A hydrogen fuel commercial vehicle electronic control system and method

Abstract

The present invention discloses an electronic control system and method for a hydrogen fuel commercial vehicle, including: a hydrogen bottle group system, a hydrogen stack system and a vehicle controller VCU, the hydrogen bottle group system is connected to the hydrogen stack system, the hydrogen stack system is electrically connected to the boost DCDC, the boost DCDC is electrically connected to the hydrogen stack high-voltage power distribution, the hydrogen stack high-voltage power distribution is electrically connected to the power battery, the BMS controller and the pure electric high-voltage power distribution respectively, the pure electric high-voltage power distribution is electrically connected to the five-in-one DCAC controller and the five-in-one PDU controller respectively, and the five-in-one DCAC controller is electrically connected to the air pump; the hydrogen bottle group system, the hydrogen stack system, the boost DCDC, the BMS controller, the five-in-one PDU controller and the five-in-one DCAC controller are electrically connected to the vehicle controller VCU respectively. The present invention designs a response strategy for the electronic control system of hydrogen fuel commercial vehicles, specifically including various aspects of the electronic control system of hydrogen fuel commercial vehicles, covering the core functions of the normal operation of hydrogen fuel vehicles, and has the characteristics of simple functions, practicality, high efficiency and popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel electric vehicles, and in particular to an electronic control system and method for a hydrogen fuel commercial vehicle. Background Art

[0002] Hydrogen fuel new energy vehicles are increasingly receiving attention from the country and favored by various companies and manufacturers due to their advantages such as being pollution-free, easy to add fuel, and long driving range.

[0003] Hydrogen fuel vehicles are strictly speaking hybrid vehicles. They basically have two systems, namely the pure electric system and the hydrogen stack system. It is particularly important to control the two systems to operate efficiently and stably. There are many electronic control strategies for hydrogen fuel vehicle electronic control systems. According to the actual vehicle status, a simple, stable and efficient electronic control strategy is a friendly system. The existing electronic control systems of hydrogen fuel vehicles vary greatly in levels, some are very complex, and some are too simple. Based on the above problems, in order to solve the problems existing in the electronic control system of hydrogen fuel vehicles, it is urgent to develop a simple and efficient hydrogen fuel commercial vehicle electronic control system and method. Summary of the invention

[0004] The purpose of the present invention is to provide an electronic control system and method for a hydrogen fuel commercial vehicle, which sets a specific control method for starting, running, and shutting down the hydrogen stack during the use of the hydrogen fuel commercial vehicle, and combines the accessory control method to basically cover the core functions of the normal operation of the hydrogen fuel vehicle, and has the characteristics of simple function, practicality, high efficiency, and can be promoted and applied.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A hydrogen fuel commercial vehicle electronic control system, comprising: a hydrogen bottle group system, a hydrogen stack system and a vehicle controller VCU, wherein the hydrogen bottle group system is connected to the hydrogen stack system, the hydrogen stack system is electrically connected to a boost DCC, the boost DCC is electrically connected to a hydrogen stack high-voltage power distribution, the hydrogen stack high-voltage power distribution is electrically connected to a power battery, a BMS controller and a pure electric high-voltage power distribution, the pure electric high-voltage power distribution is electrically connected to a five-in-one DCAC controller and a five-in-one PDU controller, and the five-in-one DCAC controller is electrically connected to an air pump; the hydrogen bottle group system, the hydrogen stack system, the boost DCC, BMS controller and the pure electric high-voltage power distribution are electrically connected to a power battery, a BMS controller and a pure electric high-voltage power distribution, the pure electric high-voltage power distribution is electrically connected to a five-in-one DCAC controller and a five-in-one PDU controller, and the five-in-one DCAC controller is electrically connected to an air pump; The MS controller, five-in-one PDU controller and five-in-one DCAC controller are electrically connected to the vehicle controller VCU respectively; the BMS controller is used to detect the voltage, temperature and faults of the power battery cells in real time, and control the action of the relays in the hydrogen stack high-voltage distribution; the five-in-one PDU controller is used to control the action of the relays in the pure electric high-voltage distribution, collect the relay and sensor signals in the pure electric high-voltage distribution, and communicate with other controllers; the five-in-one DCAC controller is used to convert the DC high-voltage electricity obtained from the power battery into AC high-voltage electricity and transmit it to the air pump.

[0007] Optionally, it also includes an ignition switch, a special mode switch and front and rear axle air tanks, wherein the ignition switch, the special mode switch and the front and rear axle air tanks are electrically connected to the vehicle controller VCU respectively and send signals to the vehicle controller VCU, and the special mode switch is used to start the hydrogen stack system.

[0008] Optionally, reversible connections are formed between the power battery and the hydrogen stack high-voltage power distribution, between the hydrogen stack high-voltage power distribution and the BMS controller, between the hydrogen stack high-voltage power distribution and the boost DCDC, between the boost DCDC and the hydrogen stack system, and between the pure electric high-voltage power distribution and the five-in-one PDU controller.

[0009] The present invention also provides a method for controlling an electronic control system of a hydrogen fuel commercial vehicle, which is applied to the electronic control system of the hydrogen fuel commercial vehicle, and the method comprises the following steps:

[0010] S1, the initial state of the hydrogen stack system, the power supply of the hydrogen stack system, boost DCDC, and hydrogen bottle group system is not activated;

[0011] S2, determine whether the ignition switch is in the ON position;

[0012] S3, if yes, go to step S4; if no, go to step S1;

[0013] S4, enters the ON mode, the hydrogen stack system, boost DCDC, and hydrogen bottle group system power supply are activated, and the hydrogen stack system low-voltage 24V power supply is running;

[0014] S5, determine whether the dedicated mode switch signal is turned on, whether the SOC signal is less than 80%, whether the cooling water level of the hydrogen stack cooling system is normal, whether the hydrogen stack system fault is normal, whether the hydrogen bottle group system fault is normal, whether the remaining hydrogen amount is greater than or equal to 10%, and whether the hydrogen stack system mode feedback signal is standby;

[0015] S6, if all 7 conditions are yes, go to step S7; if not, go to step S4; if the hydrogen stack system mode feedback signal does not meet the requirements within a certain period of time, go to step S8;

[0016] S7, enter the vehicle controller VCU to send the start command state; real-time detection of the basic mode of the hydrogen stack system mode feedback signal is start, and whether the main relay state is disconnected;

[0017] If both conditions are yes, go to step S9.

[0018] If not, go to step S8;

[0019] S8, enters fault state 1, in which the vehicle controller VCU sends a standby command and a communication fault code;

[0020] S9, enter the state where the vehicle controller VCU sends a pre-charge relay closing command; real-time detection of whether the voltage behind the pre-charge relay is >= 90% of the total battery voltage;

[0021] If yes, go to step S10;

[0022] If not, go to step S11;

[0023] S10, enter the state where the vehicle controller VCU sends a main positive relay closing command; real-time detection of whether the main positive relay is closed;

[0024] If yes, go to step S12;

[0025] If not, go to step S11;

[0026] S11, enters fault state 2, in which the vehicle controller VCU sends a pre-charge and main positive relay disconnection command;

[0027] S12, enter the state of the vehicle controller VCU sending the pre-charge relay disconnect command; real-time detection of whether the basic mode of the hydrogen stack system mode feedback signal is startup and whether the main relay state is closed;

[0028] If both are yes, go to step S13;

[0029] If not, go to step S14;

[0030] S13, the vehicle controller VCU enters the state of sending a hydrogen stack operation enable command, and the hydrogen stack is running;

[0031] a. Real-time detection of whether there is an emergency shutdown request or a signal of excessive hydrogen concentration in the system;

[0032] If any of the conditions is yes, go to step S15;

[0033] If all are negative, maintain step S13;

[0034] b. Real-time detection of whether the dedicated mode switch signal is turned off, whether the SOC signal is >=90%, whether the remaining hydrogen volume is <=8%, whether the ignition switch is in the OFF position, and whether there is a fuel cell system fault code;

[0035] If any of the conditions is yes, go to step S14;

[0036] If all are negative, maintain step S13;

[0037] S14, entering the state where the vehicle controller VCU issues a normal shutdown command for the hydrogen stack;

[0038] S15, entering the state where the vehicle controller VCU issues a hydrogen stack emergency shutdown command;

[0039] S16, in the state of step S14 and step S15, real-time detection of whether the basic mode of the hydrogen stack system mode feedback signal is standby or emergency shutdown, and whether the main relay state is disconnected;

[0040] If yes, go to step S17;

[0041] If not, maintain step S15 for a certain period of time and then go to S17;

[0042] S17, enter the state where the vehicle controller VCU sends a main positive relay disconnect command;

[0043] S18, end.

[0044] Optionally, in step S13, the vehicle controller VCU sends a hydrogen stack operation enable command state, and the hydrogen stack is running. The hydrogen stack operation process control specifically includes:

[0045] S1301, enter the initial mode, the vehicle controller VCU sends a target power command of 0; real-time detection of the basic mode of the associated signal hydrogen stack system mode feedback signal is normal operation;

[0046] If yes, go to step S1302;

[0047] If not, maintain step S1301;

[0048] S1302, entering the normal mode, the vehicle controller VCU sends a command that the target power is a fixed value;

[0049] a. Real-time detection of the basic mode of the hydrogen stack system mode feedback signal of the associated signal to determine whether it is in power-limited operation;

[0050] If yes, go to step S1303;

[0051] If not, maintain step S1302;

[0052] b. Real-time detection of the associated signal SOC signal, whether it is >=85%, whether the remaining hydrogen volume is <=8%, whether there is a hydrogen stack system fault, and whether there is a hydrogen bottle group system fault;

[0053] If any of the conditions is yes, go to step S1304;

[0054] If not, maintain step S1302;

[0055] S1303, enter the power limit mode, the vehicle controller VCU sends a command that the target power is a factor of the limit; real-time detection of the associated signal SOC signal is >= 85%, the remaining hydrogen volume is <= 8%, whether there is a hydrogen stack system fault, whether there is a hydrogen bottle group system fault;

[0056] If any of the conditions is yes, go to step S1304;

[0057] S1304, enters fault mode, the vehicle controller VCU sends a target power command of 0,

[0058] S1305, in the power limiting mode or the fault mode, go to S1306;

[0059] S1306, end.

[0060] Optionally, during the operation of the hydrogen stack system, there is control of the whole vehicle electronically controlled accessories, and the whole vehicle electronically controlled accessories control method specifically includes:

[0061] A1, initial mode, the vehicle controller VCU sends the air pump working command to turn off; real-time detection of the associated signal vehicle is in high pressure or Ready state, and whether any of the front and rear axle brake reservoir air pressure signals is less than the minimum specified value;

[0062] If both are yes, go to step A2 or A3;

[0063] If no, maintain step A1;

[0064] A2, enters startup mode 0, and the vehicle controller VCU sends the air pump working command to start;

[0065] A3, enters startup mode 1, and the vehicle controller VCU sends the air pump working command to turn off;

[0066] A4, enter the original mode 0, the vehicle controller VCU sends the air pump working command to turn off or on;

[0067] A5, enter delay mode 0, the vehicle controller VCU sends the air pump working command to start;

[0068] a. Real-time detection of the delay of the associated signal for the specified time, and whether the air pressure signals of the front and rear axle brake reservoirs are both less than 0.8 times the maximum specified value;

[0069] If both are yes, go to step A4;

[0070] If no, continue with step A5;

[0071] b. Real-time detection of the air pressure signals of the brake reservoirs of the front and rear axles of the associated signals to see whether any of them is greater than 0.8 times the maximum specified value;

[0072] If yes, go to step A6;

[0073] If no, continue with step A5;

[0074] A6, enter delay mode 1, the vehicle controller VCU sends the air pump working command to turn off; real-time detection of the associated signal front and rear axle brake reservoir air pressure signal is any less than the minimum specified value;

[0075] If yes, go to step A4;

[0076] If no, continue with step A6;

[0077] A7: In the state of step A6 and A4, real-time detection of the associated signal vehicle controller VCU delay power off and whether the ignition switch is in the non-ON position;

[0078] If both are yes, go to step A5;

[0079] If no, maintain A6 and A4 status;

[0080] A8, end.

[0081] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: the electronic control system and method for hydrogen fuel commercial vehicles provided by the present invention are applied to the startup, operation, shutdown process, fault design processing process, and accessory control process of the hydrogen stack during the use of the vehicle; the fault design processing process is designed in the startup, operation, and shutdown process of the hydrogen stack; the hydrogen stack startup is associated with multiple signal states, first high voltage, then enable is issued to start it, and the hydrogen stack shutdown is divided into 2 modes, which are respectively associated with multiple signal states, and enable is issued to shut it down; in the fault design processing process, after the enable signal, if no feedback signal is received within the specified time, the fault mode is entered, and when the vehicle controller VCU issues these enable signals, the vehicle enters the fault mode. After the command, the hydrogen stack system did not feedback the correct system mode feedback signal, and entered the fault mode after a delay; during the operation of the hydrogen stack, after the hydrogen stack is started, it generates electricity in multiple operating modes according to the system status. The multiple operating modes are divided into three modes: normal mode, power limit mode and fault mode. The three modes are associated with related signal states for switching, and power generation is operated according to different target powers; during the accessory control process, the electronically controlled accessories are associated with multiple signal states for control, and the controller VCU is powered off and delayed to redesign the accessory air pump control. The air pump control is associated with the high-pressure state and the air pressure signal of the front and rear axle brake air tanks, and then the multi-state conversion is performed according to the ignition switch ON gear signal. The hydrogen fuel commercial vehicle electronic control system and method provided by the present invention designs a response strategy for the hydrogen fuel commercial vehicle electronic control system, specifically includes various aspects of the hydrogen fuel commercial vehicle electronic control system, basically covers the core functions of the normal operation of hydrogen fuel vehicles, and has the characteristics of simple functions, practicality, high efficiency, and can be promoted and applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0083] Figure 1 The module architecture diagram of the hydrogen fuel commercial vehicle electronic control system and method of the present invention;

[0084] Figure 2 It is a schematic diagram of the composition structure of the electronic control system of the hydrogen fuel commercial vehicle of the present invention;

[0085] Figure 3 The flowchart of the start-up and shutdown of the hydrogen stack control of the hydrogen fuel commercial vehicle electronic control system and method of the present invention;

[0086] Figure 4 The flowchart of the hydrogen stack operation control of the hydrogen fuel commercial vehicle electronic control system and method of the present invention;

[0087] Figure 5 The flowchart of the whole vehicle electronic control accessory control of the electronic control system and method of the hydrogen fuel commercial vehicle of the present invention;

[0088] Explanation of the accompanying reference numerals: 1. Power battery; 2. Hydrogen bottle group system; 3. Ignition switch; 4. Special mode switch; 5. Front and rear axle air tanks; 6. Vehicle controller VCU; 7. Air pump; 8. Five-in-one DCAC controller; 9. Pure electric high-voltage power distribution; 10. Five-in-one PDU controller; 11. BMS controller; 12. Hydrogen stack high-voltage power distribution; 13. Boost DCDC; 14. Hydrogen stack system. DETAILED DESCRIPTION

[0089] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0090] The purpose of the present invention is to provide an electronic control system and method for a hydrogen fuel commercial vehicle, which sets a specific control method for starting, running, and shutting down the hydrogen stack during the use of the hydrogen fuel commercial vehicle, and combines the accessory control method to basically cover the core functions of the normal operation of the hydrogen fuel vehicle, and has the characteristics of simple function, practicality, high efficiency, and can be promoted and applied.

[0091] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0092] The electronic control system of the hydrogen fuel commercial vehicle provided by the present invention is as follows: Figure 1 to Figure 2 As shown, it specifically includes: a hydrogen bottle group system 2, a hydrogen stack system 14, an ignition switch 3, a special mode switch 4, front and rear axle gas cylinders 5 and a vehicle controller VCU6, the hydrogen bottle group system 2 is connected to the hydrogen stack system 14, the hydrogen stack system 14 is electrically connected to the boost DCDC13, the boost DCDC13 is electrically connected to the hydrogen stack high-voltage distribution 12, the hydrogen stack high-voltage distribution 12 is electrically connected to the power battery 1, the BMS controller 11 and the pure electric high-voltage distribution 9 respectively, the pure electric high-voltage distribution 9 is electrically connected to the five-in-one DCAC controller 8 and the five-in-one PDU controller 10 respectively, and the five-in-one DCAC controller 8 is electrically connected to the air pump 7; the hydrogen bottle group system 2, the hydrogen stack system 14, the boost DCDC13, the BMS controller 11, the five-in-one PDU controller 10, the ignition switch 3, the special mode switch 4, the front and rear axle gas cylinders 5 and the five-in-one DCAC controller 8 are electrically connected to the vehicle controller VCU6 respectively;

[0093] The power battery 1 supplies high voltage electricity to the hydrogen stack high voltage distribution 12 and the pure electric high voltage distribution 9. The high voltage electricity between the hydrogen stack high voltage distribution 12 and the power battery 1 is reversible, and irreversible with the pure electric high voltage distribution 9; the hydrogen stack high voltage distribution 12 supplies high voltage electricity to the boost DCDC 13, and it is reversible; the boost DCDC 13 supplies high voltage electricity to the hydrogen stack system 14, and it is reversible; the hydrogen bottle group system 2 supplies hydrogen to the hydrogen stack system 14, and it is irreversible; the pure electric high voltage distribution 9 supplies high voltage electricity to the five-in-one DCAC controller 8, and it is irreversible; the five-in-one DCAC controller 8 supplies high voltage electricity to the air pump 7, and it is irreversible;

[0094] The vehicle controller VCU6 receives the signals of the ignition switch 3, the dedicated mode switch 4 (in the instrument panel), and the front and rear axle gas tanks 5, and communicates with the BMS controller 11, the five-in-one PDU controller 10, the five-in-one DCAC controller 8, the boost DCDC13, the hydrogen stack system 14, and the hydrogen bottle group system 2 to control and mobilize normal operation; the ignition switch 3 is the vehicle key switch, which controls the power on and off of the vehicle; the dedicated mode switch 4 (in the instrument panel) is specially set for hydrogen fuel commercial vehicles. The hydrogen stack system 14 can be started by pressing the button. If the button is not operated, the vehicle is in pure electric mode; the front and rear axle gas tanks 5 are specially set for hydrogen fuel commercial vehicles. The front and rear wheel brakes store gas to maintain a certain pressure; the vehicle controller VCU6 is the brain of the hydrogen fuel commercial vehicle, communicating with each electronic control subsystem, controlling all electronic control subsystems of the vehicle, and ensuring the normal and efficient operation of each system; the power battery 1 is the energy reserve of the hydrogen fuel commercial vehicle, providing the required high voltage electricity for the core electronic control subsystem, and can be discharged or charged; the BMS controller 11 is the power battery management system, which is used to detect the single cell voltage, temperature and fault of the power battery 1 in real time, and control the action of the relay in the hydrogen stack high-voltage distribution; the hydrogen stack high-voltage distribution 12 is used to supply part of the power of the power battery 1 to the hydrogen stack system 14 and part to the pure electric system, It is equipped with multiple relays and sensors inside to control the high-voltage power supply of the hydrogen stack system 14 and detect the voltage before and after the relay; the boost DCDC13 is used to increase the voltage and boost the hydrogen stack system 14 after generating electricity to ensure that it is consistent with the voltage of the power battery 1, to charge the power battery 1 or to power the pure electric system; the hydrogen stack system 14 is a hydrogen power generation component and the core system of hydrogen fuel commercial vehicles; the hydrogen bottle group system 2 is a hydrogen storage component that can store high-pressure hydrogen and detect parameters such as hydrogen pressure, flow, and hydrogen leakage; the pure electric high-voltage power distribution 9 is used to distribute the high-voltage electricity of the power battery 1 to the main drive motor system, the The air pump 7, steering pump, air conditioner, defrost and other components are equipped with multiple relays and sensors inside to control the high-voltage power supply of multiple subsystems and detect the voltage before and after the relay; the five-in-one PDU controller 10 is used to control the relays in the pure electric high-voltage power distribution 9, and can obtain the relay and sensor signals in the pure electric high-voltage power distribution 9, and communicate with other controllers; the five-in-one DCAC controller 8 is used to convert the DC high-voltage electricity obtained from the power battery 1 into the AC power (voltage and frequency meet) required by the air pump 7, and supply it to the air pump 7; after the air pump 7 is running, it outputs gas with flow and pressure into the gas storage tank for use by the air pressure equipment in the whole vehicle;

[0095] The control method of the electronic control system of a hydrogen fuel commercial vehicle provided by the present invention includes starting and shutting down the hydrogen stack control, hydrogen stack operation control, and vehicle electronic control accessory control;

[0096] like Figure 3As shown, it is a work flow chart for starting and shutting down the hydrogen stack control of the hydrogen fuel commercial vehicle electronic control system and method of the present invention, and is also a fault design processing flow chart, and the specific steps are: the hydrogen stack system 14 is initialized, and the power supply of the hydrogen stack system 14, the boost DCDC13, and the hydrogen bottle group system 2 is not activated; when starting to run, first determine whether the ignition switch 3 is in the ON position, if it is in the ON position, enter the ON position mode, the hydrogen stack system 14, the boost DCDC13, and the hydrogen bottle group system 2 power supply are activated, and the hydrogen stack system 14 low-voltage 24V power supply is operated; it is not in the ON position, the hydrogen stack system 14 is in the initial state; in the ON position mode, real-time detection is performed to determine whether the signal of the dedicated mode switch 4 is turned on, whether the SOC signal is less than 80%, and whether the cooling water level of the hydrogen stack cooling system is Whether it is normal, whether the hydrogen stack system 14 fault is normal, whether the hydrogen bottle group system 2 fault is normal, whether the remaining hydrogen volume is >= 10%, whether the hydrogen stack system 14 mode feedback signal is in standby mode. If all 7 conditions are met, the vehicle controller VCU6 enters the start command state. If any of the 7 conditions does not meet the requirements, maintain the ON gear mode. Among the 7 conditions, the hydrogen stack system 14 mode feedback signal does not meet the requirements within a certain period of time, and enters fault state 1. In this state, the vehicle controller VCU6 sends a standby command and a communication fault code; when the vehicle controller VCU6 sends a start command, it detects in real time whether the basic mode of the hydrogen stack system 14 mode feedback signal is start-up and whether the main relay state is disconnected. If both conditions are met, enter the whole The vehicle controller VCU6 sends a pre-charge relay closing command state. If any of the two conditions is not met within a certain period of time, it enters fault state 1; when the vehicle controller VCU6 sends a pre-charge relay closing command state, it detects in real time whether the voltage behind the pre-charge relay is >= 90% of the total battery voltage. If the condition is met, it enters the vehicle controller VCU6 sending a main positive relay closing command state. If the condition is not met, it enters fault state 2. In this state, the vehicle controller VCU6 sends a pre-charge and main positive relay disconnection command; when the vehicle controller VCU6 sends a main positive relay closing command state, it detects in real time whether the main positive relay is closed. If the condition is met, it enters the vehicle controller VCU6 sending a pre-charge relay disconnection command state. If the condition is not met, Enter fault state 2; when the vehicle controller VCU6 sends the pre-charge relay disconnect command state, it detects in real time whether the basic mode of the hydrogen stack system 14 mode feedback signal is started and whether the main relay state is closed. If both conditions are met, the vehicle controller VCU6 enters the hydrogen stack operation enable command state. If any of the two conditions is not met within a certain period of time, the vehicle controller VCU6 enters the hydrogen stack normal shutdown command state; when the vehicle controller VCU6 sends the hydrogen stack operation enable command state, it detects in real time whether there is an emergency shutdown request and whether there is a system hydrogen concentration over-limit signal. If either of the two conditions is met, the vehicle controller VCU6 enters the hydrogen stack emergency shutdown command state. If both conditions are not met, the original state is maintained;Real-time detection of whether the signal of the dedicated mode switch 4 is turned off, whether the SOC signal is >= 90%, whether the remaining hydrogen amount is <= 8%, whether the ignition switch 3 is in the OFF position, and whether there is a fuel cell system fault code (except the hydrogen concentration over-limit signal code). If any of the five conditions is met, the vehicle controller VCU6 enters the normal shutdown command state of the hydrogen stack. If all five conditions are not met, the original state is maintained; when the vehicle controller VCU6 sends the hydrogen stack emergency shutdown command and the normal shutdown command state, it is detected in real time whether the basic mode of the hydrogen stack system 14 mode feedback signal is standby or emergency shutdown, and whether the main relay state is disconnected. If the conditions are met, the vehicle controller VCU6 enters the main positive relay disconnection command state, and then the whole process is terminated. If the conditions are not met, the original state is maintained for a certain period of time, and then the vehicle controller VCU6 enters the main positive relay disconnection command state, and then the whole process is terminated;

[0097] like Figure 4 As shown, it is a work flow chart of the hydrogen stack operation control of the hydrogen fuel commercial vehicle electronic control system and method of the present invention. The flowchart describes in detail the functions of the hydrogen stack operation status. The specific steps are: the hydrogen stack operation status, after starting, enters the initial mode, the vehicle controller VCU6 sends a target power of 0 command, in the initial mode, real-time detection of the associated signal hydrogen stack system 14 mode feedback signal basic mode is normal operation, if the conditions are met, enter the normal mode, the vehicle controller VCU6 sends a target power of fixed value command, if the conditions are not met, maintain the original state; in the normal mode, real-time detection of the associated signal hydrogen stack system 14 mode feedback signal basic mode is normal operation. Check whether the basic mode of the feedback signal is limited power operation. If the condition is met, enter the limited power mode, and the vehicle controller VCU6 sends a command with the target power being the coefficient of the limit. If the condition is not met, maintain the original state; real-time detection of the associated signal SOC signal is >= 85%, whether the remaining hydrogen volume is <= 8%, whether there is a fault in the hydrogen stack system 14, and whether there is a fault in the hydrogen bottle group system 2. If any of the conditions is met, enter the fault mode, and the vehicle controller VCU6 sends a command with the target power being 0. If the condition is not met, maintain the original state; in the limited power mode, if the conditions for entering the fault mode are met, it will also enter the fault mode and the process ends;

[0098] like Figure 1 As shown, during the operation of the hydrogen stack system 14, there is a vehicle electronic control accessory control. To ensure the normal purging and shutdown of the hydrogen stack system 14, the vehicle controller VCU6 needs to delay powering off for a certain period of time. The delayed powering off of the VCU requires redesigning the accessory air pump control.

[0099] like Figure 5The figure is a working flow chart of the whole vehicle electronic control accessory control of the hydrogen fuel commercial vehicle electronic control system and method of the present invention; specifically: the process starts and enters the initial mode, the whole vehicle controller VCU6 sends the air pump 7 a working command to turn off, in the initial mode, the associated signal is detected in real time to see whether the whole vehicle is in high pressure or Ready state, and whether any of the front and rear axle brake air reservoir air pressure signals is less than the minimum specified value, if both conditions are met, enter the start mode 0, the whole vehicle controller VCU6 sends the air pump 7 a working command to turn on, if the conditions are not met, maintain the original state; start mode 1 and start mode 0 can be converted to each other, the condition is that under the high pressure state, it is determined according to the front and rear axle brake air reservoir air pressure signals, the start mode 1 and start mode 0 states are the original mode 0, the whole vehicle controller VCU6 sends the air pump 7 a working command to turn off or on; the original mode 0 unconditionally enters the delay mode 0, the whole vehicle controller VCU6 sends the air pump 7 a working command to turn on. Turn on; in delay mode 0, detect in real time whether the associated signal delays the specified time, and whether the air pressure signals of the front and rear axle brake reservoirs are both less than 0.8 times the maximum specified value. If both conditions are met at the same time, enter original mode 0, if not, maintain the original state; detect in real time whether any of the associated signal's front and rear axle brake reservoir air pressure signals is greater than 0.8 times the maximum specified value. If the conditions are met, enter delay mode 1, and the vehicle controller VCU6 sends an air pump work command to turn off, if not, maintain the original state; in delay mode 1, detect in real time whether any of the associated signal's front and rear axle brake reservoir air pressure signals is less than the minimum specified value. If the conditions are met, enter original mode 0, if not, maintain the original state; in delay mode 1 and original mode 0, detect in real time whether the associated signal's vehicle controller VCU6 delays power-off and whether the ignition switch 3 is not in the ON position. If both conditions are met, enter delay mode 0, if not, maintain the original state, and the process ends.

[0100] The electronic control system and method for hydrogen fuel commercial vehicles provided by the present invention are applied to the startup, operation, shutdown process, fault design processing process, and accessory control process of the hydrogen stack during the use of the vehicle; the fault design processing process is designed in the startup, operation, and shutdown process of the hydrogen stack; the hydrogen stack startup is associated with multiple signal states, first high voltage, then enable is issued to start it, and the hydrogen stack shutdown is divided into two modes, which are respectively associated with multiple signal states, and enable is issued to shut it down; in the fault design processing process, after the enable signal, if no feedback signal is received within the specified time, the fault mode is entered. When the vehicle controller VCU issues these enable commands, the hydrogen stack system does not feedback positive The correct system mode feedback signal is received, and the fault mode is entered after a delay. During the operation of the hydrogen stack, after the hydrogen stack is started, power is generated in multiple operating modes according to the system status. The multiple operating modes are divided into three modes: normal mode, power-limited mode and fault mode. The three modes are switched in association with related signal states, and power is generated according to different target powers. During the accessory control process, the electronically controlled accessories are controlled in association with multiple signal states, and the controller VCU is powered off and delayed to redesign the accessory air pump control. The air pump control is associated with the high-pressure state and the air pressure signal of the front and rear axle brake air reservoirs, and then the multi-state conversion is performed according to the ignition switch ON gear signal. The hydrogen fuel commercial vehicle electronic control system and method provided by the present invention designs a response strategy for the hydrogen fuel commercial vehicle electronic control system, specifically including various aspects of the hydrogen fuel commercial vehicle electronic control system, basically covering the core functions of the normal operation of hydrogen fuel vehicles, and has the characteristics of simple functions, practicality, high efficiency, and can be promoted and applied.

[0101] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydrogen fuel commercial vehicle electronic control system, characterized in that: include: A hydrogen bottle group system (2), a hydrogen stack system (14) and a vehicle controller VCU (6), wherein the hydrogen bottle group system (2) is connected to the hydrogen stack system (14), the hydrogen stack system (14) is electrically connected to a boost DCDC (13), the boost DCDC (13) is electrically connected to a hydrogen stack high-voltage power distribution (12), the hydrogen stack high-voltage power distribution (12) is electrically connected to a power battery (1), a BMS controller (11) and a pure electric high-voltage power distribution (9), respectively, the pure electric high-voltage power distribution (9) is electrically connected to a five-in-one DCAC controller (8) and a five-in-one PDU controller (10), respectively, and the five-in-one DCAC controller (8) is electrically connected to an air pump (7); the hydrogen bottle group system (2), the hydrogen stack system (14), The boost DCDC (13), the BMS controller (11), the five-in-one PDU controller (10) and the five-in-one DCAC controller (8) are electrically connected to the vehicle controller VCU (6) respectively; the BMS controller (11) is used to detect the voltage, temperature and fault of the power battery (1) in real time, and control the action of the relays in the hydrogen stack high-voltage distribution (12); the five-in-one PDU controller (10) is used to control the action of the relays in the pure electric high-voltage distribution (9), and collect the relay and sensor signals in the pure electric high-voltage distribution (9); the five-in-one DCAC controller (8) is used to convert the DC high-voltage electricity obtained from the power battery (1) into AC high-voltage electricity and transmit it to the air pump (7); The electronic control system further comprises an ignition switch (3), a special mode switch (4) and front and rear axle gas cylinders (5), wherein the ignition switch (3), the special mode switch (4) and the front and rear axle gas cylinders (5) are respectively electrically connected to the vehicle controller VCU (6) and send signals to the vehicle controller VCU (6), and the special mode switch (4) is used to start the hydrogen stack system (14); Control method of the electronic control system The following steps are involved: S1, the initial state of the hydrogen stack system (14), the power supply of the hydrogen stack system (14), the boost DCDC (13), and the hydrogen bottle group system (2) is not activated; S2, determining whether the ignition switch (3) is in the ON position; S3, if yes, go to step S4; if no, go to step S1; S4, enters the ON gear mode, the hydrogen stack system (14), boost DCDC (13), and hydrogen bottle group system (2) power supply are activated, and the hydrogen stack system (14) low voltage 24V power supply is in operation; S5, judging whether the signal of the dedicated mode switch (4) is turned on, whether the SOC signal is less than 80%, whether the cooling water level of the hydrogen stack cooling system is normal, whether the fault of the hydrogen stack system (14) is normal, whether the fault of the hydrogen bottle group system (2) is normal, whether the remaining hydrogen amount is greater than or equal to 10%, and whether the mode feedback signal of the hydrogen stack system (14) is in standby; S6, if all 7 conditions are yes, go to step S7; if not, go to step S4; if the hydrogen stack system (14) mode feedback signal does not meet the requirements within a certain period of time, go to step S8; S7, enter the vehicle controller VCU (6) to send a start command state; real-time detection of the hydrogen stack system (14) mode feedback signal basic mode is start, whether the main relay state is disconnected; If both conditions are yes, go to step S9. If not, go to step S8; S8, enters fault state 1, in which the vehicle controller VCU (6) sends a standby command and a communication fault code; S9, entering the state where the vehicle controller VCU (6) issues a pre-charge relay closing command; Real-time detection of whether the voltage after the pre-charge relay is >= 90% of the total battery voltage; If yes, go to step S10; If not, go to step S11; S10, entering the state where the vehicle controller VCU (6) issues a main positive relay closing command; Real-time detection of whether the main positive relay is closed; If yes, go to step S12; If not, go to step S11; S11, enters fault state 2, in which the vehicle controller VCU (6) sends a pre-charge and main positive relay disconnection command; S12, entering the vehicle controller VCU (6) to send a pre-charge relay disconnection command state; real-time detection of the hydrogen stack system (14) mode feedback signal basic mode is start-up, and whether the main relay state is closed; If both are yes, go to step S13; If not, go to step S14; S13, entering the vehicle controller VCU (6) to send a hydrogen stack operation enable command state, and the hydrogen stack is running; a. Real-time detection of whether there is an emergency shutdown request or a signal of excessive hydrogen concentration in the system; If any of the conditions is yes, go to step S15; If all are negative, maintain step S13; b. Real-time detection of whether the dedicated mode switch (4) signal is turned off, whether the SOC signal is >= 90%, whether the remaining hydrogen volume is <= 8%, whether the ignition switch (3) is in the OFF position, and whether there is a fuel cell system fault code; If any of the conditions is yes, go to step S14; If all are negative, maintain step S13; S14, entering the state where the vehicle controller VCU (6) issues a normal shutdown command for the hydrogen stack; S15, entering the state where the vehicle controller VCU (6) issues a hydrogen stack emergency shutdown command; S16, in the state of step S14 and step S15, real-time detection of whether the basic mode of the hydrogen stack system (14) mode feedback signal is standby or emergency shutdown, and whether the main relay state is disconnected; If yes, go to step S17; If not, maintain step S15 for a certain period of time and then go to S17; S17, entering the state where the vehicle controller VCU (6) issues a main positive relay disconnection command; S18, end.

2. The hydrogen fuel commercial vehicle electronic control system according to claim 1, characterized in that: The power battery (1) and the hydrogen stack high-voltage power distribution (12) as well as the pure electric high-voltage power distribution (9) and the five-in-one PDU controller (10) are all reversibly connected.

3. The electronic control system for hydrogen fuel commercial vehicles according to claim 1, characterized in that: In step S13, the vehicle controller VCU (6) sends a hydrogen stack operation enable command state, and the hydrogen stack is operated. The hydrogen stack operation process control specifically includes: S1301, enter the initial mode, the vehicle controller VCU (6) sends a target power command of 0; real-time detection of the basic mode of the associated signal hydrogen stack system (14) mode feedback signal is normal operation; If yes, go to step S1302; If not, maintain step S1301; S1302, entering the normal mode, the vehicle controller VCU (6) sends a command to set the target power to a fixed value; a, real-time detection of whether the basic mode of the mode feedback signal of the associated signal hydrogen stack system (14) is limited power operation; If yes, go to step S1303; If not, maintain step S1302; b. Real-time detection of whether the SOC signal of the associated signal is greater than or equal to 85%, whether the remaining hydrogen volume is less than or equal to 8%, whether there is a fault in the hydrogen stack system (14), and whether there is a fault in the hydrogen bottle group system (2); If any of the conditions is yes, go to step S1304; If not, maintain step S1302; S1303, enter the power limit mode, the vehicle controller VCU (6) sends a command that the target power is a coefficient of the limit; real-time detection of the associated signal SOC signal is greater than or equal to 85%, the remaining hydrogen volume is less than or equal to 8%, whether there is a fault in the hydrogen stack system (14), and whether there is a fault in the hydrogen bottle group system (2); If any of the conditions is yes, go to step S1304; S1304, enters fault mode, the vehicle controller VCU (6) sends a command to set the target power to 0, S1305, in the power limiting mode or the fault mode, go to S1306; S1306, end.

4. The electronic control system for hydrogen fuel commercial vehicles according to claim 1, characterized in that: During the operation of the hydrogen stack system (14), there is control of the electronically controlled accessories of the whole vehicle, and the electronically controlled accessories control method of the whole vehicle specifically includes: A1, initial mode, the vehicle controller VCU (6) sends the air pump (7) a working command to turn off; real-time detection of the associated signal whether the vehicle is in high pressure or Ready state, and whether any of the air pressure signals of the front and rear axle brake reservoirs is less than the minimum specified value; If both are yes, go to step A2 or A3; If no, maintain step A1; A2, enters start mode 0, the vehicle controller VCU (6) sends the air pump (7) a start command; A3, enters start mode 1, the vehicle controller VCU (6) sends the air pump (7) a working command to turn off; A4, enters the original mode 0, the vehicle controller VCU (6) sends the air pump (7) a working command to turn off or on; A5, enter delay mode 0, the vehicle controller VCU (6) sends the air pump (7) a start command; a. Real-time detection of the delay of the associated signal for the specified time, and whether the air pressure signals of the front and rear axle brake reservoirs are both less than 0.8 times the maximum specified value; If both are yes, go to step A4; If no, maintain step A5; b. Real-time detection of the air pressure signals of the brake reservoirs of the front and rear axles of the associated signals to see whether any of them is greater than 0.8 times the maximum specified value; If yes, go to step A6; If no, maintain step A5; A6, enter delay mode 1, the vehicle controller VCU (6) sends the air pump (7) a working command to turn off; real-time detection of the associated signal front and rear axle brake reservoir air pressure signal to see if any one is less than the minimum specified value; If yes, go to step A4; If no, continue with step A6; A7, in the state of step A6 and A4, real-time detection of the associated signal vehicle controller VCU (6) delaying power off and whether the ignition switch (3) is in the non-ON position; If both are yes, go to step A5; If no, maintain A6 and A4 status; A8, end.

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