CN112590554A - Safety control system for fuel gas leakage of hydrogen energy automobile - Google Patents
Safety control system for fuel gas leakage of hydrogen energy automobile Download PDFInfo
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- CN112590554A CN112590554A CN202011535833.XA CN202011535833A CN112590554A CN 112590554 A CN112590554 A CN 112590554A CN 202011535833 A CN202011535833 A CN 202011535833A CN 112590554 A CN112590554 A CN 112590554A
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- 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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- 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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- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses a fuel gas leakage safety control system of a vehicle hydrogen energy automobile, which consists of an ECU, an information display system, an air conditioning system A/C, a vehicle body control system, a power battery system, a fuel gas engine system, a driving system and a fuel gas supply system, wherein the ECU is a vehicle electronic control unit and is responsible for acquiring the data of fuel gas concentration sensors at different positions of the vehicle, and adopting a proper control strategy to issue different control instructions to different systems according to the detection result of the fuel gas concentration and different working conditions of the vehicle, and the ECU is a control unit of a fuel gas power generation system and is one or two of an engine controller EMS, a whole vehicle controller VCU and a fuel cell controller FCU. When leakage occurs, the system adopts different control modes according to different leakage positions, simultaneously adopts different safe driving control strategies according to different current operating conditions of the whole vehicle, and adopts an automatic control mode to ensure the safety of the whole vehicle to the maximum extent by uniformly coordinating different systems from multiple aspects.
Description
Technical Field
The invention relates to the technical field of all gas vehicles such as hydrogen energy fuel cell vehicles, clean fuel engine vehicles and the like, in particular to a safety control system for gas leakage of a hydrogen energy automobile.
Background
With the increasing strictness of environmental protection and the stricter requirements of vehicle emission, various new energy vehicles and various clean fuel vehicles, such as hydraulic natural gas LNG, compressed natural gas CNG, liquefied petroleum gas LPG, methanol, dimethyl ether, hydrogen fuel cells, etc., are rapidly developed. At present, some clean fuel engine automobiles exist in the market, but some of the clean fuel engine automobiles are obtained by refitting, even if clean fuel engine automobiles, hydrogen fuel cell automobiles and the like which are brand-new and developed by a host factory do not have systematized complete fuel leakage safety treatment measures, the patent mainly aims at gas automobiles, and automatic safety control is carried out on the whole automobile through various effective measures when gas leakage occurs so as to reduce the occurrence of harm accidents.
Disclosure of Invention
The invention aims to provide a safety control system for fuel gas leakage of a hydrogen energy automobile, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a safety control system for fuel gas leakage of a hydrogen energy automobile comprises an ECU (electronic control Unit), an information display system, an air conditioning system A/C (or a thermal management system), an automobile body control system, a power battery system, a fuel gas engine system, a driving system and a fuel gas supply system, wherein the ECU is electrically connected with the information display system, the air conditioning system A/C, the automobile body control system, the power battery system, the fuel gas engine system, the driving system and the fuel gas supply system, the ECU is an electronic control unit of the automobile and is used for acquiring data of fuel gas concentration sensors at different positions of the automobile and issuing different control instructions to different systems by adopting a proper control strategy according to the detection result of the fuel gas concentration and different working conditions of the automobile, the ECU can be a control unit of the fuel gas power generation system, such as an engine controller EMS (electric energy management system), a vehicle controller VC, or may be implemented by two different controllers, such as EMS + VCU, FCU + MCU (motor controller), etc. Preferably, the information display system consists of an IC and an IVI, when gas leakage occurs, I C or the IVI lights up corresponding gas leakage alarm icons, different colors represent different leakage levels, and alarm is given in a mode of graph, character and voice broadcast.
Preferably, the air conditioning system a/C (or thermal management system) is composed of an air conditioning controller a/C (thermal management controller), and an execution unit blower, a fan and the like thereof. When gas leakage occurs, the air conditioning system A/C (or the thermal management system) controls the relevant execution units to complete relevant actions according to the ECU control instruction.
Preferably, the vehicle body control system comprises a vehicle body control module BCM and execution units thereof, namely a danger warning lamp, a brake lamp, a door lock, a vehicle window and the like, and when gas leakage occurs, the vehicle body control module controls the relevant execution units to complete corresponding actions required by the ECU.
Preferably, the power battery system is arranged on other types of vehicles such as a partial replacement fuel vehicle or a fuel cell hybrid vehicle, and the system comprises a power battery pack, a BMS (battery management system), a high-voltage contactor and the like, when gas leakage occurs, the BMS in the power battery pack controls the high-voltage contactor in the pack to be disconnected according to an ECU (electronic control unit) control command, and the power battery pack is ensured not to have high-voltage output outwards.
Preferably, the gas engine system refers to an engine mainly burning clean fuel or a fuel cell system, and when a serious leakage occurs, the gas engine system limits or stops power output according to an ECU power request.
Preferably, the driving system is composed of a driving motor controller, a driving motor and the like, and when gas leakage occurs, the driving system adopts different control strategies to ensure the safety of the vehicle according to different states and running conditions of all parts of the vehicle; or the driving system controls the vehicle power output according to the ECU control instruction. Preferably, the gas supply system comprises a gas storage tank, a gas supply control system, a valve of the gas supply control system, a pipeline and the like, and when secondary serious leakage occurs, the gas supply control system directly closes the valve to cut off gas supply, or the ECU directly controls the gas valve to be closed through a hard wire. Compared with the prior art, the invention has the beneficial effects that: according to the safety control system for the fuel gas leakage of the hydrogen energy automobile, when leakage occurs, different automatic control modes are adopted according to different leakage positions; different safe driving control modes are adopted according to different working conditions, different systems are coordinated uniformly from multiple aspects, an effective automatic control mode is adopted, and the safety of the whole vehicle is guaranteed to the maximum extent.
Drawings
FIG. 1 is a schematic structural diagram of a fuel gas leakage safety control system of a hydrogen energy automobile according to the present invention;
FIG. 2 is a schematic view of an exemplary gas leak alarm display of the present invention;
FIG. 3 is a schematic structural diagram of a control flow 1 according to the present invention;
fig. 4 is a schematic structural diagram of the control flow 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a safety control system for fuel gas leakage of a hydrogen energy automobile comprises an ECU, an information display system, an A/C (or thermal management system) of an air conditioning system, an automobile body control system, a power battery system, a fuel gas engine system, a driving system and a fuel gas supply system.
The ECU is one or more control systems of the vehicle and is responsible for collecting data of gas concentration sensors at different positions of the vehicle, and according to a gas concentration detection result and different working conditions of the vehicle, a proper control strategy is adopted to give different systems different control instructions, so that the safety of the whole vehicle after gas leakage is ensured. The ECU may be a control unit of the gas power generation system, such as an engine controller EMS, or a vehicle control unit VCU, or a fuel cell controller FCU, or two different controllers may jointly implement the function, such as EMS + VCU, or FCU + VCU, FCU + MCU (motor controller), and the like.
When gas leakage occurs, the IC and the IVI receive gas leakage alarm and leakage position information sent by the ECU through a communication cable, and the IC is lightened corresponding to a gas leakage alarm icon according to the information, and different leakage grades are represented by different colors. Yellow indicates a slight primary leak and red indicates a severe secondary leak. The icons are lightened and simultaneously carry out sound prompt, and the yellow icon is accompanied by one sound; the red color is accompanied with a plurality of sound prompts, the alarm frequency is accelerated, and simultaneously, the character + voice alarm prompt is carried out through IC or IVI: and if the gas is in danger of leakage, the vehicle should be stopped by the side within 30 seconds under safe driving, otherwise, the power is forcibly cut off. When gas leakage occurs, the synchronous started IVI can automatically pop up a gas leakage alarm page, as shown in the example of FIG. 2. In fig. 2, the arrangement positions of the gas concentration sensors in the vehicle are indicated, and each vehicle type at specific positions is different according to the vehicle type structure and the gas type, which is only schematic in the patent and focuses on explaining the alarm display mode. When the gas concentration sensor is green, the gas concentration is normal; when the color is yellow, the gas concentration is abnormal and is first-level slight leakage; the red color indicates that the fuel gas concentration is abnormal, and the fuel gas leaks seriously for the second level. When the gas concentration is abnormal, the sensor at the corresponding position can flicker synchronously at a certain frequency, such as yellow flicker and red flicker, except for color change. At the page of fig. 2, a text prompt explanation may also be added. When the yellow alarm is given, the text prompt is as follows: the concentration of the fuel gas is abnormal, slight leakage exists, the vehicle runs at reduced power, and the maintenance is required in time; when the red alarm is given, the text prompt is as follows: the gas concentration is abnormal, serious leakage exists, the vehicle should be stopped in 30 seconds under safe driving, and otherwise, the power is forcibly cut off. The above-mentioned time limit of 30 seconds is only an example, and is different according to each vehicle type, fuel used and technical scheme.
Air conditioning system A/C or thermal management system: the air conditioner controller comprises an air conditioner controller A/C or a thermal management controller, an execution unit blower, a fan and the like. When gas leakage occurs, the air conditioning controller or the thermal management controller receives a blower or/and fan starting request sent by the ECU through a communication cable, and if the blower or/and fan is not started, the air conditioning system A/C or the thermal management system controls the blower or the fan to be started to reach the peak rotating speed; if the blower or fan is turned on but not at peak speed, the air conditioning system A/C or thermal management system increases the blower or fan speed to a maximum value. After the blower or the fan is started, when the gas concentration returns to normal, the ECU sets the starting request to 0, and after the air-conditioning system A/C or the thermal management system receives the instruction change, the blower or the fan is controlled to return to the original state.
A vehicle body control system: the vehicle body control module BCM comprises a vehicle body control module BCM and an execution unit danger warning lamp, a brake lamp, a door lock, a vehicle window and the like. When gas leakage occurs, the vehicle body control module receives a vehicle window, door lock or related light control request sent by the ECU through a communication cable, and the vehicle body control module controls related execution units to finish corresponding actions required by the ECU, such as lighting a brake lamp, lighting a danger warning lamp, opening/closing a vehicle window, closing a low-voltage high-power device for supplying power, closing a low-voltage comfortable electric device and the like.
A power battery system: other types of vehicles, such as partially fuel-substituted vehicles or fuel cell hybrid vehicles, are equipped with a power battery system, which is composed of a power battery pack, and BMS, high voltage contactors, and the like. When the gas leakage happens, the BMS receives a power battery high-voltage cut-off request sent by the ECU through the communication cable, and the high-voltage contactor in the BMS control packet in the power battery packet is disconnected, so that the power battery packet is ensured not to have high-voltage output externally.
Gas engine system: mainly refers to engines mainly burning clean fuel, or fuel cell systems. In the event of a severe leak, the ECU sends a request for engine power output limit at an appropriate timing, and in the event of a severe leak the power output limit drops linearly to 0 over time. The gas engine system controls the power output of the engine according to the power output requirement of the ECU.
A driving system: mainly comprises a driving motor controller, a driving motor and the like. Hybrid vehicles or fuel cell vehicles may be equipped with a drive system. When gas leakage occurs, the ECU sends a gas leakage warning and the leakage grade thereof to the driving system through the communication cable, and the driving system adopts different control strategies to ensure the safety of the vehicle according to different states and running conditions of all parts of the vehicle; or the ECU adopts different control strategies to ensure the safety of the vehicle according to different states and running conditions of all parts of the vehicle, a specific power control requirement is sent to the driving system through the communication cable, and the driving system controls the power output of the vehicle according to a specific power control instruction sent by the ECU.
A gas supply system: mainly comprises a fuel gas storage tank, a fuel gas supply control system, a valve of the fuel gas supply control system, a pipeline and the like. When secondary serious leakage occurs, the ECU sends a request for cutting off the gas valve through a communication cable, and after the gas supply system receives the instruction, the gas supply control system closes the valve to cut off gas supply; or the ECU directly controls the closing of the gas valve in a hard wire mode.
When gas leakage occurs, the unified coordination control related to the 8 large control systems is as follows:
when the ECU detects that the gas concentration in the vehicle detected by the gas concentration sensor exceeds the normal range, different control instructions are sent to each system through the communication cable, and each system respectively executes and completes the related functions: the vehicle body control module forcibly opens the vehicle window; meanwhile, the air conditioning system or the thermal management system forcibly turns on the blower to the highest rotating speed to blow air in the vehicle, so that the air flow in the vehicle is accelerated, and harmful gas is forcibly discharged. If the blower is started but not reaches the highest rotating speed, the rotating speed of the blower is increased to increase the air volume. When the gas concentration sensor in the vehicle detects that the gas concentration is recovered to the normal range, the vehicle body control module recovers the vehicle window to the original state, and the air-conditioning system or the thermal management system recovers the air blower to the original state.
When ECU detects that the gas concentration sensor in the engine room before the car detects that the gas concentration exceeds the normal range, send different control commands to each system through the communication cable, each system carries out respectively and accomplishes relevant function: the air conditioning system or the thermal management system controls the fan in the front engine room to be started to the highest rotating speed, forced air blowing is carried out on the front engine room, and if the fan in the front engine room is started but does not reach the highest rotating speed, the rotating speed of the fan is increased, and the air volume is increased; and simultaneously, the vehicle body control module closes the vehicle window. And when the gas concentration sensor in the front engine room outside the automobile detects that the gas concentration is recovered to the normal range, the front engine room fan and the automobile window are recovered to the original state.
No matter the gas concentration is unusual in the car or outside the car, when taking place the one-level leakage trouble, ECU and gas engine system, actuating system descend power to go to whole car jointly, restrict the highest speed of a motor vehicle simultaneously, synchronous IC lights up gas leakage icon and corresponding sound warning suggestion, and multimedia system IVI shows relevant concrete alarm information and carries out voice broadcast and reports an emergency and asks for help or increased vigilance the suggestion. At the moment, the power output P of the whole vehicle isout＝min(P1，Pdmd): where P1 is the power limit at which the primary leakage fault occurs, P1＝k×Pmax，PmaxFor peak vehicle power, for a single-energy-source-driven vehicle, PmaxIs the peak power of a clean fuel engine or the maximum power of a hydrogen fuel cell system; for hybrid vehicles driven by multiple energy sources, PmaxIs the sum of the peak powers of the two energy sources. k is a limited power coefficient, k is less than 1, different values are adopted according to different running conditions of the vehicle, and smooth transition of vehicle control from a primary leakage fault to a secondary leakage fault is considered; pdmdThe value is the whole vehicle power output when the vehicle has no faults and is synthesized according to the opening degree of an accelerator pedal and the capacity output of related power driving components. The power output of the whole vehicle is calculated by the ECU. At reduced power output, i.e. PoutLess than the driver's desired output, i.e. P1 < PdmdIf the vehicle has a certain deceleration relatively to the last moment, the ECU sends a brake lamp lighting instruction to the vehicle body control system through the communication cable, the BCM synchronously lights the brake lamp for a period of time according to the ECU instruction to remind the following vehicle that the vehicle is in an automatic deceleration state, when the vehicle is in a constant speed or acceleration state, the ECU does not intervene in the control of the brake lamp, and the BCM controls the brake lamp to be turned off; when the power of the whole vehicle is reduced and output, the ECU synchronously sends a power reduction display instruction to the IC through the communication cable, the IC controls the power reduction display icon to be lightened after receiving the instruction, and when the vehicle has no gas leakage fault, the power reduction icon of the IC is extinguished. When a primary leakage fault occurs, the ECU sends fuel gas to the IC and the IVIAnd (3) giving a leakage alarm and leakage position information thereof, wherein the IC lights a gas leakage alarm icon or synchronously gives an alarm sound, and the IVI automatically pops up a vehicle gas leakage display interface if the vehicle is started, displays the specific position of gas leakage, gives a text prompt and the like.
No matter the gas concentration inside or outside the vehicle is abnormal, when a secondary leakage fault occurs, the ECU sends different control instructions to related systems through communication cables. After receiving a danger warning lamp lighting instruction of the ECU, the BCM controls the vehicle danger warning lamp to be always on to warn a rear vehicle that the vehicle has a fault; after the information display system receives the gas leakage warning relevant information of the ECU, the IC or IVI lights up a gas leakage icon and prompts a driver to stop at the side in time and prompt information such as power interruption and the like by corresponding sound, and the multimedia system IVI displays relevant specific warning information; and synchronously, directly cutting off power or linearly reducing the power output to 0 within a certain time by the ECU according to the vehicle state, forcibly terminating the power output and closing a gas valve, cutting off high pressure and the like when the vehicle speed is reduced to 0 or exceeds a time limit t, and sending a control command to control the door lock to be opened by the BCM. If a secondary leakage fault is found after a driver ignition starting request, the vehicle control system prohibits starting of a gas engine system or prohibits high-voltage power-on to enable the whole vehicle not to start running, and simultaneously, the power supply of a low-voltage high-power electric device or a low-voltage comfortable electric device and the like are turned off.
When the secondary leakage fault occurs no matter the gas concentration inside or outside the vehicle is abnormal, if the vehicle is running, the ECU controls the power output to be reduced to 0 within a certain time, and meanwhile, the stable transition of the power output in the normal mode and the fault mode is ensured, so that the driver has enough time to control the vehicle to safely stop while receiving the warning prompt. The power output control is specifically: pout＝min(P2，Pdmd) Wherein
t is the maximum time limit when the power output drops to 0 in the event of a secondary fault, and the time limit can be set at different times according to different vehicle speed ranges. Stopping at the side of driver and speedAfter the voltage drops to 0, the ECU sends a control instruction to disconnect a high-voltage contactor of the whole vehicle, close a gas engine system and close a gas supply valve so that the whole vehicle has high voltage to ensure the safety of the vehicle.
The main control flow charts are shown in fig. 3 and 4. Fig. 3 shows the control response mode of the vehicle body control system, the air conditioning system or the thermal management system and the information display system in the whole vehicle when a gas leakage fault occurs. FIG. 3: after the vehicle is ignited or powered on, the ECU judges whether the value of a gas concentration sensor at any position of the vehicle exceeds a normal range, if the gas concentration is normal, the flow F2 is entered, otherwise, the flow F3 is entered, and the flow F4 is executed synchronously. When the process flow F2 is entered, the vehicle body control system, the air conditioning system/thermal management system, and the information display system remain in the current state. In the process F3, the ECU determines whether the leak is in the vehicle, if so, the process F7 is performed, otherwise, the process F5 is performed. When the condition of the flow F1 is satisfied, F4 is synchronously executed in addition to the execution of the flow F3. In the process F4, the information display systems I C and IVI adopt different information prompting and alarming modes under different working conditions of the vehicle according to different gas leakage fault levels and leakage points. And when the vehicle enters a flow F7, the ECU sends a window opening instruction to the vehicle body control module, and the synchronous ECU sends an air blower opening instruction to the air conditioning system or the thermal management system. When entering the flow F5, the ECU judges whether the abnormal point of the gas concentration is in the front cabin outside the vehicle, if so, the flow F8 is entered, and if not, the flow F6 is entered. And when the vehicle enters a flow F8, the ECU sends a window closing instruction to the vehicle body control module, and the synchronous ECU sends a front cabin fan opening instruction to the air conditioning system or the thermal management system. When the process F6 is entered, the ECU judges whether the abnormal gas concentration point exists in the front cabin and the vehicle at the same time, if so, the process F9 is entered, otherwise, the process F2 is entered. And when the vehicle enters a flow F9, the ECU sends a window opening instruction to the vehicle body control module, and the synchronous ECU sends a front cabin fan opening instruction and a blower opening instruction to the air conditioning system or the thermal management system.
After the execution of the process F7 is completed, the next step is to execute the processes F10 and F11 synchronously. In a flow F10, after the vehicle body control module receives the window opening instruction of the ECU, if the window is opened, the current state is maintained; if the vehicle window is in a closed state, the vehicle window is controlled to be opened, and if the ECU detects that the concentration of the gas in the vehicle returns to normal, the control instruction of the ECU to the vehicle window returns to no control requirement, and at the moment, the vehicle body control module receives the instruction, and controls the vehicle window to return to the original manual control state. In a process F11, after the air conditioning system or the thermal management system receives an air blower opening instruction from the ECU, if the air blower is already opened, the air volume of the air blower is increased; if the blower is in a closed state, controlling the blower to be started, and if the ECU detects that the concentration of the gas in the vehicle is recovered to be normal in the period, recovering the control instruction of the ECU to the blower to be a non-control requirement, and controlling the blower to be recovered to an original manual control state when the air-conditioning system or the thermal management system receives the instruction; and if the air blower is in a closed state, controlling the air blower to be opened, after a period of time, if the ECU detects that the concentration of the gas in the vehicle is still abnormal, maintaining the required opening state of the control instruction of the ECU to the air blower for a long time, and controlling the air volume of the air blower to be in a maximum state by the air conditioning system or the thermal management system.
After the execution of the process F8 is completed, the next step is to execute the processes F12 and F13 synchronously. In a flow F12, after the vehicle body control module receives the window closing instruction of the ECU, if the window is closed, the current state is maintained; if the vehicle window is in an opening state, the vehicle window is controlled to be closed, if the ECU detects that the gas concentration in the front engine room returns to be normal in the period, the control instruction of the ECU to the vehicle window is returned to be a non-control requirement, and at the moment, the vehicle body control module controls the vehicle window to return to the original manual control state when receiving the instruction. In a process F13, after the air conditioning system or the thermal management system receives the front cabin fan opening instruction of the ECU, if the front cabin fan is already opened, the air volume of the front cabin fan is increased; if the front cabin fan is in a closed state, controlling the front cabin fan to be started, and if the ECU detects that the concentration of the fuel gas in the front cabin returns to normal in the period, the ECU returns the control instruction of the front cabin fan to a non-control requirement, and at the moment, when the air conditioning system or the thermal management system receives the instruction, controlling the front cabin fan to return to the original control state; if the front cabin fan is in a closed state, the front cabin fan is controlled to be started, after a period of time, if the ECU detects that the gas concentration in the front cabin is still abnormal, the ECU still maintains a required starting state for a long time for a control instruction of the front cabin fan, and the air conditioning system or the thermal management system controls the air volume of the front cabin fan to be in a maximum state at the moment.
After the execution of the process F9 is completed, the next step is to execute the processes F14 and F15 synchronously. In a flow F14, after the vehicle body control module receives the window opening instruction of the ECU, if the window is opened, the current state is maintained; if the window is in a closed state, controlling the window to be opened, and if the ECU detects that the gas concentration in the automobile is recovered to be normal and only the gas concentration in the front engine room is abnormal during the period, skipping to F5; if the ECU detects that the front cabin gas concentration returns to normal during this period and only the vehicle internal gas concentration is abnormal, the flow proceeds to F3.
In a process F15, after the air conditioning system or the thermal management system receives the blower on command and the front cabin fan on command from the ECU, the following are performed: if the blower is started, increasing the air volume of the blower; if the blower is in a closed state, controlling the blower to be started, and if the ECU detects that the concentration of the gas in the vehicle is recovered to be normal and only the concentration of the gas in the front engine room is abnormal during the period, skipping to F5; and if the air blower is in a closed state, controlling the air blower to be opened, after a period of time, if the ECU detects that the concentration of the gas in the vehicle is still abnormal, maintaining the required opening state of the control instruction of the ECU to the air blower for a long time, and controlling the air volume of the air blower to be in a maximum state by the air conditioning system or the thermal management system. ② for the front cabin fan: if the front engine room fan is started, increasing the air volume of the front engine room fan; if the front cabin fan is in a closed state, controlling the front cabin fan to be started, and if the ECU detects that the concentration of the fuel gas in the front cabin is recovered to be normal and only the concentration of the fuel gas in the vehicle is abnormal in the period, skipping to F3; if the front cabin fan is in a closed state, the front cabin fan is controlled to be started, after a period of time, if the ECU detects that the gas concentration in the front cabin is still abnormal, the ECU still maintains a required starting state for a long time for a control instruction of the front cabin fan, and the air conditioning system or the thermal management system controls the air volume of the front cabin fan to be in a maximum state at the moment.
Fig. 4 shows the control response mode of the vehicle body control system in the whole vehicle to the control of the relevant light and door lock and the control response mode of the driving/energy power system (at least comprising a power battery pack, a gas engine system, a driving system, a gas supply system and the like) when a gas leakage fault occurs. FIG. 4: after the vehicle is ignited or electrified and in the running process, the ECU monitors the gas concentration in real time, judges whether the gas concentration is in a normal range, and in a process S1, if the gas concentration has a primary fault, the process S4 is carried out, otherwise, the process S2 is carried out. When entering the process S4, the ECU sends the first-level alarm information of the gas concentration to the driving system or the energy power system, and the related controller of the driving system or the energy power system (the ECU such as VCU, MCU or EMS and other controllers) limits the maximum vehicle speed of the whole vehicle and the power output P of the vehicle according to the related component information of the whole vehicle and the running condition of the vehicleout＝min(P1，Pdmd). After the execution of S4 is completed, the process proceeds to S6, and the driving system executes corresponding actions according to the received control command of the superior controller: and limiting the maximum running vehicle speed and reducing the power for running. When the process S2 is started, if the gas concentration generates a secondary alarm, the process S5 is started, otherwise, the process S3 is started. And when the process flow enters S5, the ECU sends secondary fuel gas concentration alarm information to a driving system or an energy power system. When the flow advances to S3, the vehicle systems keep the current control state unchanged. In the process of executing the flow S6, S10 is synchronously executed, and the ECU, such as the VCU, the MCU or the EMS, etc., controls the controller to determine whether the current actual output power P1 is less than the maximum output capacity P of the driving system in normal and non-failure conditiondmdIf P1 < PdmdThe flow advances to S16, otherwise to S11. When the vehicle enters the process S16, if the vehicle has a certain deceleration relative to the last time, the ECU, such as a VCU, MCU, or EMS, and other controllers send a brake lamp lighting instruction to the vehicle body control module through a communication cable, the BCM lights the brake lamps synchronously for a period of time according to the ECU instruction to remind the following vehicle that the vehicle is in an automatic deceleration state, and when the vehicle is in a constant speed or acceleration state, the ECU cancels the intervention control of the brake lamps, and the BCM controls the brake lamps to be turned off.
When the flow proceeds to the flow S11, the vehicle body control module is maintainedThe current control state of the brake lamp is not changed. In the process of executing the process S5, S7 is executed synchronously, and the ECU, such as the VCU, the MCU, or the EMS, and other controllers, determines whether the vehicle is in the driver ignition start request state, if so, the process goes to the process S12, otherwise, the process goes to the process S8. When the process flow is S12, the ECU such as VCU, MCU or EMS and other controllers forbid the whole vehicle from high voltage power-up or forbid the gas starting, and sends the power supply closing instruction of the low voltage high power device and the entertainment electric device to the vehicle body control module or the related controllers, and the vehicle body control module or the related controllers receive the instruction and then close the power supply of the low voltage high power device and the entertainment electric device. When the process goes to S8, the ECU, such as VCU, MCU or EMS, etc., will determine whether the vehicle is in a driving state, i.e., whether the vehicle speed is greater than 0, if so, the processes S13 and S14 are executed synchronously, otherwise, the process goes to S9. When the process goes to the step S13, the vehicle body control module lights the hazard warning lamp to indicate that the vehicle is in a fault and is about to be unable to run. While executing the action S13, the process S14 is executed synchronously, and the ECU adjusts the power output control command P according to the current working condition of the vehicle and the states of all parts by a VCU, MCU or EMS and other controllersout＝min(P2，Pdmd) The vehicle power is reduced to 0 for a certain time (sufficient reaction time for the driver). After receiving a power control regulation instruction sent by the ECU, the driving system controls the power according to PoutAnd controlling the whole vehicle to run. When the process F9 is entered, the ECU, such as the VCU, the MCU, or the EMS, etc., may determine whether the vehicle is in a stationary state and in a high-voltage power-on state, or the gas engine system is started and the vehicle speed is 0, if so, the process S15 is entered, otherwise, the process returns to the process S5. In the execution process of S14, the driver should stop at the side in time under the prompt of IC/IVI until the vehicle speed is 0. If the driver does not stop at the side in time and exceeds the safety time limit, the driving system linearly reduces the power to 0 within the longest limit time until the power of the vehicle is interrupted, and finally the vehicle enters a free sliding state until the vehicle stops. After the vehicle speed drops to 0, the flow proceeds from S14 to S15. When entering the process S15, the ECU gives the whole vehicle high-voltage power-down or gas engine system closing, gas valve closing and door lock opening instructions to the controllers such as VCU, MCU or EMS, and controls the correspondingAnd the controller immediately executes the corresponding action after receiving the instruction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A safety control system for fuel gas leakage of a hydrogen energy automobile is characterized by comprising an ECU, an information display system, an air conditioning system A/C, an automobile body control system, a power battery system, a fuel gas engine system, a driving system and a fuel gas supply system, the ECU is electrically connected with an information display system, an air conditioning system A/C, a vehicle body control system, a power battery system, a gas engine system, a driving system and a gas supply system, the ECU is a vehicle electronic control unit, acquires the data of gas concentration sensors at different positions of the vehicle, according to the detection result of the gas concentration and different working conditions of the vehicle, a proper control strategy is adopted to send different control instructions to different systems, the ECU is a control unit of the gas power generation system and is one or two of an engine controller EMS, a vehicle control unit VCU and a fuel cell controller FCU.
2. The safety control system for the gas leakage of the hydrogen-powered automobile according to claim 1, characterized in that: the information display system is composed of an IC and an IVI, when gas leakage occurs, the IC and the IVI are lightened corresponding to gas leakage alarm icons, different colors represent different leakage grades, and alarm is given in a mode of graph, character and voice broadcasting.
3. The safety control system for the gas leakage of the hydrogen-powered automobile according to claim 1, characterized in that: the air conditioning system A/C comprises an air conditioning controller A/C and an execution unit thereof, and when gas leakage occurs, the air conditioning system A/C controls the execution unit to complete related actions according to an ECU control instruction.
4. The safety control system for the gas leakage of the hydrogen-powered automobile according to claim 1, characterized in that: the vehicle body control system comprises a vehicle body control module BCM and an execution unit thereof, wherein the execution unit comprises a danger warning lamp, a brake lamp, a door lock and a vehicle window, and when gas leakage occurs, the vehicle body control module controls the execution unit to complete corresponding actions required by an ECU.
5. The safety control system for the gas leakage of the hydrogen-powered automobile according to claim 1, characterized in that: the power battery system comprises a power battery pack, a BMS and a high-voltage contactor, when gas leakage occurs, the BMS in the power battery pack controls the disconnection of the high-voltage contactor in the pack according to an ECU control instruction, and the power battery pack is guaranteed to be unpowered to output.
6. The safety control system for the gas leakage of the hydrogen-powered automobile according to claim 1, characterized in that: the driving system comprises a driving motor controller and a driving motor, and when gas leakage occurs, the driving system adopts different control strategies to ensure the safety of the vehicle according to different states and running conditions of all parts of the vehicle; or the driving system controls the vehicle power output according to the ECU control instruction.
7. The safety control system for the gas leakage of the hydrogen-powered automobile according to claim 1, characterized in that: the fuel gas supply system comprises a fuel gas storage tank, a fuel gas supply control system, a valve and a pipeline thereof, and when secondary serious leakage occurs, the fuel gas supply control system directly closes the valve to cut off fuel gas supply or directly controls the closing of the fuel gas valve through hard wires by the ECU.
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