CN107199891B - Fuel cell automobile power-on and power-off control method, whole automobile controller and electric automobile - Google Patents
Fuel cell automobile power-on and power-off control method, whole automobile controller and electric automobile Download PDFInfo
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- CN107199891B CN107199891B CN201710369605.1A CN201710369605A CN107199891B CN 107199891 B CN107199891 B CN 107199891B CN 201710369605 A CN201710369605 A CN 201710369605A CN 107199891 B CN107199891 B CN 107199891B
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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
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0053—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- Transportation (AREA)
- Automation & Control Theory (AREA)
- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a fuel cell automobile power-on and power-off control method, a vehicle controller and an automobile, wherein the fuel cell automobile power-on and power-off control method comprises the following steps: acquiring a power-on instruction or a power-off instruction; and controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction or controlling the power-off system of the fuel cell automobile to be powered off according to the power-off instruction. The invention establishes signal interaction logic methods between VCUs and BMSs, between VCUs and MCUs, between VCUs and APUs, between VCUs and air conditioning system controllers and between VCUs and DCDCDCDC, realizes the monitoring of the whole vehicle high-voltage state by the VCUs, improves the working efficiency of the APUs after the whole vehicle high-voltage system is electrified, eliminates the high-voltage discharge risk caused by the mismatching of the whole vehicle power-off time sequence and the APUs power-off time sequence, and improves the safety of the high-voltage system.
Description
Technical Field
The invention relates to the field of fuel cell automobiles, in particular to a fuel cell automobile power-on and power-off control method, a vehicle control unit and an electric automobile.
Background
The fuel cell automobile mainly takes hydrogen as fuel and takes electrochemical reaction of hydrogen and oxygen combined to generate electricity as a power source, and compared with the traditional automobile, the fuel cell automobile has no pollution in emission; compared with a pure electric vehicle, the fuel loading time is short, and the driving range is long. At present, the power-on and power-off control method for a fuel cell automobile is few, when the whole automobile is powered on, the temperature of a galvanic pile in an APU directly influences the conversion efficiency of the fuel cell, and the high-voltage discharge risk is probably caused by the mismatching of the power-off time sequence of the whole automobile and the power-off time sequence of the APU, so that the safety of a high-voltage system of the whole automobile is influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a fuel cell vehicle power-on and power-off control method, a vehicle control unit and an electric vehicle, and solves the problems of low fuel cell conversion efficiency and high-voltage discharge risk caused by the time sequence problem of vehicle power-off and APU power-off.
According to an aspect of the present invention, there is provided a power-on and power-off control method for a fuel cell vehicle, including:
acquiring a power-on instruction or a power-off instruction;
and controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction or controlling the power-off system of the fuel cell automobile to be powered off according to the power-off instruction.
Optionally, the step of obtaining a power-on instruction or a power-off instruction includes:
the VCU of the vehicle controller obtains a power-on instruction or a power-off instruction through a keyless starting system and a brake pedal signal of the fuel cell vehicle.
Optionally, the step of controlling the power-on system of the fuel cell vehicle to be powered on according to the power-on command comprises:
when the VCU judges that the whole vehicle mode of the fuel cell vehicle is in a driving mode according to the power-on instruction, the VCU wakes up a battery management system BMS, a driving motor controller MCU, a hydrogen system range extender APU, an air conditioning system controller and a direct current conversion controller DCDC;
and the VCU controls the BMS, the MCU, the APU, the air conditioning system controller and the DCDC to carry out low-voltage self-detection and control high-voltage system detection, and the electrification of the electrification system is completed.
Optionally, the step of the VCU controlling the BMS, the MCU, the APU, the air conditioning system controller, and the DCDC to perform low voltage self-test includes:
the VCU wakes up the BMS, the MCU, the APU, the air conditioning system controller and the DCDC, and the woken-up controller carries out in-board low voltage self-detection in a mode of reading an in-board memory EEPROM of the corresponding low voltage controller;
the VCU and the BMS, the MCU, the APU, the air conditioning system controller and the DCDC carry out communication message interaction through the CAN bus, judge whether the communication between the VCU and the BMS, the MCU, the APU, the air conditioning system controller and the DCDC has a signal frame loss condition or not, and judge whether a battery cathode relay is normally in a disconnected state or not.
Optionally, the step of the VCU controlling the BMS, the MCU, the APU, the air conditioning system controller, and the DCDC to perform low voltage self-test further includes:
if the low-voltage controller board is normal, the CAN bus communication is normal and the battery cathode relay is in a normal disconnection state, the VCU controls the power battery cathode relay to be closed;
and if the VCU judges that the current high-voltage system has serious faults, the high voltage on the system is forbidden, the BMS, the MCU, the APU, the air-conditioning system controller, the DCDC and the self controller are guided to sleep, and the whole high-voltage system is powered off.
Optionally, the step of the VCU controlling the detection of the high voltage system includes:
the VCU controls the high-voltage self-checking of the power battery, wherein when the BMS judges that the pre-charging relay and the positive relay of the power battery have closing faults, the VCU guides the negative relay of the power battery to be disconnected;
whether the pre-charging relay is adhered or not is detected, if the fault exists, the BMS controls the anode relay to be disconnected, the VCU controls the cathode relay to be disconnected, and the high-voltage system is powered off.
Optionally, the step of the VCU controlling the power battery high voltage self-test further includes:
if the power battery pre-charging relay and the positive pole relay have no closing fault, the BMS controls the pre-charging relay of the power battery to be closed, the positive pole relay is controlled to be closed after a first preset time length, and the pre-charging relay is controlled to be opened after the next first preset time length.
Optionally, the step of the power-on and power-off control method of the fuel cell vehicle further comprises
When the power-on state of the power-on system is up, when the VCU judges that the need of starting the APU of the hydrogen system range extender exists, acquiring the temperature of a galvanic pile in the APU;
when the temperature of the cell stack is lower than a first preset value, the VCU sends a cell stack heating signal to the APU, the APU system enters a heating mode, when the temperature of the cell stack is higher than a second preset value, the APU judges that the cell stack can work at high efficiency under the temperature, the APU sends an enabling state signal to the VCU, the VCU sends a working enabling signal to the APU, and at the moment, the power battery and the cell stack output power simultaneously.
Optionally, the step of controlling the power-off system of the fuel cell automobile to power off according to the power-off instruction comprises:
and the VCU guides the high-voltage system to be powered off, prohibits the direct-current conversion controller DCDC and the air-conditioning system controller from being enabled according to the power-off instruction, controls the MCU to enter a zero-torque mode, controls the BMS to control the positive relay of the battery to be disconnected, controls the VCU to actively discharge the high-voltage system and control the negative relay of the battery to be disconnected, performs power failure detection on the high-voltage system, and guides the BMS, the MCU, the APU, the air-conditioning system controller, DCDC dormancy and VCU self dormancy to finish power-off of the high-voltage system.
Optionally, the step of the VCU guiding the high-voltage system to be powered down according to the power-down instruction includes:
and the VCU sends an APU enable shutdown signal to the APU, the VCU enters a waiting mode, the APU sends a cooling instruction to the cooling water pump and the cooling fan to cool the stack at the moment, when the APU judges that the temperature of the stack is lower than a third preset value, the APU controls the stack to stop and sends an APU shutdown state signal to the VCU, and the VCU guides the high-voltage system to power down.
Optionally, the step of performing, by the VCU, power down detection on the high voltage system according to the power down instruction further includes:
the VCU writes BMS, MCU, APU, air conditioning system controller and DCDC data into the memory and guides the low voltage system to sleep.
The embodiment of the present invention further provides a vehicle control unit, including:
the acquisition module is used for acquiring a power-on instruction or a power-off instruction;
and the control module is used for controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction or controlling the power-off system of the fuel cell automobile to be powered off according to the power-off instruction.
The embodiment of the invention also provides an electric automobile which comprises the whole automobile controller.
The embodiment of the invention has the beneficial effects that:
in the scheme, by establishing the signal interaction logic between the VCU and the BMS, between the VCU and the MCU, between the VCU and the APU, between the VCU and the air conditioning system controller and between the VCU and the DCDC, the monitoring of the whole high-voltage state of the whole vehicle by the VCU is realized, the working efficiency of the APU after the whole vehicle high-voltage system is electrified is improved, the risk of high-voltage discharge caused by the mismatching of the power-off time sequence of the whole vehicle and the power-off time sequence of the APU is eliminated, and the safety of the high-voltage system.
Drawings
FIG. 1 is a flow chart showing a method for controlling power on and power off of a fuel cell vehicle according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an exemplary power-on/power-off sequence control of a fuel cell vehicle according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of a vehicle control unit according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a power-on and power-off control method for a fuel cell vehicle, including:
step 11: and acquiring a power-on instruction or a power-off instruction.
The power-on command or the power-off command is manually recognized by a keyless system PEPS and a brake pedal signal through a driver, and command information is fed back to the VCU of the vehicle controller.
Step 12: and controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction or controlling the power-off system of the fuel cell automobile to be powered off according to the power-off instruction.
After a power-on instruction of a driver is identified based on a keyless system PEPS and a brake pedal signal, a VCU wakes up a BMS, a MCU, an APU, an air conditioning system controller (including an electric compressor controller EAS, a heating controller PTC, an electronic temperature control system ECC) and a DCDC in a whole vehicle running mode, power supply of a power battery is completed after self-checking of a low-voltage system and detection of a high-voltage system are faultless, temperature of a cell stack in the APU is judged, and after the temperature of the cell stack reaches a preset value, the operation is controlled, so that the high efficiency of energy conversion of the fuel battery is ensured.
After the power-off command of a driver is recognized based on a keyless system PEPS, the VCU receives the shutdown signal of the APU, guides the BMS, the MCU, the APU, the air-conditioning system controller and the DCDC to be dormant and actively powers off after the high-voltage system actively discharges and the high-voltage system detects the power failure and files data. According to the scheme, the operation state of the APU is controlled, and the high-voltage discharge risk caused by mismatching of the power-off time sequence of the whole vehicle and the power-off time sequence of the APU is avoided.
Further, the step of obtaining a power-on command or a power-off command includes:
the VCU of the vehicle controller obtains a power-on instruction or a power-off instruction through a keyless starting system and a brake pedal signal of the fuel cell vehicle.
In the embodiment, after the power-ON intention of a driver is acquired based ON a keyless start system and a brake pedal signal, ON power is provided for all controllers, a VCU is awakened through the ON power, the VCU performs controller data initialization, data in a memory are read, if an irresistible fault occurs in the last power-ON period, high voltage is prohibited to be applied, data before high voltage is applied to a vehicle is integrated, and if a power-off fault occurs, the VCU prohibits high voltage application to the system.
After the power-off intention of a driver is obtained based on the keyless starting system, the VCU firstly judges whether the APU is stopped or not, and guides the high-voltage system to power off after the APU is ensured to be stopped.
Further, the step of controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction comprises the following steps:
when the VCU judges that the whole vehicle mode of the fuel cell vehicle is in a driving mode according to the power-on instruction, the VCU wakes up a battery management system BMS, a driving motor controller MCU, a hydrogen system range extender APU, an air conditioning system controller and a direct current conversion controller DCDC;
and the VCU controls the BMS, the MCU, the APU, the air conditioning system controller and the DCDC to carry out low-voltage self-detection and control high-voltage system detection, and the electrification of the electrification system is completed.
In this embodiment, the entire vehicle mode of the fuel cell vehicle includes: remote mode, driving mode, slow charge mode, fast charge mode and BootLoader mode.
Further, the step that the VCU controls the BMS, the MCU, the APU, the air conditioning system controller and the DCDC to perform low-voltage self-test comprises the following steps:
the VCU wakes up the BMS, the MCU, the APU, the air conditioning system controller and the DCDC, and the woken-up controller carries out in-board low voltage self-detection in a mode of reading an in-board memory EEPROM of the corresponding low voltage controller;
the VCU and the BMS, the MCU, the APU, the air conditioning system controller and the DCDC carry out communication message interaction through the CAN bus, judge whether the communication between the VCU and the BMS, the MCU, the APU, the air conditioning system controller and the DCDC has a signal frame loss condition or not, and judge whether a battery cathode relay is normally in a disconnected state or not.
In this embodiment, the low-voltage controller performs self-checking and performs message interaction with the VCU, thereby implementing real-time monitoring of the working state of the low-voltage controller by the VCU.
Further, the step of the VCU controlling the BMS, the MCU, the APU, the air conditioning system controller, and the DCDC to perform the low voltage self-test further includes:
if the low-voltage controller board is normal, the CAN bus communication is normal and the battery cathode relay is in a normal disconnection state, the VCU controls the power battery cathode relay to be closed;
and if the VCU judges that the current high-voltage system has serious faults, the high voltage on the system is forbidden, the BMS, the MCU, the APU, the air-conditioning system controller, the DCDC and the self controller are guided to sleep, and the whole high-voltage system is powered off.
In the embodiment, the VCU performs corresponding processing in time according to the message interaction condition of the low-voltage controller self-detection, so that the system failure power-on caused by faults is avoided, and the power-on efficiency of the high-voltage system and the working efficiency of the APU after the whole vehicle system is powered on are effectively improved.
Further, the step of the VCU controlling the detection of the high voltage system includes:
the VCU controls the high-voltage self-checking of the power battery, wherein when the BMS judges that the pre-charging relay and the positive relay of the power battery have closing faults, the VCU guides the negative relay of the power battery to be disconnected;
whether the pre-charging relay is adhered or not is detected, if the fault exists, the BMS controls the anode relay to be disconnected, the VCU controls the cathode relay to be disconnected, and the high-voltage system is powered off.
In the embodiment, the VCU controls the high-voltage system to detect, so that the high-voltage system fault in the high-voltage electrifying process is found in time, the electrifying efficiency of the high-voltage system is effectively improved, and the safety of the high-voltage system is improved.
Further, the step of VCU control power battery high pressure self-checking still includes:
if the power battery pre-charging relay and the positive pole relay have no closing fault, the BMS controls the pre-charging relay of the power battery to be closed, the positive pole relay is controlled to be closed after a first preset time length, and the pre-charging relay is controlled to be opened after the next first preset time length.
In this embodiment, a pre-charging circuit is required in the high-voltage system circuit to prevent the high-voltage circuit from being instantly closed to generate a large current and burn out the relay. If the system does not detect that the pre-charging relay has adhesion faults, the high-voltage system is electrified and finished, the BMS provides corresponding power according to driving intentions, and the motor responds to the torque demand of the accelerator pedal.
Further, the power-on and power-off control method of the fuel cell automobile further comprises the following steps:
when the power-on state of the power-on system is up, when the VCU judges that the need of starting the APU of the hydrogen system range extender exists, acquiring the temperature of a galvanic pile in the APU;
when the temperature of the cell stack is lower than a first preset value, the VCU sends a cell stack heating signal to the APU, the APU system enters a heating mode, when the temperature of the cell stack is higher than a second preset value, the APU judges that the cell stack can work at high efficiency under the temperature, the APU sends an enabling state signal to the VCU, the VCU sends a working enabling signal to the APU, and at the moment, the power battery and the cell stack output power simultaneously.
In this embodiment, the stack heating signal may be a "stack heating enable flag bit," and when the battery SOC (state of charge) or the operating temperature of the battery cell is lower than a preset value, the VCU determines that the APU needs to be started, so that the power battery and the APU jointly supply power.
The VCU sends a pile heating signal, after the system enters a heating mode, the VCU controls the power battery to limit power and sends a driver reminding message to the instrument controller ICM to remind that the whole vehicle is in a power limiting state at present so that the vehicle runs under low power, when the APU judges that the pile can work at high efficiency at a temperature higher than a second preset value, the power limiting state mode is cancelled, the VCU sends a work enabling signal to the APU, and at the moment, the power battery and the pile output power at the same time. According to the scheme, the temperature of the electric pile in the APU is judged, so that the electric pile can work at a proper temperature, and the conversion efficiency of the fuel cell is improved.
Further, the step of controlling the power-off system of the fuel cell automobile to power off according to the power-off instruction comprises the following steps:
and the VCU guides the high-voltage system to be powered off, prohibits the direct-current conversion controller DCDC and the air-conditioning system controller from being enabled according to the power-off instruction, controls the MCU to enter a zero-torque mode, controls the BMS to control the positive relay of the battery to be disconnected, controls the VCU to actively discharge the high-voltage system and control the negative relay of the battery to be disconnected, performs power failure detection on the high-voltage system, and guides the BMS, the MCU, the APU, the air-conditioning system controller, DCDC dormancy and VCU self dormancy to finish power-off of the high-voltage system.
In this embodiment, the high voltage system releases the charge in the capacitor in the form of heat energy through the PTC, the OBC (vehicle-mounted battery charger), and the resistor in the MCU, thereby completing the MCU active discharge.
Further, the step of the VCU guiding the high-voltage system to be powered down according to the power-down instruction includes:
and the VCU sends an APU shutdown enabling signal to the APU, the VCU enters a waiting mode, the APU sends a cooling instruction to the cooling water pump and the cooling fan to cool the stack at the moment, when the APU judges that the temperature of the stack is lower than a third preset value, the APU controls the stack to stop and sends an APU shutdown state signal to the VCU, and the VCU guides the high-voltage system to power down.
In this embodiment, the APU shutdown enable signal may be an "APU shutdown enable flag," and the APU shutdown status signal may be an "APU shutdown status flag.
After the VCU enters the waiting mode, the APU controls the cooling system to continuously cool the galvanic pile, the high-temperature risk of the galvanic pile caused by a cooling mechanism after the galvanic pile stops working is prevented, and the discharging danger possibly caused by the fact that the power battery is disconnected and the APU is not disconnected and in a power generation state is effectively avoided by adding the waiting mode of the VCU.
Further, the step of the VCU performing power down detection on the high voltage system according to the power down instruction further includes:
the VCU writes BMS, MCU, APU, air conditioning system controller and DCDC data into the memory and guides the low voltage system to sleep.
In this embodiment, the power failure detection content of the low-voltage system is as follows: BMS ensures that battery pre-charge relay disconnection, anodal relay disconnection, and VCU ensures that the battery negative pole disconnects, detects the back of accomplishing, archives BMS, MCU, APU, air conditioning system controller and DCDC's data to when the controller was gone up to next time, handle and respond to this data.
The complete flow chart is shown in fig. 2:
after a power-on command is acquired based on the PEPS and the brake pedal signal, the VCU initializes the controller and reads data in the EEPROM, after no fault is ensured, the VCU judges the whole vehicle mode, if the VCU is in the driving mode, the VCU wakes up the BMS, the MCU, the APU, the air conditioning system controller and the DCDC, and if the VCU is not in the charging or remote mode, the VCU wakes up the BMS, the MCU, the APU, the air conditioning system; BMS, MCU, APU, air conditioning system controller and DCDC carry on the low-voltage self-test, if there is serious trouble then forbid the high-pressure on the system and VCU guides every controller to sleep, if there is no trouble, VCU controls the negative relay of the closed battery; after the low-voltage self-check is completed, the battery is subjected to high-voltage self-check, namely the BMS judges whether a pre-charging relay and a positive relay have a closing fault, if so, the VCU guides a negative relay of the battery to be disconnected, if not, the BMS controls the pre-charging relay to be closed, the positive relay is closed after a preset time (Tms), and the pre-charging relay is disconnected after the next preset time (Tms); after the high-voltage system detects that the pre-charging relay has no adhesion fault, the high-voltage system is electrified, and at the moment, the VCU judges whether the APU needs to be started for combined power supply.
After the system acquires a power-off command based on the PEPS, the VCU firstly judges whether the APU stops, if the APU stops, the VCU prohibits the DCDC from enabling and controls the motor torque to be zero; the BMS controls the MCU to actively discharge after the anode relay is disconnected; after the discharging is finished, the VCU guides the battery cathode relay to be disconnected, at the moment, the high-voltage system carries out power failure detection, and data archiving is carried out after no fault is ensured; after the VCU controls the low-voltage system to be powered off, the VCU actively powers off, and the power off is finished at the moment.
As shown in fig. 3, an embodiment of the present invention further provides a vehicle control unit, including:
an obtaining module 31, configured to obtain a power-on instruction or a power-off instruction;
in the embodiment, the power-on command or the power-off command is manually recognized by a keyless system PEPS and a brake pedal signal through a driver, and command information is fed back to the VCU of the vehicle controller. .
And the control module 32 is used for controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction or controlling the power-off system of the fuel cell automobile to be powered off according to the power-off instruction.
It should be noted that all the implementation manners in the above method embodiments are applicable to the embodiment of the vehicle control unit, and the same technical effect can be achieved. In the embodiment, after a power-on instruction of a driver is identified based on a keyless system PEPS and a brake pedal signal, a VCU wakes up a BMS, a MCU, an APU, an air conditioning system controller (including an electric compressor controller EAS, a heating controller PTC, an electronic temperature control system ECC) and a DCDC in a running mode of the whole vehicle, power supply of a power battery is completed after self-checking of a low-voltage system and detection of a high-voltage system are faultless, temperature of a cell stack in the APU is judged, and after the temperature of the cell stack reaches a preset value, the operation is controlled, so that the high efficiency of energy conversion of the fuel battery is ensured.
After recognizing the power-off command of the driver based on the keyless system PEPS, the VCU receives the shutdown information of the APU, guides the BMS, the MCU, the APU, the air-conditioning system controller and the DCDC to be in dormancy after the high-voltage system actively discharges and the high-voltage system detects the power failure and files data, and actively powers off. According to the scheme, the operation state of the APU is controlled, and the high-voltage discharge risk caused by mismatching of the power-off time sequence of the whole vehicle and the power-off time sequence of the APU is avoided.
The embodiment of the invention also provides an electric automobile which comprises the whole automobile controller.
According to the embodiment of the invention, the signal interaction logic method between the VCU and the BMS, between the VCU and the MCU, between the VCU and the APU, between the VCU and the air conditioning system controller and between the VCU and the DCDC is established, the monitoring of the whole high-voltage state of the whole vehicle by the VCU is realized based on the switching state of the APU, the working efficiency of the APU after the whole vehicle high-voltage system is electrified is improved, the high-voltage discharge risk caused by the power-off time sequence problem of the whole vehicle and the power-off time sequence problem of the APU is eliminated, and the safety of the high.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. A fuel cell vehicle power-on and power-off control method is characterized by comprising the following steps:
acquiring a power-on instruction or a power-off instruction;
controlling a power-on system of the fuel cell vehicle to be powered on according to the power-on instruction or controlling a power-off system of the fuel cell vehicle to be powered off according to the power-off instruction;
the step of obtaining the power-on instruction or the power-off instruction comprises the following steps:
the VCU of the vehicle controller acquires a power-on instruction or a power-off instruction through a keyless starting system and a brake pedal signal of the fuel cell vehicle;
the step of controlling the power-off system of the fuel cell automobile to power off according to the power-off instruction comprises the following steps:
the VCU guides the high-voltage system to be powered off, forbids the direct-current conversion controller DCDC and the air-conditioning system controller from being enabled according to the power-off instruction, controls the MCU to enter a zero-torque mode, controls the BMS to control the positive relay of the battery to be disconnected, controls the VCU to actively discharge the high-voltage system and control the negative relay of the battery to be disconnected, detects the power failure of the high-voltage system, and guides the BMS, the MCU, the APU, the air-conditioning system controller, the DCDC dormancy and the VCU to sleep per se to finish the power-off of the;
the VCU guides the high-voltage system to be powered down according to the power-down instruction and comprises the following steps:
and the VCU sends an APU enable shutdown signal to the APU, the VCU enters a waiting mode, the APU sends a cooling instruction to the cooling water pump and the cooling fan to cool the stack at the moment, when the APU judges that the temperature of the stack is lower than a third preset value, the APU controls the stack to stop and sends an APU shutdown state signal to the VCU, and the VCU guides the high-voltage system to power down.
2. The fuel cell vehicle power-on and power-off control method according to claim 1, wherein the step of controlling power-on of a power-on system of the fuel cell vehicle according to the power-on instruction includes:
when the VCU judges that the whole vehicle mode of the fuel cell vehicle is in a driving mode according to the power-on instruction, the VCU wakes up a battery management system BMS, a driving motor controller MCU, a hydrogen system range extender APU, an air conditioning system controller and a direct current conversion controller DCDC;
and the VCU controls the BMS, the MCU, the APU, the air conditioning system controller and the DCDC to carry out low-voltage self-detection and control high-voltage system detection, and the electrification of the electrification system is completed.
3. The method according to claim 2, wherein the step of the VCU controlling the BMS, the MCU, the APU, the air conditioning system controller, and the DCDC to perform the low voltage self-test includes:
the VCU wakes up the BMS, the MCU, the APU, the air conditioning system controller and the DCDC, and the woken-up controller carries out in-board low voltage self-detection in a mode of reading an in-board memory EEPROM of the corresponding low voltage controller;
the VCU and the BMS, the MCU, the APU, the air conditioning system controller and the DCDC carry out communication message interaction through the CAN bus, judge whether the communication between the VCU and the BMS, the MCU, the APU, the air conditioning system controller and the DCDC has a signal frame loss condition or not, and judge whether a battery cathode relay is normally in a disconnected state or not.
4. The method according to claim 3, wherein the step of the VCU controlling the BMS, the MCU, the APU, the air conditioning system controller and the DCDC to perform the low voltage self test further comprises the following steps:
if the low-voltage controller board is normal, the CAN bus communication is normal and the battery cathode relay is in a normal disconnection state, the VCU controls the power battery cathode relay to be closed;
and if the VCU judges that the current high-voltage system has serious faults, the high voltage on the system is forbidden, the BMS, the MCU, the APU, the air-conditioning system controller, the DCDC and the self controller are guided to sleep, and the whole high-voltage system is powered off.
5. The fuel cell vehicle power-on and power-off control method of claim 2, wherein the step of detecting the VCU control high-voltage system includes:
the VCU controls the high-voltage self-checking of the power battery, wherein when the BMS judges that the pre-charging relay and the positive relay of the power battery have closing faults, the VCU guides the negative relay of the power battery to be disconnected;
whether the pre-charging relay is adhered or not is detected, if the fault exists, the BMS controls the anode relay to be disconnected, the VCU controls the cathode relay to be disconnected, and the high-voltage system is powered off.
6. The fuel cell vehicle power on and power off control method of claim 5, wherein the step of the VCU controlling the power cell high voltage self test further comprises:
if the power battery pre-charging relay and the positive pole relay have no closing fault, the BMS controls the pre-charging relay of the power battery to be closed, the positive pole relay is controlled to be closed after a first preset time length, and the pre-charging relay is controlled to be opened after the next first preset time length.
7. The fuel cell vehicle power on/off control method according to claim 6, further comprising:
when the power-on state of the power-on system is up, when the VCU judges that the need of starting the APU of the hydrogen system range extender exists, acquiring the temperature of a galvanic pile in the APU;
when the temperature of the cell stack is lower than a first preset value, the VCU sends a cell stack heating signal to the APU, the APU system enters a heating mode, when the temperature of the cell stack is higher than a second preset value, the APU judges that the cell stack can work at high efficiency under the temperature, the APU sends an enabling state signal to the VCU, the VCU sends a working enabling signal to the APU, and at the moment, the power battery and the cell stack output power simultaneously.
8. The method for controlling power on and power off of a fuel cell vehicle according to claim 1, wherein the step of detecting power down of the high voltage system by the VCU according to the power off command further comprises:
the VCU writes BMS, MCU, APU, air conditioning system controller and DCDC data into the memory and guides the low voltage system to sleep.
9. A vehicle control unit, comprising:
the acquisition module is used for acquiring a power-on instruction or a power-off instruction;
the control module is used for controlling the power-on system of the fuel cell automobile to be powered on according to the power-on instruction or controlling the power-off system of the fuel cell automobile to be powered off according to the power-off instruction;
the VCU of the vehicle controller acquires a power-on instruction or a power-off instruction through a keyless starting system and a brake pedal signal of the fuel cell vehicle;
the VCU guides the high-voltage system to be powered off, forbids the direct-current conversion controller DCDC and the air-conditioning system controller from being enabled according to the power-off instruction, controls the MCU to enter a zero-torque mode, controls the BMS to control the positive relay of the battery to be disconnected, controls the VCU to actively discharge the high-voltage system and control the negative relay of the battery to be disconnected, detects the power failure of the high-voltage system, and guides the BMS, the MCU, the APU, the air-conditioning system controller, the DCDC dormancy and the VCU to sleep per se to finish the power-off of the;
and the VCU sends an APU shutdown enabling signal to the APU, the VCU enters a waiting mode, the APU sends a cooling instruction to the cooling water pump and the cooling fan to cool the stack at the moment, when the APU judges that the temperature of the stack is lower than a third preset value, the APU controls the stack to stop and sends an APU shutdown state signal to the VCU, and the VCU guides the high-voltage system to power down.
10. An electric vehicle, comprising: the vehicle control unit of claim 9.
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