
determining a driver demand power offset based on an accelerator pedal opening of a vehicle;
determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
determining a target generated power of the fuel cell system (1) according to the basic generated power, the driver required power offset and the maximum heat dissipation power;
and sending the target power generation power to a fuel cell system (1), so that the fuel cell system (1) in an idling state generates power according to the target power generation power, and supplies power to a motor (2) and a power battery (5).
2. The method according to claim 1, characterized in that the step of determining the base generated power of the fuel cell system (1) based on the current remaining capacity of the power cell (5) comprises:
determining the basic generating power of the fuel cell system (1) according to the mapping relation between the current residual capacity of the power cell (5) and the basic generating power of the fuel cell system (1) which is calibrated in advance;
the step of determining the driver required power offset amount based on the accelerator pedal opening degree of the vehicle includes:
and determining the power offset required by the driver according to a mapping relation between the opening of the accelerator pedal and the power offset required by the driver, which is calibrated in advance.
3. The method of claim 1, wherein the step of determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature in which the vehicle is located comprises:
multiplying the wheel speed by the wheel radius r to obtain the vehicle speed;
and determining the maximum heat dissipation power of the vehicle according to the mapping relation of the vehicle speed, the environment temperature and the maximum heat dissipation power of the vehicle which are calibrated in advance.
4. The method according to claim 1, wherein the step of determining a target generated power of the fuel cell system (1) based on the base generated power, the driver-demanded power offset, and the maximum heat dissipation power includes:
adding the basic generating power of the fuel cell system (1) and the offset of the power required by the driver to obtain a power intermediate value, and determining the smaller value of the power intermediate value and the maximum heat dissipation power as the target generating power.
5. The method of claim 1, further comprising:
when the current residual electric quantity of the power battery (5) is higher than a second set electric quantity value, outputting a shutdown instruction for requesting the fuel cell system (1) to stop working, and enabling the fuel cell system (1) to be shut down based on the shutdown instruction; the second set electric quantity value is larger than the first set electric quantity value.
6. An auxiliary power generation control system for an extended range fuel cell vehicle, comprising:
a vehicle control unit (4);
the system comprises a fuel cell system (1), a motor (2), a power cell (5), a wheel speed sensor, an environment temperature sensor (8) and an accelerator pedal opening sensor (9), wherein the fuel cell system is connected with the whole vehicle controller (4) through a low-voltage wire harness; the fuel cell system (1) is connected with the motor (2) and the power battery (5) through a high-voltage wiring harness, and the motor (2) and the power battery (5) are connected through the high-voltage wiring harness;
the vehicle control unit (4) is specifically configured to:
acquiring the current residual electric quantity of a power battery (5), the opening of an accelerator pedal of a vehicle acquired by an accelerator pedal opening sensor (9), the wheel speed acquired by a wheel speed sensor and the ambient temperature of the position of the vehicle acquired by an ambient temperature sensor (8);
when the current residual capacity of the power battery (5) is lower than a first set capacity value, outputting a starting instruction for requesting the fuel cell system (1) to work, and enabling the fuel cell system (1) to start and enter an idling state based on the starting instruction;
determining the basic generated power of the fuel cell system (1) based on the current residual capacity of the power battery (5);
determining a driver demand power offset based on an accelerator pedal opening of a vehicle;
determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
determining a target generated power of the fuel cell system (1) according to the basic generated power, the driver required power offset and the maximum heat dissipation power;
and sending the target power generation power to a fuel cell system (1), so that the fuel cell system (1) in an idling state generates power according to the target power generation power, and supplies power to a motor (2) and a power battery (5).
7. A vehicle control unit (4), comprising:
the acquisition module is used for acquiring the current residual capacity of the power battery (5), the opening degree and the wheel speed of an accelerator pedal of the vehicle and the ambient temperature of the position of the vehicle;
the request module is used for outputting a starting instruction for requesting the fuel cell system (1) to work when the current residual capacity of the power battery (5) is lower than a set electric quantity value, so that the fuel cell system (1) is started based on the starting instruction and enters an idling state;
a first determination module for determining a base generated power of the fuel cell system (1) based on a current remaining capacity of the power cell (5);
the second determination module is used for determining the offset of the power required by the driver based on the opening degree of an accelerator pedal of the vehicle;
the third determination module is used for determining the maximum heat dissipation power of the vehicle based on the wheel speed of the vehicle and the ambient temperature of the vehicle;
a fourth determination module for determining a target generated power of the fuel cell system (1) based on the base generated power, the driver-demanded power offset, and the maximum heat dissipation power;
and the sending module is used for sending the target generated power to the fuel cell system (1), so that the fuel cell system (1) in an idling state generates power according to the target generated power and supplies power to the motor (2) and the power battery (5).
8. An extended range fuel cell vehicle characterized by comprising the auxiliary power generation control system of the extended range fuel cell vehicle according to claim 6.
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