CN113752920A - Energy management control method and device for vehicle hybrid power system - Google Patents

Energy management control method and device for vehicle hybrid power system Download PDF

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Publication number
CN113752920A
CN113752920A CN202111261761.9A CN202111261761A CN113752920A CN 113752920 A CN113752920 A CN 113752920A CN 202111261761 A CN202111261761 A CN 202111261761A CN 113752920 A CN113752920 A CN 113752920A
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fuel cell
storage battery
energy
whole vehicle
output energy
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CN113752920B (en
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郑志强
戴丽君
刘然
方川
张国强
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Beijing Sinohytec Co Ltd
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Beijing Sinohytec Co Ltd
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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
    • B60L58/40—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
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/12—Speed
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • 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
    • B60L2250/00—Driver interactions
    • B60L2250/26—Driver interactions by pedal actuation
    • 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

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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)

Abstract

The invention provides an energy management control method of a vehicle hybrid power system, belongs to the technical field of fuel cell engines, and solves the problem of poor fuel economy of the whole vehicle caused by the fact that the optimal operation characteristics of a fuel cell are not considered in the prior art. The method comprises the following steps: acquiring the opening degree of an accelerator pedal, the opening degree of a brake pedal and the speed of the whole vehicle, and determining the required power of the whole vehicleP req(ii) a Determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC‑minMaximum output powerP FC‑maxAnd output power at optimum fuel cell efficiencyP FC‑opt(ii) a According to the required power of the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC‑optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC‑min~P FC‑maxAnd the output energy of the storage battery is the least. The energy utilization efficiency of the whole vehicle system is optimized.

Description

Energy management control method and device for vehicle hybrid power system
Technical Field
The invention relates to the technical field of fuel cell engines, in particular to an energy management control method and device of a vehicle hybrid power system.
Background
The fuel cell has the advantages of high energy conversion efficiency, zero or near zero emission, smooth operation, no noise, wide fuel acquisition range, high reliability and the like, and is called as an ideal vehicle energy source. However, the vehicle is equipped with only a fuel cell, and the disadvantages of slow power response, long start-up time, no way to recover braking energy, and the like occur. At present, a fuel cell engine and a storage battery form a composite energy system, which is an effective technical means for overcoming the defect of single energy. For the composite energy system, the energy management strategy is the core of the whole vehicle control, namely, on the basis of meeting the power performance of the whole vehicle, the efficient distribution of energy between the fuel cell and the storage battery is realized as far as possible.
At present, the energy management and control of the composite energy system are based on the structural characteristics of the fuel cell, reasonably distribute the required power of the whole vehicle between the fuel cell and the storage battery, and meet other requirements of the required power of the whole vehicle. For example, patent CN108001275A discloses a fuel cell electric vehicle electric power coupling driving system and a control method thereof, which obtains a logical relationship between a vehicle required power and a fuel cell engine rated power by calculating and solving the vehicle required power, and further performs power distribution between a fuel cell and a power cell.
However, the energy management and control of the hybrid energy system does not consider the optimal operating characteristics of the fuel cell, resulting in poor fuel economy of the whole vehicle.
Disclosure of Invention
The embodiment of the invention aims to provide an energy management control method of a vehicle hybrid power system, which is used for solving the problem of poor fuel economy of the whole vehicle caused by the fact that the optimal operation characteristic of a fuel cell is not considered in the prior art.
In one aspect, an embodiment of the present invention provides an energy management control method for a vehicle hybrid system, including the following steps:
acquiring the opening degree of an accelerator pedal, the opening degree of a brake pedal and the speed of the whole vehicle, and determining the required power of the whole vehicleP req；
Determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt；
According to the required power of the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC-optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC-min~P FC-maxAnd the output energy of the storage battery is the least.
The beneficial effects of the above technical scheme are as follows: based on basic vehicle state quantities such as accelerator pedal opening, brake pedal opening, vehicle speed, battery SOC (state of charge) state and the like, on the basis of meeting the vehicle dynamic property, the charging and discharging characteristics of the battery and the polarization curve characteristics of the fuel cell are fully considered, the characteristics of the driving working condition are considered, the required power of the whole vehicle is reasonably distributed between the fuel cell and the battery, the efficiency of the whole vehicle system is optimized, and the fuel economy is improved.
Based on the further improvement of the method, the working condition of the whole vehicle comprises at least one of a starting working condition, a driving working condition and a deceleration braking working condition.
The beneficial effects of the above further improved scheme are: the whole vehicle can meet various conditions in the actual operation working condition, and can be divided into the following 3 running working conditions, namely, a starting working condition, a driving working condition (including constant speed, acceleration and climbing working conditions) and a deceleration/braking working condition for simple and convenient differentiation.
Further, when the working condition of the whole vehicle is a starting working condition, the step of dynamically planning the output energy of the fuel cell and the storage battery and determining the optimal working point further comprises the following steps:
controlling the storage battery to start and outputting energy to the fuel cell according to rated voltage or current;
monitoring the output power or current of the fuel cell until the output power or current reaches a rated value, and judging that the fuel cell is started;
after the fuel cell is started, the storage battery is shut down, and the fuel cell is controlled to be in a normal stateP FC-optAnd outputting the energy to serve as an optimal working point to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the starting working condition.
The beneficial effects of the above further improved scheme are: the dynamic programming method of the output energy of the fuel cell and the storage battery under the starting working condition is limited. During start-up, the fuel cell requires a certain start-up time and power response, and additionally during vehicle traction, power at lower vehicle speeds can lead to fuel cell inefficiencies. Therefore, under the starting working condition, the storage battery provides energy for the fuel cell to start the fuel cell to work.
Further, when the working condition of the whole vehicle is a driving working condition, the step of dynamically planning the output energy of the fuel cell and the storage battery and determining the optimal working point further comprises the following steps:
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not it is greater than the maximum output powerP FC-maxIf it is greater thanP FC-maxControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery isP req- P FC-optAs the optimal working point, the output energy of the fuel cell and the storage battery under the driving working condition is completedOtherwise, executing the next step;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqOtherwise, the output energy of the fuel cell is controlled to beP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
The beneficial effects of the above further improved scheme are: a dynamic programming method for the output energy of fuel cell and accumulator under drive condition is disclosed to make the fuel cell work at optimum efficiency.
Further, when the working condition of the whole vehicle is a driving working condition, the step of dynamically planning the output energy of the fuel cell and the storage battery and determining the optimal working point further comprises the following steps:
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 and is taken as the optimal working point, and whether the SOC state of the storage battery is lower than the limit value SOC is further judgedminIf it is lower, and controlling the fuel cell to provideP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery, and finishing dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than the maximum output powerP FC-maxIf it is less thanP FC-maxControlling the output energy of the fuel cell toP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqUntil the SOC state of the battery reaches SOCminOtherwise, the output energy of the fuel cell is controlled toP FC-maxThe output energy of the storage battery isP FC-max - P reqAnd as the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
The beneficial effects of the above further improved scheme are: and another dynamic programming method for the output energy of the fuel cell and the storage battery under the driving working condition is provided, so that the fuel cell works at the optimal efficiency.
Further, when the working condition of the whole vehicle is a deceleration braking working condition, the step of dynamically planning the output energy of the fuel cell and the storage battery and determining the optimal working point further comprises the following steps:
and controlling the output energy of the fuel cell and the storage battery to be 0 as an optimal working point, and controlling the storage battery to recover the braking energy to finish the dynamic planning of the output energy of the fuel cell and the storage battery under the deceleration braking working condition.
The beneficial effects of the above further improved scheme are: a dynamic programming method for the output energy of the fuel cell and the storage battery under the deceleration braking working condition is provided, so that the power consumption of the fuel cell and the storage battery is minimum.
In another aspect, an embodiment of the present invention provides an energy management control apparatus of a hybrid system of a vehicle, including:
the information acquisition equipment is used for acquiring the opening degree of an accelerator pedal, the opening degree of a brake pedal and the speed of the whole vehicle and determining the required power of the whole vehicleP req(ii) a Acquiring the working condition of the whole vehicle and the SOC state of the storage battery; and, the power required by the whole vehicleP reqThe working condition of the whole vehicle and the SOC state of the storage battery are sent to the energy management controller;
an energy management controller for determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt(ii) a And according to the received power demand of the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC-optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC-min~P FC-maxAnd the output energy of the storage battery is minimum; controlling the fuel cell or the storage battery to start and charge and discharge according to the optimal operating point;
a fuel cell for performing start-up or charge and discharge according to control of the energy management controller;
and the storage battery is used for executing starting or charging and discharging according to the control of the energy management controller.
The beneficial effect of adopting the above further improved scheme is: based on basic vehicle state quantities such as accelerator pedal opening, brake pedal opening, vehicle speed, battery SOC (state of charge) state and the like, on the basis of meeting the vehicle dynamic property, the charging and discharging characteristics of the battery and the polarization curve characteristics of the fuel cell are fully considered, the characteristics of the driving working condition are considered, the required power of the whole vehicle is reasonably distributed between the fuel cell and the battery, the efficiency of the whole vehicle system is optimized, and the fuel economy is improved.
Based on a further improvement of the above apparatus, the information acquiring device further includes:
the displacement sensors are respectively arranged on the surfaces of an accelerator pedal and a brake pedal of the whole vehicle, are used for acquiring the opening degree of the accelerator pedal and the opening degree of the brake pedal of the whole vehicle and sending the opening degrees to the information processing unit;
the speed sensor is arranged at the rotor of the engine of the whole vehicle and used for acquiring the speed of the whole vehicle and sending the speed to the information processing unit;
the storage battery SOC state sensor is used for acquiring the SOC state of a storage battery on the whole vehicle and sending the SOC state to the information processing unit;
the information processing unit is used for determining the required power of the whole vehicle according to the received accelerator pedal opening, brake pedal opening and vehicle speed of the whole vehicleP req(ii) a Identifying the working condition of the whole vehicle according to a whole vehicle control instruction input by a user; and, the power required by the whole vehicleP reqAnd the working condition of the whole vehicle and the SOC state of the storage battery are sent to the energy management controller.
The beneficial effect of adopting the above further improved scheme is: the structure and the function of the information acquisition equipment are limited, and a foundation is laid for reasonably distributing the required power of the whole vehicle between the fuel cell and the storage battery.
Further, when the working condition of the whole vehicle is a non-starting working condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery through the following steps:
judging the power demand of the whole vehicleP reqWhether less than 0; if the output energy of the fuel cell and the storage battery is less than 0, controlling the output energy of the fuel cell and the storage battery to be 0 as an optimal working point, and controlling the storage battery to recover the braking energy to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the deceleration braking working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqCharging the storage battery with the energy ofCompleting the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not it is greater than the maximum output powerP FC-maxIf it is greater thanP FC-maxControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery isP req- P FC-optAs the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed, otherwise, the next step is executed;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqOtherwise, the output energy of the fuel cell is controlled to beP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
The beneficial effect of adopting the above further improved scheme is: under the deceleration braking working condition, the power consumption of the fuel cell and the storage battery is minimum, and the fuel cell works at the optimal efficiency under the driving working condition.
Further, when the working condition of the whole vehicle is a non-starting working condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery through the following steps:
judging the power demand of the whole vehicleP reqWhether the output energy is less than 0 or not, if the output energy is less than 0, the output energy of the fuel cell and the output energy of the storage battery are both controlled to be 0 and used as an optimal working point, the storage battery is controlled to recover the braking energy, and the dynamic planning of the output energy of the fuel cell and the output energy of the storage battery under the deceleration braking working condition is completed; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 and is taken as the optimal working point, and whether the SOC state of the storage battery is lower than the limit value SOC is further judgedminIf it is lower, and controlling the fuel cell to provideP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery, and finishing dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than the maximum output powerP FC-maxIf it is less thanP FC-maxControlling the output energy of the fuel cell toP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqUntil the SOC state of the battery reaches SOCminOtherwise, the output energy of the fuel cell is controlled toP FC-maxThe output energy of the storage battery isP FC-max - P reqAnd as the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
The beneficial effect of adopting the above further improved scheme is: under the deceleration braking working condition, the power consumption of the fuel cell and the storage battery is minimum, and the fuel cell works at the optimal efficiency under the driving working condition.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
FIG. 1 is a schematic step diagram illustrating a method of energy management control of a vehicle hybrid system according to an embodiment 1;
FIG. 2 is a schematic diagram showing a vehicle hybrid system composition of embodiment 1;
FIG. 3 is a schematic diagram of an energy management control method according to an embodiment 2 under a non-start condition;
FIG. 4 is a schematic diagram showing the composition of an energy management control apparatus of a hybrid system of a vehicle according to embodiment 3.
Reference numerals:
P req-vehicle power demand;P FC-the output power of the fuel cell;
P bat-the output power of the accumulator;P FC-min-minimum output power of the fuel cell;
P FC-max-maximum output power of the fuel cell;
P FC-opt-output power at optimum fuel cell efficiency; SOC-battery state of charge;
SOCmin-a battery SOC lower limit; SOCmax-battery SOC upper limit.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by 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 disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
In order to more clearly describe the present invention, the key terms involved are first introduced.
A fuel cell: the fuel cell engine, also called fuel cell, works on the principle that the electrochemical reaction of hydrogen and oxygen is realized to generate electric energy, and then the electric energy is supplied to an electric drive system.
A storage battery: is a device for directly converting chemical energy into electric energy, and is a battery designed to be rechargeable, and the battery is recharged through reversible chemical reactions. Generally referred to as a lead-acid battery, which is a type of secondary battery.
Energy management control strategy: on the premise of meeting the vehicle running requirement, the energy-saving potential of the design scheme is fully exerted by using the energy-saving principle and technology of the new energy vehicle according to the performance characteristics of key components and the vehicle running condition, so that the whole vehicle achieves energy efficiency optimization.
Example 1
An embodiment of the invention discloses an energy management control method of a vehicle hybrid system, which comprises the following steps as shown in FIG. 1:
s1, acquiring the opening degree of an accelerator pedal, the opening degree of a brake pedal and the speed of the whole vehicle, and determining the required power of the whole vehicleP req；
S2, determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt；
S3, power demand according to the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC-optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC-min~P FC-maxAnd the output energy of the storage battery is the least.
The vehicle hybrid system is shown in fig. 2.
Compared with the prior art, the energy management control method of the vehicle hybrid power system provided by the embodiment is based on the basic vehicle state quantities such as the accelerator pedal opening, the brake pedal opening, the vehicle speed and the storage battery SOC state, fully considers the charge-discharge characteristic and the polarization curve characteristic of the storage battery on the basis of meeting the vehicle dynamic property, gives consideration to the characteristics of the driving working condition, and reasonably distributes the required power of the whole vehicle between the fuel battery and the storage battery, so that the efficiency of the whole vehicle system is optimal, and the fuel economy is improved.
Example 2
The improvement is made on the basis of embodiment 1, and the method for acquiring the accelerator opening, the brake opening and the vehicle speed of the whole vehicle in step S1 can be seen from embodiment 4.
Optionally, the required power of the whole vehicle is determinedP reqThe method can adopt a trained neural network in the prior art or calibrated accelerator pedal opening degree-brake pedal opening degree-vehicle speed-vehicle required powerP reqAnd (4) obtaining a curve through an identification method. As will be appreciated by those skilled in the art.
In step S2, the characteristic curve of the fuel cell on the vehicle may be referred to the factory specifications of the fuel cell, and the minimum output power of the fuel cell may be determined by the characteristic curveP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt. Output power at optimum fuel cell efficiencyP FC-optNamely the minimum point of the total internal resistance of the electric pile.
Preferably, the working condition of the whole vehicle in step S3 includes at least one of a starting working condition, a driving working condition (including a constant speed working condition, an accelerating working condition and a climbing working condition), and a deceleration braking working condition.
Preferably, when the operating condition of the whole vehicle is a starting operating condition, the step of dynamically planning the output energy of the fuel cell and the output energy of the storage battery in step S3, and the step of determining the optimal operating point may further include:
s31, controlling the battery to start and outputting energy to the fuel cell according to the rated voltage or current;
s32, monitoring the output power or current of the fuel cell until the output power or current reaches a rated value, and judging that the fuel cell is started;
s33, after the fuel cell is started, the storage battery is closed, and the fuel cell is controlled to be startedP FC-optAnd outputting the energy to serve as an optimal working point to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the starting working condition.
Fuel cell electric vehicles require a certain start-up time and power response from the fuel cell during start-up, and additionally, power at lower vehicle speeds may result in fuel cell inefficiencies during vehicle traction. Under the starting working condition, the storage battery provides energy for the fuel cell to start the fuel cell to work.
Preferably, when the operating condition of the whole vehicle is the driving operating condition, as shown in fig. 3, the step of dynamically planning the output energy of the fuel cell and the battery in step S3, and the step of determining the optimal operating point further includes:
s34, judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the battery is 0 as the optimum operating point (efficiency optimum), and the fuel cell is controlled to supplyP FC-opt - P reqThe energy (residual energy) of the fuel cell is used for charging the storage battery, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed; otherwise, executing the next step;
s35, judging the power demand of the whole vehicleP reqWhether or not it is greater than the maximum output powerP FC-maxIf it is greater thanP FC-maxControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery isP req- P FC-optAs the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed, otherwise, the next step is executed;
s36, judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqOtherwise, the output energy of the fuel cell is controlled to beP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
Preferably, when the operating condition of the whole vehicle is the driving operating condition, the step S3 of dynamically planning the output energy of the fuel cell and the battery, and the step of determining the optimal operating point may further include:
s34', judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 and is used as an optimal working point (the efficiency is optimal), and whether the SOC state of the storage battery is lower than a limit value SOC is further judgedminIf it is lower, and controlling the fuel cell to provideP FC-opt - P reqCharging the battery with the remaining energy (charging the battery under the condition that the vehicle drive is satisfied) until the SOC state of the battery reaches the SOCminStopping charging the storage battery, and if the charging voltage is not lower than the preset value, driving the vehicle to run by the fuel cell alone; otherwise, executing the next step;
s35', judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery, and finishing dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition; otherwise, executing the next step;
s36', judging the power demand of the whole vehicleP reqWhether or not less than the maximum output powerP FC-maxIf it is less thanP FC-maxControlling the output energy of the fuel cell toP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqUntil the SOC state of the battery reaches SOCminOtherwise, the output energy of the fuel cell is controlled toP FC-maxThe output energy of the storage battery isP FC-max - P reqAnd as the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed. Because the SOC of the back of the storage battery is higher, the corresponding working condition at the moment is generally an acceleration working condition or a climbing working condition, the duration time is shorter, and the storage battery cannot have over discharge.
The two methods can ensure that the output energy distribution of the fuel cell and the storage battery is optimal under the driving working condition.
Preferably, when the vehicle is in the deceleration braking condition, in step S3, the step of dynamically planning the output energy of the fuel cell and the battery, and the step of determining the optimal operating point may further include:
and S37, controlling the output energy of the fuel cell and the storage battery to be 0 as an optimal working point, and controlling the storage battery to recover the braking energy to finish the dynamic planning of the output energy of the fuel cell and the storage battery under the deceleration braking working condition.
When the method is implemented, the method is based on a control strategy of a logic threshold, takes the fuel cell as a main power source, controls the fuel cell in such a way that the fuel cell falls in an optimal working interval according to a control principle, and calibrates the minimum output power of the fuel cell based on a characteristic curve of the fuel cellP FC-minMaximum output powerP FC-maxAnd fuel cell efficiency optimum output efficiencyP FC-optThe output power of the fuel cell is required to always fall within the minimum output power of the fuel cellP FC-minAnd maximum output powerP FC-maxWithin (i.e. the range of (i.e.)P FC-min<P FC<P FC-max) And on this basis, the fuel cell output power is made to fall as far as possible at its efficiency optimum. The storage battery is used as an auxiliary energy system, plays a role in power balance, and stores the energy recovered by the storage battery in the braking and decelerating processes of the vehicle.
Compared with embodiment 1, the method provided by the embodiment has the following beneficial effects:
1. the output power between the fuel cell and the storage battery can be reasonably distributed on the premise of meeting the power requirement;
2. the hydrogen consumption of hundreds of kilometers can be reduced, and the fuel economy is improved.
Example 3
In another embodiment of the present invention, an energy management control apparatus of a hybrid system for a vehicle corresponding to the method of embodiment 1 is disclosed, which includes an information acquisition device, an energy management controller, a fuel cell, and a battery, as shown in fig. 4. The output end of the information acquisition equipment is connected with the input end of the energy management controller, and the output end of the energy management controller is connected with the control ends of the fuel cell and the storage battery.
The information acquisition equipment is used for acquiring the opening degree of an accelerator pedal, the opening degree of a brake pedal and the speed of the whole vehicle and determining the required power of the whole vehicleP req(ii) a Acquiring the working condition of the whole vehicle and the SOC state of the storage battery; and, the power required by the whole vehicleP reqAnd the working condition of the whole vehicle and the SOC state of the storage battery are sent to the energy management controller.
An energy management controller for determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt(ii) a And according to the received power demand of the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC-optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC-min~P FC-maxAnd the output energy of the storage battery is minimum; and controlling the fuel cell or the battery to perform starting and charging and discharging according to the optimal operating point.
And a fuel cell for performing start-up or charge and discharge according to control of the energy management controller.
And the storage battery is used for executing starting or charging and discharging according to the control of the energy management controller.
Compared with the prior art, the energy management control device of the vehicle hybrid power system provided by the embodiment fully considers the charge-discharge characteristic and the polarization curve characteristic of the fuel cell and the characteristics of the running working condition on the basis of meeting the vehicle dynamic property based on the basic vehicle state quantities such as the accelerator pedal opening degree, the brake pedal opening degree, the vehicle speed, the battery SOC state and the like, reasonably distributes the required power of the whole vehicle between the fuel cell and the battery, optimizes the efficiency of the whole vehicle system and improves the fuel economy.
Example 4
An energy management control apparatus for a vehicle hybrid system is improved over embodiment 3 and corresponds to the method of embodiment 2. The information acquisition equipment further comprises a displacement sensor, a speed sensor, a storage battery SOC state sensor and an information processing unit. The output ends of the displacement sensor, the speed sensor and the storage battery SOC state sensor are connected with the input end of the information processing unit.
And the displacement sensors are respectively arranged on the surfaces of an accelerator pedal and a brake pedal of the whole vehicle, are used for acquiring the opening degree of the accelerator pedal and the opening degree of the brake pedal of the whole vehicle and sending the acquired opening degrees to the information processing unit.
And the speed sensor is arranged at the rotor of the engine of the whole vehicle and used for acquiring the speed of the whole vehicle and sending the speed to the information processing unit.
And the storage battery SOC state sensor is used for acquiring the SOC state of the storage battery on the whole vehicle and sending the SOC state to the information processing unit.
The information processing unit is used for determining the required power of the whole vehicle according to the received accelerator pedal opening, brake pedal opening and vehicle speed of the whole vehicleP req(ii) a Identifying the working condition of the whole vehicle according to a whole vehicle control instruction input by a user; and, the power required by the whole vehicleP reqAnd the working condition of the whole vehicle and the SOC state of the storage battery are sent to the energy management controller.
Preferably, when the working condition of the whole vehicle is a starting working condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery through the following steps:
SS1, controlling the battery to start and outputting energy to the fuel cell according to the rated voltage or current;
SS2, monitoring the output power or current of the fuel cell until the output power or current reaches a rated value, and judging that the fuel cell is started;
SS3 after starting fuel cell, turning off accumulator and controlling fuel cell to startP FC-optAnd outputting the energy to serve as an optimal working point to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the starting working condition.
Preferably, when the working condition of the whole vehicle is a non-starting working condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery through the following steps:
SS4 judging power demand of whole vehicleP reqWhether less than 0; if the output energy of the fuel cell and the storage battery is less than 0, controlling the output energy of the fuel cell and the storage battery to be 0 as an optimal working point, and controlling the storage battery to recover the braking energy to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the deceleration braking working condition; otherwise, executing the next step;
SS5 judging power demand of whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed; otherwise, executing the next step;
SS6 judging power demand of whole vehicleP reqWhether or not it is greater than the maximum output powerP FC-maxIf it is greater thanP FC-maxControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery isP req- P FC-optAs the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed, otherwise, the next step is executed;
SS7 judging power demand of whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqOtherwise, the output energy of the fuel cell is controlled to beP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqOf energy ofAnd charging the storage battery to finish the dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition.
Preferably, when the working condition of the whole vehicle is a non-starting working condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery through the following steps:
SS 4' judging the power demand of the whole vehicleP reqWhether the output energy is less than 0 or not, if the output energy is less than 0, the output energy of the fuel cell and the output energy of the storage battery are both controlled to be 0 and used as an optimal working point, the storage battery is controlled to recover the braking energy, and the dynamic planning of the output energy of the fuel cell and the output energy of the storage battery under the deceleration braking working condition is completed; otherwise, executing the next step;
SS 5' judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 and is taken as the optimal working point, and whether the SOC state of the storage battery is lower than the limit value SOC is further judgedminIf it is lower, and controlling the fuel cell to provideP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery; otherwise, executing the next step;
SS 6' judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery, and finishing dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition; otherwise, executing the next step;
SS 7' judging the power demand of the whole vehicleP reqWhether or not less than the maximum output powerP FC-maxIf it is less thanP FC-maxControl combustion ofThe output energy of the material cell isP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqUntil the SOC state of the battery reaches SOCminOtherwise, the output energy of the fuel cell is controlled toP FC-maxThe output energy of the storage battery isP FC-max - P reqAnd as the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
Compared with embodiment 3, the device provided by the embodiment has the following beneficial effects:
1. the output power between the fuel cell and the storage battery can be reasonably distributed on the premise of meeting the power requirement;
2. the hydrogen consumption of hundreds of kilometers can be reduced, and the fuel economy is improved.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, the practical application, or improvements made to the prior art, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. A method of energy management control for a vehicle hybrid powertrain system, comprising the steps of:
acquiring the opening degree of an accelerator pedal, the opening degree of a brake pedal and the speed of the whole vehicle, and determining the required power of the whole vehicleP req；
Determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt；
According to the required power of the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC-optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC-min~P FC-maxAnd the output energy of the storage battery is the least.
2. The energy management control method according to claim 1, wherein the working condition of the whole vehicle comprises at least one of a starting working condition, a driving working condition and a deceleration braking working condition.
3. The energy management control method according to claim 2, wherein when the vehicle is in a starting condition, the step of dynamically planning the output energy of the fuel cell and the storage battery, and the step of determining the optimal operating point further comprises:
controlling the storage battery to start and outputting energy to the fuel cell according to rated voltage or current;
monitoring the output power or current of the fuel cell until the output power or current reaches a rated value, and judging that the fuel cell is started;
after the fuel cell is started, the storage battery is shut down, and the fuel cell is controlled to be in a normal stateP FC-optAnd outputting the energy to serve as an optimal working point to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the starting working condition.
4. The energy management control method according to claim 2 or 3, wherein when the vehicle is in a driving condition, the step of dynamically planning the output energy of the fuel cell and the storage battery, and the step of determining the optimal operating point further comprises:
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not it is greater than the maximum output powerP FC-maxIf it is greater thanP FC-maxControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery isP req- P FC-optAs the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed, otherwise, the next step is executed;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqOtherwise, the output energy of the fuel cell is controlled to beP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
5. The energy management control method according to claim 2 or 3, wherein when the vehicle is in a driving condition, the step of dynamically planning the output energy of the fuel cell and the storage battery, and the step of determining the optimal operating point further comprises:
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 asThe optimal working point and further judges whether the SOC state of the storage battery is lower than a limit value SOCminIf it is lower, and controlling the fuel cell to provideP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery, and finishing dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than the maximum output powerP FC-maxIf it is less thanP FC-maxControlling the output energy of the fuel cell toP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqUntil the SOC state of the battery reaches SOCminOtherwise, the output energy of the fuel cell is controlled toP FC-maxThe output energy of the storage battery isP FC-max - P reqAnd as the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
6. The energy management control method according to claim 2 or 3, wherein when the vehicle is in a deceleration braking condition, the step of dynamically planning the output energy of the fuel cell and the storage battery and determining the optimal operating point further comprises:
and controlling the output energy of the fuel cell and the storage battery to be 0 as an optimal working point, and controlling the storage battery to recover the braking energy to finish the dynamic planning of the output energy of the fuel cell and the storage battery under the deceleration braking working condition.
7. An energy management control apparatus of a vehicle hybrid system, characterized by comprising:
an information acquisition device for acquiring accelerator pedal opening, brake pedal opening, and vehicle speed of the entire vehicle
Acquiring and determining the required power of the whole vehicleP req(ii) a Acquiring the working condition of the whole vehicle and the SOC state of the storage battery; and, the power required by the whole vehicleP reqThe working condition of the whole vehicle and the SOC state of the storage battery are sent to the energy management controller;
an energy management controller for determining the minimum output power of the fuel cell according to the characteristic curve of the fuel cell on the whole vehicleP FC-minMaximum output powerP FC-maxAnd output power at optimum fuel cell efficiencyP FC-opt(ii) a And according to the received power demand of the whole vehicleP reqCombined with fuel cell efficiency optimum output powerP FC-optDynamically planning the output energy of the fuel cell and the storage battery according to the working condition of the whole vehicle and the SOC state of the storage battery, and determining the optimal working point so that the output power of the fuel cell is always between the working condition of the whole vehicle and the SOC state of the storage batteryP FC-min~P FC-maxAnd the output energy of the storage battery is minimum; controlling the fuel cell or the storage battery to start and charge and discharge according to the optimal operating point;
a fuel cell for performing start-up or charge and discharge according to control of the energy management controller;
and the storage battery is used for executing starting or charging and discharging according to the control of the energy management controller.
8. The energy management control apparatus according to claim 7, wherein the information acquisition device further includes:
the displacement sensors are respectively arranged on the surfaces of an accelerator pedal and a brake pedal of the whole vehicle, are used for acquiring the opening degree of the accelerator pedal and the opening degree of the brake pedal of the whole vehicle and sending the opening degrees to the information processing unit;
the speed sensor is arranged at the rotor of the engine of the whole vehicle and used for acquiring the speed of the whole vehicle and sending the speed to the information processing unit;
the storage battery SOC state sensor is used for acquiring the SOC state of a storage battery on the whole vehicle and sending the SOC state to the information processing unit;
the information processing unit is used for determining the required power of the whole vehicle according to the received accelerator pedal opening, brake pedal opening and vehicle speed of the whole vehicleP req(ii) a Identifying the working condition of the whole vehicle according to a whole vehicle control instruction input by a user; and, the power required by the whole vehicleP reqAnd the working condition of the whole vehicle and the SOC state of the storage battery are sent to the energy management controller.
9. The energy management control device according to claim 7 or 8, wherein when the vehicle is in a non-starting condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery by the following steps:
judging the power demand of the whole vehicleP reqWhether less than 0; if the output energy of the fuel cell and the storage battery is less than 0, controlling the output energy of the fuel cell and the storage battery to be 0 as an optimal working point, and controlling the storage battery to recover the braking energy to complete the dynamic planning of the output energy of the fuel cell and the storage battery under the deceleration braking working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not it is greater than the maximum output powerP FC-maxIf it is greater thanP FC-maxControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery isP req- P FC-optAs the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed, otherwise, the next step is executed;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqOtherwise, the output energy of the fuel cell is controlled to beP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqThe energy of the energy storage battery is charged, and the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
10. The energy management control device according to claim 7 or 8, wherein when the vehicle is in a non-starting condition, the energy management controller dynamically plans the output energy of the fuel cell and the storage battery by the following steps:
judging the power demand of the whole vehicleP reqWhether the output energy is less than 0 or not, if the output energy is less than 0, the output energy of the fuel cell and the output energy of the storage battery are both controlled to be 0 and used as an optimal working point, the storage battery is controlled to recover the braking energy, and the dynamic planning of the output energy of the fuel cell and the output energy of the storage battery under the deceleration braking working condition is completed; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than minimum output powerP FC-min(ii) a If less thanP FC-minControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the maximumThe working point is good, and whether the SOC state of the storage battery is lower than a limit value SOC is further judgedminIf it is lower, and controlling the fuel cell to provideP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqOutput power less than optimum fuel cell efficiencyP FC-optIf it is less thanP FC-optControlling the output energy of the fuel cell toP FC-optThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-opt - P reqUntil the SOC state of the battery reaches SOCminStopping charging the storage battery, and finishing dynamic planning of the output energy of the fuel battery and the storage battery under the driving working condition; otherwise, executing the next step;
judging the power demand of the whole vehicleP reqWhether or not less than the maximum output powerP FC-maxIf it is less thanP FC-maxControlling the output energy of the fuel cell toP FC-maxThe output energy of the storage battery is 0 as the optimum working point, and the fuel cell is controlled to supplyP FC-max - P reqUntil the SOC state of the battery reaches SOCminOtherwise, the output energy of the fuel cell is controlled toP FC-maxThe output energy of the storage battery isP FC-max - P reqAnd as the optimal working point, the dynamic planning of the output energy of the fuel cell and the storage battery under the driving working condition is completed.
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CN115593278A (en) * 2022-12-13 2023-01-13 中国第一汽车股份有限公司（Cn） Mode switching control method for power system of fuel cell vehicle, vehicle and storage medium

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