CN111186301B - Integrated control device for fuel cell vehicle and overcurrent protection control method - Google Patents
Integrated control device for fuel cell vehicle and overcurrent protection control method Download PDFInfo
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- CN111186301B CN111186301B CN202010040495.6A CN202010040495A CN111186301B CN 111186301 B CN111186301 B CN 111186301B CN 202010040495 A CN202010040495 A CN 202010040495A CN 111186301 B CN111186301 B CN 111186301B
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
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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
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/32—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for controlling the temperature of fuel cells, e.g. by controlling the electric load
- B60L58/33—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for controlling the temperature of fuel cells, e.g. by controlling the electric load by cooling
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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
- 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
- B60L2240/545—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application belongs to the technical field of integrated control devices for vehicles, and particularly relates to an integrated control device for a fuel cell vehicle and an overcurrent protection control method. The control device comprises a control main board, a first loop and a second loop, wherein the first loop and the second loop are connected with the control main board, the first loop is used for controlling air conditioning output and DC/DC power distribution output on the whole vehicle, and the second loop is used for controlling power distribution output of other high-voltage devices on the whole vehicle. The application is used for solving the problems of low integration level, potential safety hazard and energy waste of the traditional four-in-one integrated control device. Through the first return circuit and the second return circuit of being connected with the control mainboard, satisfy the distribution demand of fuel cell passenger train running state and charge state, highly integrate, reduce cost, high-efficient power saving and safety simultaneously, through oil pump temperature acquisition module and the air pump current acquisition module who is connected with the CPU for the device is whole to have oil pump motor overheat protection, air pump motor overcurrent protection, reliable saving worry.
Description
Technical Field
The application belongs to the technical field of integrated control devices for vehicles, and particularly relates to an integrated control device for a fuel cell vehicle and an overcurrent protection control method.
Background
Hydrogen fuel automobiles (FCV) are in the period of accelerating development, more and more hydrogen fuel automobiles are put into use, but the current four-in-one integrated controller of the electric motor coach cannot meet the high-voltage power distribution and supply requirements of the fuel cell coach, and the monitoring and protecting functions are not comprehensive. At present, the fuel cell passenger car is mostly based on a four-in-one integrated controller of the electric motor coach, PDU, DC/DC and high-voltage connecting wires are additionally added, potential safety hazards exist, reliability is low, and cost is high. The performance of the power battery is sensitive to temperature change, and in order to avoid short circuit and thermal runaway caused by lithium precipitation during low-temperature charging, the power battery is cooled by water cooling; however, due to the limitation of arrangement space and cost, a vehicle-mounted air conditioner is integrated into a water cooling type for cooling a power battery, but the defect is that the power battery needs to be charged in four ways for the vehicle-mounted air conditioner and DC/DC power distribution, the former four ways of internal high-voltage power distribution adopt a single loop, so that the vehicle-mounted air conditioner and the DC/DC power distribution can be simultaneously distributed for other high-voltage electric appliances on the whole vehicle, if a switch is forgotten to be turned off or the misoperation is caused, the other high-voltage electric appliances can be caused to work, potential safety hazards and energy waste exist, in addition, the traditional four ways of overcurrent protection strategies are usually respectively timed by two timers, and loopholes and risks exist.
Disclosure of Invention
The application aims to solve the technical problems of overcoming the defects of the prior art, and providing an integrated control device for a fuel cell vehicle and an overcurrent protection control method, which are used for solving the problems of low integration level, potential safety hazard and energy waste of the traditional four-in-one integrated control device.
The technical scheme for solving the technical problems is as follows: the integrated control device for the fuel cell vehicle comprises a control main board, and a first loop and a second loop which are both connected with the control main board, wherein the first loop is used for controlling air conditioning output and DC/DC power distribution output on the whole vehicle, and the second loop is used for controlling power distribution output of other high-voltage devices on the whole vehicle.
Compared with the prior art, the technical scheme has the following beneficial effects:
through the double loop of being connected with the control mainboard, realize when charging through the power battery who connects the controlling means that this technical scheme provided, only for on-vehicle air conditioner and DC/DC distribution output, do not avoid other equipment to electrified accident and avoiding the energy extravagant that causes because of the maloperation for other high-voltage equipment distribution.
Further, the first loop comprises a first DC/DC converter, a second DC/DC converter and an air conditioner interface, wherein the first DC/DC converter and the second DC/DC converter are connected with the control main board, the first DC/DC converter is used for being connected with a low-voltage distribution system of the whole vehicle, and the second DC/DC converter is used for being connected with a fuel cell cooling system of the whole vehicle.
According to the technical scheme, compared with one-way DC/DC conversion output of the traditional four-in-one control device, the two-way DC/DC converter is provided, so that the problem that the DC/DC converter needs to be added outside is avoided, and the integration degree is improved; meanwhile, an air conditioner interface is added in the loop to be connected with a vehicle-mounted air conditioner, and when the power battery is charged, the whole vehicle integrated water-cooled air conditioning system is operated to cool the power battery, so that the charging temperature of the power battery is kept constant.
Further, the second loop comprises an oil pump controller, an air pump controller, a fuel cell interface, a motor control interface, an air pump cooling interface, an electric warm air interface and an electric defrosting interface, and the oil pump controller and the air pump controller are connected with the control main board.
According to the technical scheme, the connection with external equipment is realized by adding various external interfaces, the power distribution requirement of the whole fuel cell bus is met, and simultaneously, the actions of the oil pump controller and the air pump controller are controlled through the control main board.
Further, the control main board comprises a CPU, and a voltage acquisition module, a high-voltage power distribution control module, an oil pump temperature acquisition module and an air pump current acquisition module which are all connected with the CPU.
According to the technical scheme, the oil pump temperature and the air pump current are collected through the oil pump temperature collection module and the air pump current collection module, so that effective monitoring of the oil pump and the air pump is realized, and the fault condition is timely alarmed and controlled.
Further, the control main board further comprises an adhesion detection module connected to the CPU, and the adhesion detection module is used for detecting the level state of the auxiliary contact of the high-voltage power distribution control module to judge whether the on-off is in place or not.
According to the technical scheme, whether the high-voltage distribution control module is in place or not is judged by detecting the level state of the auxiliary contact in the high-voltage distribution control module through the adhesion detection module connected with the CPU.
Further, the voltage acquisition module comprises a first voltage acquisition module, a second voltage acquisition module, a third voltage acquisition module and a fourth voltage acquisition module, wherein the first voltage acquisition module acquires the voltage of the first loop, the second voltage acquisition module acquires the voltage of the second loop, the third voltage acquisition module acquires the voltage of the first DC/DC converter, and the fourth voltage acquisition module acquires the voltage of the second DC/DC converter.
According to the technical scheme, the input voltage values of the first loop, the second loop, the first DC/DC converter and the second DC/DC converter are detected through the four voltage acquisition modules respectively to be compared with the battery voltage, and whether under-voltage and over-under-voltage are judged.
Further, the CPU also includes a timer T1 and a timer T2.
The application further discloses an overcurrent protection control method for the fuel cell vehicle based on the integrated control device for the fuel cell vehicle, which comprises the following steps:
s1, presetting a first current threshold, a second current threshold, a first time threshold and a second time threshold, wherein the second current threshold is larger than the first current threshold;
s2, collecting a current value of an external load motor through the air pump current collection module, judging the magnitude relation between the current value and the first current threshold value and the magnitude relation between the current value and the second current threshold value by the CPU, and controlling the timer T1 and the timer T2 to take corresponding operations by the CPU;
s3, the CPU judges the relation between the current time T of the timer T1 and the current time T of the timer T2 and the first time threshold and the second time threshold respectively, and determines whether the CPU controls the load motor to stop.
Further, the step S2 specifically includes:
if the current value is smaller than or equal to the first current threshold value, the CPU controls the timer T1 to self-decrease and the timer T2 to self-decrease;
if the current value is greater than the first current threshold and less than or equal to the second current threshold, the CPU controls the timer T1 to self-count up and the timer T2 to self-count down;
if the current value is larger than the second current threshold value, the CPU controls the timer T1 and the timer T2 to count by self-addition;
wherein, the timer T1 and the timer T2 are self-reduced to 0.
Further, the step S3 specifically includes:
and the CPU judges whether the current time T1 of the timer T1 is larger than the first time threshold or whether the current time T2 of the timer T2 is larger than the second time threshold, and if yes, the CPU controls the load motor to stop.
The application has the beneficial effects that:
the first loop and the second loop connected with the control main board meet the power distribution requirements of the fuel cell passenger car in a driving state and a charging state, meanwhile, the first loop comprises the first DC/DC converter and the second DC/DC converter, PDU, DC/DC and high-voltage connecting wires are not required to be additionally added, the high integration is realized, the cost is reduced, the high-efficiency electricity saving is realized, the safety is realized, the contact state of the contactor is effectively mastered in real time through the adhesion detection module connected with the CPU, the later maintenance and the debugging are facilitated, and the oil pump temperature acquisition module and the air pump current acquisition module connected with the CPU are used for ensuring that the whole device has the overheat protection of an oil pump motor and the overcurrent protection of the air pump motor, so that the reliability is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an overall system interface according to embodiment 1 of the present application;
FIG. 2 is a schematic view of the internal module structure in FIG. 1;
fig. 3 is a flowchart of a control process according to embodiment 2 of the present application.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Example 1
As shown in fig. 1, the integrated control device for a fuel cell vehicle provided by the application is used for being connected to the output end of a power cell on the vehicle, plays a role in controlling the output of electric energy of the power cell in an auxiliary control mode, and transmits the electric energy to each needed electric interface on the whole vehicle.
Example 2
Based on embodiment 1, the first loop includes a first DC/DC converter, a second DC/DC converter, and an air conditioning interface, where the first DC/DC converter is a 3KW DC/DC converter, the second DC/DC converter is a 6KW DC/DC converter, the first DC/DC converter and the second DC/DC converter are connected to a control motherboard, the control motherboard is used to transmit control signals to the first DC/DC converter and the second DC/DC converter, the first DC/DC converter is used to connect a low-voltage distribution system of the whole vehicle, the low-voltage distribution system is a storage battery and a low-voltage device on the whole vehicle connected to the storage battery, the second DC/DC converter is used to connect a fuel cell cooling system, and by setting two paths of DC/DC converters, compared with the previous four-in-one control device, the two paths of DC/DC converters are provided, the problem that the DC/DC converters need to be added outside is avoided, and the integration degree is improved; meanwhile, an air conditioner interface is added to the loop to connect a vehicle-mounted air conditioner, when the power battery is charged, the control main board is used for controlling the operation of the vehicle-mounted air conditioner connected with the air conditioner interface to work, the cooling temperature control is carried out on the power battery, the charging temperature of the power battery is kept constant, the power supply of other high-voltage equipment is not distributed, the cooling requirement of the power battery during charging is met, the power supply of other high-voltage appliances is ensured not to be distributed, the safety accidents caused by misoperation or forgetting to turn off a switch are avoided, the safety of the whole vehicle is improved, the energy waste is avoided, meanwhile, as two paths of DC/DC converters are integrated, no extra increase is needed, the integration degree is improved, and the cost is reduced.
In this embodiment, the second return circuit includes oil pump controller, air pump controller, fuel cell interface, motor control interface, air pump cooling interface, electric warm wind interface and electric defrosting interface, oil pump controller and air pump controller are connected with the control mainboard, oil pump controller and air pump controller receive the control signal realization control output from the control mainboard, realize being connected with external equipment through increasing multiple external interface, satisfy the distribution requirement of fuel cell passenger train whole car, need not additionally to increase PDU, and the second return circuit is independent with first return circuit, only first return circuit switch-on when charging, high-efficient power saving, safety.
As shown in fig. 2, the control main board comprises a CPU, and a voltage acquisition module, a high-voltage distribution control module, an oil pump temperature acquisition module and an air pump current acquisition module which are all connected with the CPU, wherein the CPU adopts a microprocessor with the model of TMS320F28034PNT, in addition, the air pump controller, the oil pump controller, the first DC/DC converter and the second DC/DC converter are also connected with the CPU in the control main board, the CPU is used for sending out instructions or realizing control actions of the first DC/DC converter, the second DC/DC converter, the oil pump controller and the air pump controller through CAN communication, in addition, the oil pump temperature acquisition module and the air pump current acquisition module acquire oil pump temperature and air pump current to realize effective monitoring of the oil pump and the air pump, wherein the oil pump temperature acquisition module CAN acquire and judge the resistance of the oil pump motor PT100 in real time through the CPU, when the temperature of the motor is over-temperature at the second stage, namely, the temperature of the oil pump motor reaches 120 ℃, the power is reduced, and the oil pump controller feeds back the second-stage faults; when the primary temperature of the motor exceeds the temperature, namely, the temperature of the oil pump motor reaches 140 ℃, stopping the motor, and feeding back a primary fault by an oil pump controller message to protect the external oil pump motor; in addition, the air pump current acquisition module can acquire an air pump current signal by adopting a Hall type current sensor, and the CPU acquires and judges the output current of the air pump controller in real time to protect the air pump motor; judging whether the fault condition occurs or not through temperature and current signals acquired by the oil pump temperature acquisition module and the air pump current acquisition module, alarming and controlling in time to prevent accidents, wherein the high-voltage distribution control module comprises contactors, fuses and the like connected to branches of each loop, and the contactors are controlled through a CPU (central processing unit), so that the on-off of each branch and each loop is controlled to complete high-voltage distribution, and the use of a high-voltage distribution cabinet on the whole car is reduced.
The control main board further comprises an adhesion detection module connected to the CPU and used for detecting whether the on-off of the high-voltage distribution control module is in place or not. The adhesion detection module judges whether the high-voltage distribution control module is in place or not through the level state of the auxiliary contact of the contactor in the high-voltage distribution control module, so that later maintenance and debugging are facilitated, and the adhesion detection module can adopt a circuit board composed of a singlechip with the model of lpc11c14 and a peripheral circuit, so that the circuit is simplified, and the internal arrangement space is reduced.
In this embodiment, the voltage acquisition module includes first voltage acquisition module, second voltage acquisition module, third voltage acquisition module and fourth voltage acquisition module, and above-mentioned voltage acquisition module all adopts the voltage acquisition module of model ACPL-C87B-000E, and the input voltage of first return circuit is gathered to first voltage acquisition module, and the input voltage of second return circuit is gathered to second voltage acquisition module, and the input voltage of first DC/DC converter is gathered to third voltage acquisition module, and the input voltage of second DC/DC converter is gathered to fourth voltage acquisition module. The input voltage values of the first loop, the second loop, the first DC/DC converter and the second DC/DC converter are respectively detected through the four voltage acquisition modules, compared with the battery voltage, whether under-voltage or under-voltage is judged, and the protection function is achieved.
Further, a current sensor is further arranged on the power battery main loop, the current sensor is connected to the CPU, and the current sensor is used for detecting a battery current signal. The maximum output current is detected through a current sensor arranged on the main loop of the power battery, and if the maximum output current is exceeded, an alarm signal is sent out through the CPU and the high-voltage power distribution of the whole loop is cut off through the high-voltage power distribution control module.
In this embodiment, the CPU further includes a timer T1 and a timer T2.
Example 3
Based on the control device in embodiment 2, the embodiment also discloses an overcurrent protection control method for a fuel cell vehicle, as shown in fig. 3, the flow chart is that the current of an external load motor is collected in real time through an air pump current collection module connected with a CPU, in the embodiment, the load motor is an air pump motor, the overcurrent protection control of the external air pump is realized, the air pump current collection module adopts a direct current shunt with a specific model of FL-2, the collection period is 40ms, and in one collection period, the following steps are specifically executed:
s1, presetting a first current threshold value to be 150% of rated current of an air pump motor, presetting a second current threshold value to be 200% of rated current of the air pump motor, presetting a first time threshold value to be 30S and presetting a second time threshold value to be 5S;
s2, acquiring a current value of an external air pump motor through an air pump current acquisition module, judging the magnitude relation between the current value and a first current threshold value and a second current threshold value by a CPU, and controlling a timer T1 and a timer T2 to take corresponding operations by the CPU;
s3, the CPU respectively judges the relation between the current time T of the timer T1 and the current time T of the timer T2 and the first time threshold value and the second time threshold value, and determines whether the CPU controls the load motor to stop.
And then entering the next acquisition period to execute the control step of a new round, and protecting the motor from the over-current damage to the air pump motor by circularly and reciprocally executing the control step according to the current value of the acquired air pump motor.
The step S2 specifically includes:
if the current value is less than or equal to 150% of the rated current, the CPU controls the timer T1 to self-decrease and controls the timer T2 to self-decrease;
if the current value is greater than 150% of the rated current and less than or equal to 200% of the rated current, the CPU controls the timer T1 to self-count up and simultaneously controls the timer T2 to self-count down;
if the current value is greater than 200% of the rated current, the CPU controls the timer T1 and the timer T2 to count by self;
wherein, the timer T1 and the timer T2 are reduced from the minimum to 0, and the initial values of the timer T1 and the timer T2 are 0.
In addition, the step S3 specifically includes:
the CPU judges whether the current time T1 of the timer T1 is larger than 30S or whether the current time T2 of the timer T2 is larger than 5S, and if yes, the CPU controls the load motor to stop.
Because the operation that the timer T1 and the timer T2 respectively count is executed under the condition that the current value meets the first current threshold value and the second current threshold value simultaneously, and the CPU respectively judges whether the current time T of the timer T1 and the timer T2 is larger than the preset time threshold value, the CPU controls the air pump motor to stop as long as one of the timers T1 and T2 meets the condition that the current time T is larger than the time threshold value; in addition, the timer is added to be automatically subtracted when the current threshold value is smaller than the current threshold value, the phenomenon that due protection effect cannot be generated when the current of the air pump motor fluctuates up and down around the first current threshold value and the second current threshold value is avoided, the timer can execute zero clearing operation when the current collecting value fluctuates up and down in the preset current threshold value according to the traditional control strategy, the timer is further caused to work repeatedly in the zero clearing-timing cycle process continuously, the motor is damaged due to the fact that the motor is higher and higher in long-time heavy current working temperature, and the protection effect cannot be achieved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (2)
1. An overcurrent protection control method of an integrated control device for a fuel cell vehicle is characterized by comprising the following steps of: the integrated control device includes: the control system comprises a control main board, a first loop and a second loop, wherein the first loop and the second loop are both connected with the control main board, the first loop is used for controlling air conditioning output and DC/DC power distribution output on the whole vehicle, and the second loop is used for controlling power distribution output of other high-voltage devices on the whole vehicle;
the first loop comprises a first DC/DC converter, a second DC/DC converter and an air conditioner interface, wherein the first DC/DC converter and the second DC/DC converter are connected with the control main board, the first DC/DC converter is used for being connected with a low-voltage distribution system of the whole vehicle, and the second DC/DC converter is used for being connected with a fuel cell cooling system of the whole vehicle;
the second loop comprises an oil pump controller, an air pump controller, a fuel cell interface, a motor control interface, an air pump cooling interface, an electric warm air interface and an electric defrosting interface, and the oil pump controller and the air pump controller are connected with the control main board;
the control main board comprises a CPU, and a voltage acquisition module, a high-voltage power distribution control module, an oil pump temperature acquisition module and an air pump current acquisition module which are all connected with the CPU;
the control main board also comprises an adhesion detection module connected to the CPU and used for detecting whether the on-off of the high-voltage distribution control module is in place or not;
the voltage acquisition module comprises a first voltage acquisition module, a second voltage acquisition module, a third voltage acquisition module and a fourth voltage acquisition module, wherein the first voltage acquisition module acquires the voltage of the first loop, the second voltage acquisition module acquires the voltage of the second loop, the third voltage acquisition module acquires the voltage of the first DC/DC converter, and the fourth voltage acquisition module acquires the voltage of the second DC/DC converter;
the CPU also comprises a timer T1 and a timer T2;
the overcurrent protection control method comprises the following steps:
s1, presetting a first current threshold, a second current threshold, a first time threshold and a second time threshold, wherein the second current threshold is larger than the first current threshold;
s2, collecting a current value of an external load motor through the air pump current collection module, judging the magnitude relation between the current value and the first current threshold value and the magnitude relation between the current value and the second current threshold value by the CPU, and controlling the timer T1 and the timer T2 to take corresponding operations by the CPU;
the method comprises the following steps: if the current value is smaller than or equal to the first current threshold value, the CPU controls the timer T1 to self-decrease and the timer T2 to self-decrease;
if the current value is greater than the first current threshold and less than or equal to the second current threshold, the CPU controls the timer T1 to self-count up and the timer T2 to self-count down;
if the current value is larger than the second current threshold value, the CPU controls the timer T1 and the timer T2 to count by self-addition;
wherein the timer T1 and the timer T2 self-decrease to 0;
s3, the CPU judges the relation between the current time T of the timer T1 and the current time T of the timer T2 and the first time threshold and the second time threshold respectively, and determines whether the CPU controls the load motor to stop.
2. The control method according to claim 1, characterized in that: the step S3 specifically comprises the following steps:
and the CPU judges whether the current time T1 of the timer T1 is larger than the first time threshold or whether the current time T2 of the timer T2 is larger than the second time threshold, and if yes, the CPU controls the load motor to stop.
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