CN112389202A - High-voltage distribution system of fuel cell bus and control method thereof - Google Patents
High-voltage distribution system of fuel cell bus and control method thereof Download PDFInfo
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- CN112389202A CN112389202A CN202011229842.6A CN202011229842A CN112389202A CN 112389202 A CN112389202 A CN 112389202A CN 202011229842 A CN202011229842 A CN 202011229842A CN 112389202 A CN112389202 A CN 112389202A
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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
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
- B60L58/14—Preventing excessive discharging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The utility model provides a fuel cell bus high voltage power distribution system, including the group battery, the battery block terminal, the fuel cell block terminal, five unification controllers, vehicle control unit and on-vehicle electrical equipment, the battery block terminal is including preventing the overdischarge contactor, five unification controllers include high voltage block terminal and DC/DC, the high voltage block terminal includes main contactor, the preliminary filling contactor, the DCDC contactor, main contactor, the preliminary filling contactor, the one end of DCDC contactor is connected with the group battery electricity after the overdischarge contactor, main contactor, the other end of preliminary filling contactor respectively with the fuel cell block terminal, on-vehicle electrical equipment electricity is connected, the fuel cell block terminal is connected with on-vehicle electrical equipment electricity, the one end of DCDC contactor is connected with the fuel cell block terminal electricity behind main contactor, the other end of DCDC contactor is connected with low voltage battery electricity behind DC/DC. The design not only has the function of over-discharge protection of the battery, but also improves the driving safety and reduces the cost.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a high-voltage power distribution system of a fuel cell bus and a control method thereof, which are mainly suitable for providing over-discharge protection for a power battery.
Background
The fuel cell hybrid electric vehicle is a typical one of new energy vehicles, and is characterized in that the generation of nitrogen oxides polluting the environment can be greatly reduced. The fuel cell hybrid electric vehicle generally adopts a fuel cell and a power cell as a dual-power system, and can switch different working conditions according to a preset program. The new energy automobile has more electrical equipment than the traditional automobile, and the whole automobile is provided with a high-voltage power transmission system besides a low-voltage power supply system, so that the high-voltage power distribution system is an indispensable important part of the new energy automobile, and has higher requirements on safety, controllability and maintainability. However, in the existing high-voltage distribution system, the adhesion of the contactor caused by the fault of the contactor in the four-in-one controller easily empties the electricity of the battery.
Disclosure of Invention
The invention aims to overcome the defects and problems of the prior art that the prior art does not have the power battery over-discharge protection function, and provides a fuel battery bus high-voltage distribution system with the power battery over-discharge protection function and a control method thereof.
In order to achieve the above purpose, the technical solution of the invention is as follows: a high-voltage power distribution system of a fuel cell bus comprises a battery pack, a battery distribution box, a fuel cell distribution box, a five-in-one controller, a vehicle control unit VCU and vehicle-mounted electrical equipment, wherein the battery pack comprises a power cell management system BMS which is in signal connection with the VCU, the battery distribution box comprises an anti-over-discharge contactor KM1 electrically connected with the VCU, the five-in-one controller comprises a high-voltage distribution box and a DC/DC, the high-voltage distribution box comprises a main contactor KM2, a pre-charging contactor KM3 and a DCDC contactor KM4 which are electrically connected with the VCU, one end of the main contactor KM2 is electrically connected with the battery pack after passing through a discharge contactor KM1, the other end of the main contactor KM2 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, and the fuel cell distribution box is electrically connected with the, one end of the pre-charging contactor KM3 is electrically connected with the battery pack after passing through the discharging contactor KM1, the other end of the pre-charging contactor KM3 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, one end of the DCDC contactor KM4 is electrically connected with the battery pack after passing through the discharging contactor KM1, the end of the DCDC contactor KM4 is electrically connected with the fuel cell distribution box after passing through the main contactor KM2, and the other end of the DCDC contactor KM4 is electrically connected with the low-voltage storage battery.
The high-voltage distribution box further comprises a pre-charging resistor, one end of the pre-charging resistor is electrically connected with the pre-charging contactor KM3, and the other end of the pre-charging resistor is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively.
The pre-charging resistor is a PTC resistor.
The five-in-one controller further comprises an inflating pump DC/AC, a rotary pump DC/AC and a motor controller, the vehicle-mounted electrical equipment comprises an inflating pump, an air conditioner, a rotary pump, an electric defroster and a driving motor, the inflating pump is respectively and electrically connected with a main contactor KM2, a pre-charging contactor KM3 and a fuel cell distribution box after sequentially passing through the inflating pump DC/AC and a first fuse FU1, the air conditioning is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after passing through a second fuse FU2, the rotary pump is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after sequentially passing through the rotary pump DC/AC and a third fuse FU3, the electric defroster is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after passing through a fourth fuse FU4, and the driving motor is, And a fifth fuse FU5 is electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box.
The DCDC contactor KM4 is electrically connected with DC/DC after passing through a number six fuse FU 6.
The VCU is used for detecting the states of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 and controlling the on and off of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM 4.
A control method for a high voltage distribution system of a fuel cell bus, the control method comprising the steps of:
when the vehicle is powered ON, when a key is turned to an ON gear, the VCU of the vehicle controller detects that no enabling signal exists in the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4, and closes the over-discharge prevention contactor KM 1;
when the power is OFF, when the key is turned to the OFF position, the VCU of the vehicle controller detects that the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 do not have enabling signals, and the over-discharge prevention contactor KM1 is disconnected.
During the driving process, the power battery management system BMS collects battery pack data in real time and performs data analysis and calculation, when the battery pack data are abnormal, the power battery management system BMS sends abnormal information to the VCU through CAN messages, the VCU disconnects the over-discharge prevention contactor KM1 according to the information sent by the BMS, at the moment, the main contactor KM2 and the DCDC contactor KM4 are both closed, the fuel battery provides an independent power source for the whole vehicle, and after the vehicle decelerates and stops stably, a power-off strategy is executed to disconnect the main contactor KM2 and the DCDC contactor KM 4.
Compared with the prior art, the invention has the beneficial effects that:
1. in the high-voltage power distribution system of the fuel cell bus and the control method thereof, the over-discharge prevention contactor KM1 is added in the high-voltage power distribution system, so that the rear-end power system can be completely cut off when power is off, the power of the battery cannot be discharged due to the adhesion of the contactor caused by the fault of the contactor in the controller, and the battery is well protected; meanwhile, when the battery has a serious fault, the battery limits the available discharge power to zero, and simultaneously requests the VCU of the vehicle controller to power off, the VCU of the vehicle controller disconnects the over-discharge prevention contactor KM1, and a power source required by the running of the vehicle is independently provided through a fuel battery system, so that the safe running function of the vehicle is maintained; in addition, the fuel cell shares the pre-charging loop of the high-voltage distribution system, so that the number of the pre-charging loops of the whole vehicle is reduced, and the cost is reduced. Therefore, the invention not only has the function of over-discharge protection of the battery, but also improves the driving safety and reduces the cost.
2. The invention relates to a high-voltage distribution system of a fuel cell bus and a control method thereof.A PTC pre-charging resistor is added in a pre-charging circuit, when pre-charging is carried out, if the rear end of a five-in-one controller breaks down, the pre-charging time is too long, the temperature of the PTC pre-charging resistor rises due to too large current, and the resistance value is increased, so that the current value in the pre-charging circuit is restrained, and the purpose of protecting rear-end vehicle-mounted electrical equipment is achieved. Therefore, the present invention has a function of protecting the in-vehicle electric device.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage power distribution system of a fuel cell bus.
Fig. 2 is a flow chart of a control method of a high-voltage distribution system of a fuel cell bus according to the invention.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, the high-voltage power distribution system of the fuel cell bus comprises a battery pack, a battery distribution box, a fuel cell distribution box, a five-in-one controller, a vehicle control unit VCU and vehicle-mounted electrical equipment, wherein the battery pack comprises a power battery management system BMS which is in signal connection with the vehicle control unit VCU, the battery distribution box comprises an anti-overdischarge contactor KM1 which is electrically connected with the vehicle control unit VCU, the five-in-one controller comprises the high-voltage distribution box and DC/DC, the high-voltage distribution box comprises a main contactor KM2, a pre-charging contactor KM3 and a DCDC contactor KM4 which are electrically connected with the vehicle control unit VCU, one end of the main contactor KM2 is electrically connected with the battery pack after passing through the overdischarge contactor KM1, the other end of the main contactor KM2 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, and the fuel cell distribution box, one end of the pre-charging contactor KM3 is electrically connected with the battery pack after passing through the discharging contactor KM1, the other end of the pre-charging contactor KM3 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, one end of the DCDC contactor KM4 is electrically connected with the battery pack after passing through the discharging contactor KM1, the end of the DCDC contactor KM4 is electrically connected with the fuel cell distribution box after passing through the main contactor KM2, and the other end of the DCDC contactor KM4 is electrically connected with the low-voltage storage battery.
The high-voltage distribution box further comprises a pre-charging resistor, one end of the pre-charging resistor is electrically connected with the pre-charging contactor KM3, and the other end of the pre-charging resistor is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively.
The pre-charging resistor is a PTC resistor.
The five-in-one controller further comprises an inflating pump DC/AC, a rotary pump DC/AC and a motor controller, the vehicle-mounted electrical equipment comprises an inflating pump, an air conditioner, a rotary pump, an electric defroster and a driving motor, the inflating pump is respectively and electrically connected with a main contactor KM2, a pre-charging contactor KM3 and a fuel cell distribution box after sequentially passing through the inflating pump DC/AC and a first fuse FU1, the air conditioning is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after passing through a second fuse FU2, the rotary pump is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after sequentially passing through the rotary pump DC/AC and a third fuse FU3, the electric defroster is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after passing through a fourth fuse FU4, and the driving motor is, And a fifth fuse FU5 is electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box.
The DCDC contactor KM4 is electrically connected with DC/DC after passing through a number six fuse FU 6.
The VCU is used for detecting the states of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 and controlling the on and off of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM 4.
A control method for a high voltage distribution system of a fuel cell bus, the control method comprising the steps of:
when the vehicle is powered ON, when a key is turned to an ON gear, the VCU of the vehicle controller detects that no enabling signal exists in the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4, and closes the over-discharge prevention contactor KM 1;
when the power is OFF, when the key is turned to the OFF position, the VCU of the vehicle controller detects that the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 do not have enabling signals, and the over-discharge prevention contactor KM1 is disconnected.
During the driving process, the power battery management system BMS collects battery pack data in real time and performs data analysis and calculation, when the battery pack data are abnormal, the power battery management system BMS sends abnormal information to the VCU through CAN messages, the VCU disconnects the over-discharge prevention contactor KM1 according to the information sent by the BMS, at the moment, the main contactor KM2 and the DCDC contactor KM4 are both closed, the fuel battery provides an independent power source for the whole vehicle, and after the vehicle decelerates and stops stably, a power-off strategy is executed to disconnect the main contactor KM2 and the DCDC contactor KM 4.
The principle of the invention is illustrated as follows:
the VCU of the vehicle controller has the functions of energy management and vehicle protection, can effectively distribute power energy of the vehicle, and realizes vehicle safety protection by adjusting power distribution and controlling the contactor when a fault occurs. The VCU of the vehicle control unit detects the available discharge power of the power battery in real time through the CAN bus message, and meanwhile, the power of the fuel battery system is obtained by comparing the SOP of the power battery according to the power demand of the current vehicle state calculation system.
The contactors (KM 1, KM2, KM3 and KM 4) have a state detection function, can feed back the current state (enabled, disabled or failed) of the contactor, and provide a basis for the VCU of the vehicle controller to execute related control.
The high-voltage input end of the fuel cell distribution box is connected in parallel at the rear end of the KM2 (the fuel cell distribution box is internally provided with a fuse), so that electric energy can be directly provided for electric equipment of the whole vehicle, and the driving safety is improved.
This design has the following advantages: 1. the high-voltage distribution system adopts a pre-charging loop, high-voltage accessories are all designed at the rear end of the pre-charging loop, enabling working signals of the high-voltage accessories are controlled by a vehicle control unit, and the enabling signals of the high-voltage accessories are guaranteed to be in a 0 state (no enabling) before high voltage is applied, and then pre-charging is carried out; before the high voltage is applied, the high voltage accessory enabling signal is canceled and delayed for a period of time; 2. the high-voltage distribution system adopts the PTC resistor as a pre-charging resistor, the pre-charging circuit is a soft start circuit, the PTC resistor is a resistor with the resistance value changing along with the temperature, and the resistance is larger when the temperature is higher, so that the high-voltage distribution system has an overcurrent self-protection function; 3. the fuel cell DCF shares the pre-charging loop of the high-voltage power distribution, so that the number of the pre-charging loops of the whole vehicle is reduced; 4. the high-voltage distribution loop is provided with a battery over-discharge protection circuit, and when the voltage of the battery is lower than the limit protection voltage of the battery, the front-end loop is automatically disconnected.
Example 1:
referring to fig. 1, the high-voltage power distribution system of the fuel cell bus comprises a battery pack, a battery distribution box, a fuel cell distribution box, a five-in-one controller, a vehicle control unit VCU and vehicle-mounted electrical equipment, wherein the battery pack comprises a power cell management system BMS which is in signal connection with the vehicle control unit VCU, the battery distribution box comprises an over-discharge prevention contactor KM1 which is electrically connected with the vehicle control unit VCU, the five-in-one controller comprises a high-voltage distribution box, an air pump DC/AC, a rotary pump DC/AC, a motor controller and a DC/DC, the high-voltage distribution box comprises a main contactor KM2, a pre-charging contactor KM3 and a DCDC contactor KM4 which are electrically connected with the vehicle control unit VCU, one end of the main contactor KM2 is electrically connected with the battery pack after passing through a discharge contactor KM1, and the other end of the main contactor KM2 is respectively connected with the fuel cell, The vehicle-mounted electrical equipment is electrically connected, the fuel cell distribution box is electrically connected with the vehicle-mounted electrical equipment, one end of the pre-charging contactor KM3 is electrically connected with the battery pack after passing through the discharging contactor KM1, the other end of the pre-charging contactor KM3 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, one end of the DCDC contactor KM4 is electrically connected with the battery pack after passing through the discharging contactor KM1, the end of the DCDC contactor KM 592 is electrically connected with the fuel cell distribution box after passing through the main contactor 387KM 2, and the other end of the DCDC contactor KM4 is electrically connected with the low-voltage;
the vehicle-mounted electrical equipment comprises an inflating pump, an air conditioner, a rotary pump, an electric defroster and a driving motor, the inflating pump is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after sequentially passing through the inflating pump DC/AC and a first fuse FU1, the air-conditioning second fuse FU2 is respectively electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box, the rotary pump is electrically connected with a main contactor KM2, a pre-charging contactor KM3 and a fuel cell distribution box respectively after sequentially passing through a rotary pump DC/AC and a third fuse FU3, the electric defroster is respectively and electrically connected with a main contactor KM2, a pre-charging contactor KM3 and a fuel cell distribution box through a fourth fuse FU4, the driving motor sequentially passes through a motor controller and a five-number fuse FU5 and then is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box;
the VCU is used for detecting the states of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 and controlling the on and off of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM 4.
Referring to fig. 2, a control method of a high-voltage distribution system of a fuel cell bus includes the following steps:
when the vehicle is powered ON, when a key is turned to an ON gear, the VCU of the vehicle controller detects that no enabling signal exists in the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4, and closes the over-discharge prevention contactor KM 1;
when the power is OFF, when the key is turned to an OFF gear, the VCU of the vehicle controller detects that the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 have no enabling signals, and disconnects the over-discharge prevention contactor KM 1;
during the driving process, the power battery management system BMS collects battery pack data in real time and performs data analysis and calculation, when the battery pack data are abnormal, the power battery management system BMS sends abnormal information to the VCU through CAN messages, the VCU disconnects the over-discharge prevention contactor KM1 according to the information sent by the BMS, at the moment, the main contactor KM2 and the DCDC contactor KM4 are both closed, the fuel battery provides an independent power source for the whole vehicle, and after the vehicle decelerates and stops stably, a power-off strategy is executed to disconnect the main contactor KM2 and the DCDC contactor KM 4.
Example 2:
the basic contents are the same as example 1, except that:
referring to fig. 1, the high-voltage distribution box further comprises a pre-charging resistor, one end of the pre-charging resistor is electrically connected with the pre-charging contactor KM3, and the other end of the pre-charging resistor is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively; the pre-charging resistor is a PTC resistor.
Claims (8)
1. A high-voltage power distribution system of a fuel cell bus is characterized by comprising a battery pack, a battery distribution box, a fuel cell distribution box, a five-in-one controller, a vehicle control unit VCU and vehicle-mounted electrical equipment, wherein the battery pack comprises a power cell management system BMS which is in signal connection with the vehicle control unit VCU, the battery distribution box comprises an over-discharge prevention contactor KM1 which is electrically connected with the vehicle control unit VCU, the five-in-one controller comprises the high-voltage distribution box and DC/DC, the high-voltage distribution box comprises a main contactor KM2, a pre-charging contactor KM3 and a DCDC contactor KM4 which are electrically connected with the vehicle control unit VCU, one end of the main contactor KM2 is electrically connected with the battery pack after passing through a discharging contactor KM1, the other end of the main contactor KM2 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, and the fuel cell, one end of the pre-charging contactor KM3 is electrically connected with the battery pack after passing through the discharging contactor KM1, the other end of the pre-charging contactor KM3 is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively, one end of the DCDC contactor KM4 is electrically connected with the battery pack after passing through the discharging contactor KM1, the end of the DCDC contactor KM4 is electrically connected with the fuel cell distribution box after passing through the main contactor KM2, and the other end of the DCDC contactor KM4 is electrically connected with the low-voltage storage battery.
2. The fuel cell bus high voltage power distribution system of claim 1, wherein: the high-voltage distribution box further comprises a pre-charging resistor, one end of the pre-charging resistor is electrically connected with the pre-charging contactor KM3, and the other end of the pre-charging resistor is electrically connected with the fuel cell distribution box and the vehicle-mounted electrical equipment respectively.
3. A fuel cell bus high voltage power distribution system as claimed in claim 2, wherein: the pre-charging resistor is a PTC resistor.
4. A fuel cell bus high voltage power distribution system as claimed in any one of claims 1 to 3, wherein: the five-in-one controller further comprises an inflating pump DC/AC, a rotary pump DC/AC and a motor controller, the vehicle-mounted electrical equipment comprises an inflating pump, an air conditioner, a rotary pump, an electric defroster and a driving motor, the inflating pump is respectively and electrically connected with a main contactor KM2, a pre-charging contactor KM3 and a fuel cell distribution box after sequentially passing through the inflating pump DC/AC and a first fuse FU1, the air conditioning is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after passing through a second fuse FU2, the rotary pump is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after sequentially passing through the rotary pump DC/AC and a third fuse FU3, the electric defroster is respectively and electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box after passing through a fourth fuse FU4, and the driving motor is, And a fifth fuse FU5 is electrically connected with the main contactor KM2, the pre-charging contactor KM3 and the fuel cell distribution box.
5. A fuel cell bus high voltage power distribution system as claimed in any one of claims 1 to 3, wherein: the DCDC contactor KM4 is electrically connected with DC/DC after passing through a number six fuse FU 6.
6. A fuel cell bus high voltage power distribution system as claimed in any one of claims 1 to 3, wherein: the VCU is used for detecting the states of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 and controlling the on and off of the over-discharge prevention contactor KM1, the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM 4.
7. A method of controlling a fuel cell bus high voltage distribution system according to claim 1, characterized in that: the control method comprises the following steps:
when the vehicle is powered ON, when a key is turned to an ON gear, the VCU of the vehicle controller detects that no enabling signal exists in the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4, and closes the over-discharge prevention contactor KM 1;
when the power is OFF, when the key is turned to the OFF position, the VCU of the vehicle controller detects that the main contactor KM2, the pre-charging contactor KM3 and the DCDC contactor KM4 do not have enabling signals, and the over-discharge prevention contactor KM1 is disconnected.
8. The method for controlling the high-voltage distribution system of the fuel cell bus according to claim 7, wherein the method comprises the following steps: during the driving process, the power battery management system BMS collects battery pack data in real time and performs data analysis and calculation, when the battery pack data are abnormal, the power battery management system BMS sends abnormal information to the VCU through CAN messages, the VCU disconnects the over-discharge prevention contactor KM1 according to the information sent by the BMS, at the moment, the main contactor KM2 and the DCDC contactor KM4 are both closed, the fuel battery provides an independent power source for the whole vehicle, and after the vehicle decelerates and stops stably, a power-off strategy is executed to disconnect the main contactor KM2 and the DCDC contactor KM 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011229842.6A CN112389202B (en) | 2020-11-06 | 2020-11-06 | High-voltage distribution system of fuel cell bus and control method thereof |
Applications Claiming Priority (1)
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| CN112389202B (en) | 2022-07-19 |
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