CN116022035B - Power system of fuel cell heavy truck, energy management method and device - Google Patents
Power system of fuel cell heavy truck, energy management method and device Download PDFInfo
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Abstract
The invention belongs to the technical field of new energy automobiles, and particularly relates to a power system of a fuel cell heavy truck, an energy management method and a device, wherein the power system comprises the steps of acquiring a power cell SOC (state of charge) state, power cell charging limiting power and fuel cell rated power in a driving state; if the SOC of the power battery is smaller than the SOCa in the first electric quantity state, determining the output power of the fuel battery in the current load-changing period according to the magnitude relation among the set power, the power battery charging limit power and the rated power of the fuel battery; setting the power as the sum of the average power of the whole vehicle and the compensation power in the last control period; the compensation power is obtained by calibrating according to the SOC of the power battery and the vehicle type; the value range of the first electric quantity state SOCa is 25% -35%; the control period is 5 to 10 times of the variable load period. The invention solves the problems of insufficient dynamic property, low economical efficiency and high temperature of the battery in the operation process of the fuel cell heavy truck in the prior art.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a power system of a fuel cell heavy truck, an energy management method and an energy management device.
Background
The fuel cell automobile has the advantages of long driving range, zero emission, high mass ratio power, wide hydrogen source and the like, and is an important development direction of new energy automobiles.
As the world carbon emission is large, china is faced with huge energy structure transformation pressure, and the demands for reducing the dependence on fossil energy and reducing carbon emission are increasingly urgent. 22, 9, 2020, xi jinping, general notes announced at the congress of united nationality: "China will increase the autonomous contribution of China, take more powerful policies and measures, the carbon dioxide emission strives to reach a peak before 2030 and strive to achieve carbon neutralization before 2060. The hydrogen energy is used as a clean, renewable and storable secondary energy, the application and development of the hydrogen energy are important actions for coping with climate change and environmental pollution, realizing carbon neutralization and guaranteeing sustainable development of energy, and the development of fuel cell automobiles becomes a strategic action for accelerating energy conservation, emission reduction and industry transformation in the traffic industry of all countries of the world.
The fuel cell heavy truck has the advantages of long driving range, zero emission, high mass specific power, short hydrogenation time and the like, and is an important development direction of new energy heavy trucks. The fuel cell is subject to the current state of the art, and its response speed is slow and can't carry out the energy recuperation, and general fuel cell car can not only use fuel cell system as the power supply, and its power supply still includes energy storage device, and energy storage device can be power battery, also can be the super capacitor. The technology of the power battery is rapidly developed, and the fuel battery automobiles at home and abroad all adopt the main flow power system scheme of a fuel battery and a power battery at present. In recent two years, with the large-force propulsion of the demonstration city group of the national fuel cell automobile, the power level of the fuel cell heavy truck and the charging and discharging power of the power cell are difficult to meet the whole automobile demands at present due to large load, high automobile speed and complex working condition, and the scheme and the energy management strategy of the fuel cell heavy truck power system need to be researched, so that the power performance and the economical demands of the whole automobile are met while the service lives of the fuel cell and the power cell are ensured.
The Chinese patent document with the grant publication number of CN111572411B discloses a power system, an energy control method and an energy control device of a fuel cell vehicle, and the average power of a fuel cell in the current 10 minutes is predicted and obtained according to the required power of the whole vehicle and the charge state of an energy storage device in the past 10 minutes; then in the control period of 10 minutes, the VCU controls the fuel cell to work at the average power of the first 10 minutes, so that the output power of the fuel cell is kept unchanged, and further, the dynamic balance of the SOC of the power cell is ensured. If the required power of the fuel cell heavy truck for the first 10 minutes is smaller, under the condition that the current required power of the whole truck is larger, the power cell and the output power of the fuel cell are difficult to meet the power requirement of the whole truck, and the power cell has the power shortage risk and influences the running of the whole truck.
The invention discloses a system and a method for controlling the running power of a vehicle fuel cell, which are based on the power following control system and the method of the fuel cell in an SOC (system on chip) section, and the fuel cell actively follows the power of a motor when the whole vehicle is in a driving state. Limited by the current fuel cell technology level, in the practical application process, the fuel cell system cannot quickly respond to meet the dynamic demand of the whole vehicle, and the rated power of the system cannot meet the peak power demand of the heavy goods vehicle, so that the power is insufficient.
In summary, the present fuel cell technology is limited by the current fuel cell technology development level, the fuel cell cannot realize frequent load change, the load change requirement of the whole vehicle is basically provided by the power cell, the energy management strategy of the domestic fuel cell heavy-duty fuel cell system is mainly based on the energy management of the power cell SOC state rule, which may cause frequent start-up and shutdown of the fuel cell, and cannot realize efficient operation.
In a word, at present, the heavy truck of the fuel cell is in the market leading-in stage, and the heavy truck of the fuel cell in China adopts a power system scheme of medium power and energy type power battery, so that the problems of high temperature, insufficient power and the like of the battery are easy to occur in the operation process.
Disclosure of Invention
The invention aims to provide a power system, an energy management method and an energy management device for a fuel cell heavy truck, which are used for solving the problems of insufficient power and high temperature of a battery in the operation process of the fuel cell heavy truck in the prior art.
In order to solve the technical problems, the technical scheme and the corresponding beneficial effects of the technical scheme provided by the invention are as follows:
the invention relates to an energy management method of a fuel cell heavy truck, which comprises the following steps:
1) Under the driving state, acquiring a power battery SOC state, power battery charging limiting power and fuel battery rated power;
2) If the SOC of the power battery is smaller than the SOCa in the first electric quantity state, determining the output power of the fuel battery in the current load-changing period according to the magnitude relation among the set power, the power battery charging limit power and the rated power of the fuel battery; setting the power as the sum of the average power of the whole vehicle and the compensation power in the last control period; the compensation power is obtained by calibrating according to the SOC of the power battery and the vehicle type; the value range of the first electric quantity state SOCa is 25% -35%; the control period length is 5 to 10 times the variable load period length.
The beneficial effects of the technical scheme are as follows: in the invention, in the low SOC power section, the output power of the fuel cell in the current variable load period is determined according to the magnitude relation among the average power of the whole vehicle, the compensation power, the charging limit power of the power cell and the rated power of the fuel cell in the previous control period, and the compensation power is set for the average power of the whole vehicle, so that the output power of the fuel cell determined by the three powers is large enough to provide enough power. Therefore, the invention solves the problem of insufficient dynamic property of the fuel cell heavy truck in the operation process. On the other hand, the power battery is a power type power battery, so that the problem of high temperature of the battery can be effectively avoided.
Further, in order to increase the power, the fuel cell output power in step 2) is set to a minimum value among the set power, the power cell charging limit power, and the fuel cell rated power.
Further, in order to avoid overload operation of the fuel cell and improve the economy of the whole vehicle, if the SOC of the power cell is greater than or equal to the first state of charge SOCa and less than the second state of charge SOCb in the driving state, setting the output power of the fuel cell in the current load-changing period to be the minimum value of the average power of the whole vehicle, the rated power of the fuel cell and the charging limit power of the power cell in the previous control period; the second state of charge SOCb has a value in the range of 40% -60%.
Further, in order to avoid the power battery working in a high-power section and improve economy, if the SOC of the power battery is greater than or equal to the second state of charge SOCb and less than the third state of charge SOCc in a driving state, setting the output power of the fuel battery in the current load-changing period to be the minimum value of the average power of the whole vehicle, the rated power of the fuel battery in a set percentage and the charging limit power of the power battery in the previous control period; setting the value range of the percentage to be 60% -80%; the value range of the third electric quantity state SOCc is 60% -80%.
Further, in the driving state, if the SOC of the power battery is greater than or equal to the third state of charge SOCc and less than the fourth state of charge SOCd, setting the output power of the fuel battery in the current load-changing period to be the minimum output power of the fuel battery; the value range of the fourth electric quantity state SOCd is 80% -90%.
Further, the working efficiency of the fuel cell system is improved, the economy of the whole vehicle is improved, N power points are set, the power cell SOC range is divided into N sections, and the power points corresponding to the sections in the ascending and descending processes of the power cell SOC are determined; under the stopping state, setting the output power of the fuel cell as a power point of a section corresponding to the current power cell SOC state in the current process; n is more than or equal to 4; wherein the value of the power point is determined according to the vehicle model.
Further, in order to improve the brake feedback duty ratio, improve the economy of the whole vehicle and improve the brake effect, in a brake state, if the sum of the current fuel cell output power and the driving motor feedback power is greater than the power cell charging limit power, the target power of the fuel cell is reduced according to a set speed value; the value range of the set speed value is [30kW/s,50kW/s ].
Further, the value range of the control period is [25min,35min ]; the value range of the variable load period is 4min and 6 min.
In order to solve the above problems, the present invention further provides an energy management device for a fuel cell heavy-duty card, which includes a processor for executing computer instructions to implement an energy management method for a fuel cell heavy-duty card as in the present invention.
In order to solve the above problems, the present invention further provides a power system of a fuel cell heavy card, which includes a fuel cell and a power type power cell, and further includes a memory and a processor for executing instructions stored in the memory to implement an energy management method of the fuel cell heavy card according to the present invention.
The beneficial effects of the technical scheme are as follows: the power battery can effectively avoid the problem of high temperature of the battery by adopting the power battery. In the invention, when the SOC of the power battery is too small, the output power of the fuel battery in the current variable load period is determined according to the magnitude relation among the average power of the whole vehicle, the compensation power, the charging limit power of the power battery and the rated power of the fuel battery in the last control period. Therefore, the invention solves the problem of insufficient dynamic property of the fuel cell heavy truck in the operation process.
Drawings
FIG. 1 is a schematic diagram of a power system architecture for a fuel cell heavy truck of the present invention;
FIG. 2 is a flow chart of a method of energy management of a fuel cell heavy truck of the present invention;
FIG. 3 is a flow chart of a fixed point mode of operation in an embodiment of the power system of the present invention;
FIG. 4 is a diagram of a power half-following mode in an embodiment of the powertrain of the present invention;
FIG. 5 is a diagram of a high SOC economy mode in an embodiment of the power system of the invention;
FIG. 6 is a low SOC fast power up mode diagram in an embodiment of the power system of the invention;
fig. 7 is a block diagram showing the construction of an energy management device for a heavy truck for a fuel cell according to the present invention.
Detailed Description
Key term interpretation:
a fuel cell power system: the device is composed of a fuel cell system, a fuel cell DC/DC, a hydrogen system, a power cell, a driving motor, a gearbox and other devices which are connected through electric, mechanical and low-voltage lines, and is provided with a system for providing power for the whole vehicle;
fuel cell idle power: refers to the minimum output power of the fuel cell system;
fast load shedding of the fuel cell: a process of rapidly dropping the fuel cell system from rated power or other operating point (in addition to idle power) to idle power;
fuel cell power half following: the output power of the fuel cell system is the average power of a period of time before the whole vehicle;
the fuel cell works at fixed point: refers to a power point where the fuel cell system output power is a set value.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Power system embodiment:
the invention discloses a power system embodiment of a fuel cell heavy truck, which aims at the current development situation of combining a heavy truck with the existing fuel cell system, designs a power system scheme of a medium power fuel cell system and a power type power cell, and provides a multi-mode self-adaptive energy management strategy based on automatic identification of different vehicle types and working conditions.
As shown in fig. 1, the power system of the fuel cell heavy truck comprises a fuel cell, a DCDC special for the fuel cell, a power cell, a hydrogen system, a driving motor, a five-in-one, a gearbox, a whole vehicle controller VCU and various component controllers. The fuel cell and the DCDC special for the fuel cell are fixedly connected into a whole, and are output to the motor controller in parallel with the power battery BMS through a high-voltage wire harness, and the whole vehicle is driven to run through the motor. The power system also comprises a whole vehicle controller and a memory, judges the state of the whole vehicle and the state of SOC, calculates and stores the power demand of the whole vehicle under the history working condition, controls the power output of the fuel cell and the output torque of the driving motor, realizes the adaptation of the output power of the fuel cell and the history working condition, and achieves the purposes of improving the working efficiency of the fuel cell and widening the applicable scene of the whole vehicle. The fuel cell rated power meets the average power requirement of the whole vehicle, the DCDC output end special for the fuel cell comprises a current sensor, the peak power of the power cell is close to the peak power of the driving motor, and meanwhile, the fuel cell, the hydrogen system, the power cell and the driving motor are controlled by the whole vehicle controller.
In order to achieve the aims of optimal working efficiency, good adaptability to working condition scenes and the like of a fuel cell system, the power system of the fuel cell adopts a fuel cell energy management strategy based on multi-rule constraints such as power cell SOC, whole vehicle start-stop, working condition demands and the like, and the fuel cell energy management strategy is also called multi-mode fuel cell energy management. The fuel cell heavy-duty truck controls the output power of the fuel cell by adopting the energy management method of the fuel cell heavy-duty truck, and the energy management method of the fuel cell heavy-duty truck is a strategy of multi-mode energy management of the fuel cell.
The following describes an energy management method of a fuel cell heavy truck, as shown in fig. 2, which adapts to different working scenarios and improves the working efficiency of a fuel cell system.
In a driving state, dividing an SOC section of the power battery into a shutdown SOC section, a high SOC section, a balance SOC section and a low SOC section, wherein different SOC sections adopt different energy management strategies, such as the power battery SOC is in the shutdown SOC section, and the fuel battery is in a shutdown state; in the high SOC interval, the fuel cell system works at idle speed; in the balanced SOC interval, the fuel cell system is in a half-following mode; in the low SOC interval, the fuel cell is in the rapid recharge mode.
In the off state, the fuel cell is operated at the corresponding operating point according to the different SOCs.
And in a braking state, judging the output power of the fuel cell, the feedback power of the driving motor and the charging power of the power cell, and if the sum of the power of the output power and the feedback power of the driving motor is larger than the charging power of the power cell, rapidly reducing the load of the fuel cell to the idle power. The following describes the energy management method of the fuel cell heavy truck according to each mode in detail:
when the whole vehicle is in a service braking state, judging the output power Pfc of the current fuel cell, the feedback power Plot_back of the driving motor and the charging limit power Pbat_limt of the power cell, and if Pfc+Plot_back > Pbat_limt, entering a quick load-reducing mode by the fuel cell.
When the whole vehicle is in normal running, automatically judging that the SOC state enters a corresponding mode according to the state of the SOC, and when the SOC is smaller than the SOCa, entering a low-SOC quick power-up mode, wherein the value range of the SOCa (first electric quantity state) is 25% -35%; when SOCa is less than or equal to SOC < SOCb, the half following mode is entered, and the value range of SOCb (second electric quantity state) is 40% -60%; when SOCb is less than or equal to SOC < SOCc, entering a high SOC economic mode, wherein the value range of SOCc (third electric quantity state) is 60% -80%; when SOCc is less than or equal to SOC < SOCd, the engine enters an idle mode, and the value range of SOCd (fourth electric quantity state) is 80% -90%. The idle mode is the minimum power that the fuel cell can output.
When the whole vehicle is in a parking state, the fuel cell system enters a fixed-point working mode.
As shown in fig. 2, the energy management method of the heavy truck for the fuel cell of the invention comprises the following steps:
s1, judging whether a brake pedal is stepped down; if the brake pedal is depressed, judging whether Pfc+Plot_back > Pbat_limt is true or not; if Pfc+Plot_back > Pbat_limt, then the fuel cell is in a rapid load-reducing mode; if Pfc+Plot_back is less than or equal to Pbat_limt, the original mode is maintained.
S2, if the brake pedal is not stepped, continuously judging whether to stop the vehicle or not; if the vehicle is stopped, the vehicle enters a fixed-point working mode.
S3, if the vehicle is not stopped, continuously judging whether the SOC is smaller than SOCa or not; if SOC is less than SOCa, the low SOC rapid power-up mode is entered.
S4, if the SOC is more than or equal to SOCa, continuously judging whether the SOC is less than SOCb or not; if SOC < SOCb, then enter half following mode.
S5, if the SOC is more than or equal to SOCb, continuously judging whether the SOC is less than SOCc or not; if SOC < SOCc, then enter high SOC economy mode.
S6, if the SOC is more than or equal to SOCc, continuously judging whether the SOC is less than SOCd or not; if the SOC is less than SOCd, entering an idle mode.
S7, if the SOC is more than or equal to SOCd, shutting down.
The following describes each mode:
1. a fast load shedding mode.
In this embodiment, the load-shedding rate of the fuel cell system is greater than 50kW/s, the rated power of the fuel cell is 120kW, the idle power is 10kW, and when this mode is triggered, the VCU requests the target power of the fuel cell to drop rapidly at a rate of 30kW/s to 100kW/s, the fuel cell system responds at the target power, and the output power of the fuel cell drops to the idle power within 1-2 s. In this embodiment, the target power of the fuel cell is rapidly reduced at a rate of 50kW/s, and in other embodiments, the target power of the fuel cell may be reduced at any value from 30kW/s to 100 kW/s.
2. Fixed point mode of operation.
In this embodiment, as shown in fig. 3, 4 operating points (power points) are set for the target power pfc_target of the fuel cell, and the values of the operating points Pfc0, pfc1, pfc2, pfc3, etc. are different depending on the operating conditions of the stirring, the slag and the traction vehicle, and Pfc0 has a power section of 10-20 kW; the value of Pfc1 is 20-60kW power interval; the value of Pfc2 is 60-80kW power interval; the value of Pfc3 is 80-120kW power interval; and calibrating the Pfc working point and the SOC judgment point according to the characteristics of the vehicle type and the working condition. For the working points, for example, pfc0, pfc1, pfc2 and Pfc3 corresponding to the mixer truck are respectively 10KW, 30KW, 50KW and 80KW in order. The corresponding Pfc0, pfc1, pfc2 and Pfc3 of the muck truck are respectively 16kW, 50kW, 60kW and 100kW in sequence. The corresponding Pfc0, pfc1, pfc2 and Pfc3 of the tractor are respectively 16kW, 60kW, 80kW and 120kW in sequence. As for the determination points, the present embodiment sets a plurality of determination points for the SOC falling process and the SOC rising process, respectively, four points SOCc, SOC0, SOC1, SOC2 of the rising process, and four points soc2+δ, soc1+δ, soc0+δ, SOCd of the falling process. The decision points such as SOC0, SOC1, SOC2 are also different according to the vehicle types, in order to increase stability, delta increment is set corresponding to the decision point in the ascending process in order to be different from the decision point in the descending process, and in general, the SOC0 takes 50% -60%; SOC1 takes 35% -50%; SOC2 takes on 25% -35%; delta is 5% -10%. The SOC falling process and the SOC rising process are determined according to the SOC state change recorded in the set period.
As shown in fig. 3, the flow of the process in the fixed point operation mode is as follows.
SOC drop process:
s1) if SOC is less than or equal to SOCc, pfc_target=pfc0;
s2) if SOC is less than or equal to SOC0, pfc_target=pfc1;
s3) if SOC is less than or equal to SOC1, pfc_target=pfc2;
s4) if SOC is less than or equal to SOC2, pfc_target=pfc3;
SOC rising process:
s5) if SOC is not less than SOC2+δ, pfc_target=pfc2;
s6) if SOC is not less than SOC1+δ, pfc_target=pfc1;
s7) if SOC is not less than SOC0+δ, pfc_target=pfc0;
s8) if the SOC is more than or equal to SOCd, stopping.
3. Half-following mode.
In this embodiment, in view of the fact that the average required power requirement of the fuel cell heavy truck in a short time is relatively high, the power rating of the fuel cell system may be exceeded, in order to avoid overload operation of the fuel cell and improve the overall economy of the vehicle, the fuel cell semi-following energy management adopts a mode that a calculation period is not synchronous with a load-changing period, specifically, a calculation period of an average power of a historical working condition (also referred to as an overall vehicle average power or simply as an average power in a previous control period) is set to 30min (the calculation period is also referred to as a control period), the load-changing period is set to 5min, and as shown in fig. 4, the average power of the first 30min, the rated power of the fuel cell and the power-charging limit power of the power cell are judged, and the output power of the fuel cell in the current load-changing period is the minimum of the three. The control period length is 5 to 10 times the variable load period length. In this embodiment, the control period is 30min, the variable load period is 5min, and in other embodiments, the control period may be any one of [25min,35min ], and the variable load period may be any one of [4min,6min ].
As shown in fig. 4, the processing flow in the half-follow mode includes the following:
calculating the average power of the whole vehicle in the previous period, and if the average power is less than or equal to the rated power of the FC, operating the output power of the fuel cell in the variable load period according to the average power; if the average power is larger than the power limit power of the power battery, the output power of the fuel battery in the variable load period operates according to the power limit power of the power battery; if the average power is less than the limit power of the power battery, the output power of the fuel battery in the variable load period operates according to the average power; if the average power is greater than the rated power of FC, the output power of the fuel cell in the variable load period operates according to the rated power. The FC rated power is the rated power of the fuel cell system, and FC is an abbreviation of fuel cell.
4. High SOC economy mode.
In this embodiment, as shown in fig. 5, on the basis of the half-following scheme, the output power of the fuel cell is optimized according to the state of the SOC, so that the power cell is prevented from operating in a high power section, and if the average power is greater than 80% of the rated power of the FC, the output power of the fuel cell is 80% of the rated power of the FC.
As shown in fig. 5, the processing flow in the high SOC economy mode includes the following:
calculating the average power of the whole vehicle in the previous period, and if the average power is less than or equal to the rated power of the FC, operating according to the average power; if the average power is larger than the power limit power of the power battery, the output power of the fuel battery in the variable load period operates according to the power limit power of the power battery; if the average power is less than the limit power of the power battery, the output power of the fuel battery in the variable load period operates according to the average power; if the average power is greater than 80% of rated power, the output power of the fuel cell in the variable load period operates according to 80% of rated power. In this embodiment, 80% of the rated power is taken (the set percentage), and in other embodiments, the set percentage may be any value from 60% to 80%.
5. Low SOC fast power up mode.
In this embodiment, as shown in fig. 6, on the basis of the half-following scheme, the compensation power is increased, and the fuel cell output power takes small values between the average power of the history condition + the compensation power, the power cell charging limit power, and the rated power of the fuel cell. And calibrating the compensation power through the SOC of the power battery and the vehicle type.
Specifically, as shown in fig. 6, the processing flow in the low SOC rapid power-up mode includes the following:
calculating the average power of the whole vehicle in the previous period, and if the average power is less than or equal to the rated power of the FC, operating according to the average power and the compensation power; if the average power and the compensation power are greater than the limit power of the power battery, the power battery is used for limiting the power; if the average power and the compensation power are less than the limit power of the power battery, the power battery is operated according to the average power and the compensation power; if the average power and the compensation power are greater than the rated power of the FC, the method operates according to the rated power.
Firstly, the invention designs a power system of a medium power fuel cell system and a power type power cell, which meets the average power and power performance requirements of a heavy truck, solves the problem of high temperature of the power cell, improves the power performance of the whole truck, widens the application scene of the fuel cell heavy truck, improves the brake feedback duty ratio, and improves the economy of the whole truck. Then, according to the fixed-point working mode, different SOC balance points are set according to the working condition characteristics of different vehicle types, so that the working efficiency of the fuel cell is improved, and the economy of the whole vehicle is improved. And then, through the integral multi-mode fuel cell energy management strategy, the scene adaptability of the fuel cell heavy truck is widened, and the power performance and the economy of the whole truck are improved. Finally, through the rapid load reduction mode, the electric braking effect can be improved, the electric braking feedback duty ratio can be improved, and the hydrogen consumption of the whole vehicle can be reduced.
Method embodiment:
an embodiment of an energy management method for a heavy truck of a fuel cell according to the present invention, as shown in fig. 2, includes the following steps:
1) Under the driving state, acquiring a power battery SOC state, power battery charging limiting power and fuel battery rated power;
2) If the SOC of the power battery is smaller than the SOCa in the first electric quantity state, determining the output power of the fuel battery in the current load-changing period according to the magnitude relation among the set power, the power battery charging limit power and the rated power of the fuel battery; setting the power as the sum of the average power of the whole vehicle and the compensation power in the last control period; the compensation power is obtained by calibrating according to the SOC of the power battery and the vehicle type; the value range of the first electric quantity state SOCa is 25% -35%; the control period length is 5 to 10 times the variable load period length. The method can be applied to a power system of a fuel cell heavy truck in the power system embodiment, and the content of the method is the same as the energy management method of the fuel cell heavy truck in the power system embodiment, and is not repeated here.
Device example:
an embodiment of an energy management device for a fuel cell heavy card of the invention is shown in fig. 7, and the energy management device comprises a memory, a processor and an internal bus, wherein the processor and the memory are communicated with each other and data interaction is completed through a CAN bus. The memory and processor may be that of a vehicle control unit VCU, as described in connection with the exemplary embodiment of the powertrain system. The processor may also be other processing devices in the whole vehicle, such as a microprocessor MCU, a programmable logic device FPGA, etc. The memory may also be other storage devices in the whole vehicle, such as a high-speed random access memory, or may be a non-volatile memory, such as one or more magnetic storage devices, flash memory, etc. The memory includes at least one software functional module stored in the memory, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory to implement an energy management method for a fuel cell heavy-duty card in accordance with embodiments of the power system of the present invention. The method achieves the same effects as an energy management method of a fuel cell heavy truck in the power system embodiment, and is described in detail in the power system embodiment, so that the detailed description is omitted herein.
Claims (10)
1. An energy management method for a fuel cell heavy truck, which is characterized by comprising the following steps: the method comprises the following steps:
1) Under the driving state, acquiring a power battery SOC state, power battery charging limiting power and fuel battery rated power;
2) If the SOC of the power battery is smaller than the SOCa in the first electric quantity state, determining the output power of the fuel battery in the current load-changing period according to the magnitude relation among the set power, the power battery charging limit power and the rated power of the fuel battery; setting the power as the sum of the average power of the whole vehicle and the compensation power in the last control period; the compensation power is obtained by calibrating according to the SOC of the power battery and the vehicle type; the value range of the first electric quantity state SOCa is 25% -35%; the control period length is 5 to 10 times the variable load period length.
2. The energy management method of a fuel cell heavy truck of claim 1, wherein: the fuel cell output power in step 2) is set to a minimum value among the set power, the power cell charging limit power and the fuel cell rated power.
3. The energy management method of a fuel cell heavy truck of claim 1, wherein: in a driving state, if the SOC of the power battery is larger than or equal to the SOCa in the first electric quantity state and smaller than the SOCb in the second electric quantity state, setting the output power of the fuel battery in the current load changing period as the minimum value of the average power of the whole vehicle, the rated power of the fuel battery and the charging limit power of the power battery in the previous control period; the second state of charge SOCb has a value in the range of 40% -60%.
4. The energy management method of a fuel cell heavy truck of claim 1, wherein: in the driving state, if the SOC of the power battery is larger than or equal to the SOCb of the second electric quantity state and smaller than the SOCc of the third electric quantity state, setting the output power of the fuel battery in the current load changing period to be the minimum value of the average power of the whole vehicle in the previous control period, the rated power of the fuel battery with a set percentage and the charging limit power of the power battery; setting the value range of the percentage to be 60% -80%; the value range of the third electric quantity state SOCc is 60% -80%.
5. The energy management method of a fuel cell heavy truck of claim 1, wherein: in a driving state, if the SOC of the power battery is larger than or equal to the SOCc of the third electric quantity state and smaller than the SOCd of the fourth electric quantity state, setting the output power of the fuel battery in the current load-changing period as the minimum output power of the fuel battery; the value range of the fourth electric quantity state SOCd is 80% -90%.
6. The energy management method of a fuel cell heavy truck of claim 1, wherein: setting N power points, dividing the SOC range of the power battery into N sections, and determining the power points corresponding to each section in the ascending and descending processes of the SOC of the power battery; under the stopping state, setting the output power of the fuel cell as a power point of a section corresponding to the current power cell SOC state in the current process; n is more than or equal to 4; wherein the value of the power point is determined according to the vehicle model.
7. The energy management method of a fuel cell heavy truck of claim 1, wherein: in a braking state, if the sum of the current fuel cell output power and the feedback power of the driving motor is larger than the power cell charging limit power, the target power of the fuel cell is reduced according to a set speed value; the value range of the set speed value is [30kW/s,100kW/s ].
8. The energy management method of a fuel cell heavy truck according to any one of claims 1 to 7, characterized in that: the value range of the control period is [25min,35min ]; the value range of the variable load period is 4min and 6 min.
9. An energy management device for a fuel cell heavy truck, characterized by: the apparatus comprising a processor for executing computer instructions to implement the energy management method of a fuel cell heavy truck as defined in any one of claims 1 to 8.
10. The utility model provides a power system of fuel cell heavy card, includes fuel cell and power type power cell, its characterized in that: further comprising a memory and a processor for executing instructions stored in the memory to implement the energy management method of a fuel cell heavy truck as defined in any one of claims 1 to 8.
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