Control method for hydrogen fuel cell engine of coal mine transport vehicle

Abstract

The invention relates to the technical field of coal mine transport vehicles, and discloses a coal mine transport vehicle hydrogen fuel cell engine control method, which comprises the following steps: S1, starting and self-checking a coal mine transport vehicle system; s2, pre-charging the high-voltage system; s3, engine starting and operation control; s4, power grading adjustment; according to the method, before a high-pressure system is started, through methane and hydrogen concentration detection, environment safety is ensured, and the situation that a vehicle is started under the condition that the hazardous gas concentration is too high is avoided, so that the safety of a driver and the vehicle is ensured, and the running states of a hydrogen fuel cell engine, a lithium ion storage battery power source and a driving motor are monitored in real time; and corresponding measures are taken when serious faults are detected, so that fault expansion is effectively prevented, the safety performance of the whole vehicle, the SOC state of the lithium ion storage battery and the power requirement of the driving motor are protected, the output power of the hydrogen fuel cell engine is dynamically adjusted, and it is ensured that the engine works in the optimal efficiency interval.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine transport vehicles, and in particular to a method for controlling a hydrogen fuel cell engine of a coal mine transport vehicle. Background Art

[0002] Coal mines are areas where humans mine coal resources in coal-rich mining areas. They are generally divided into underground coal mines and open-pit coal mines. When the coal seam is far from the surface, it is generally chosen to dig tunnels underground to mine coal. This is an underground coal mine. When the coal seam is very close to the surface, it is generally chosen to directly strip the surface soil layer to mine coal. This is an open-pit coal mine. Article 135 of the Coal Mine Safety Regulations requires that the maximum allowable concentration of carbon dioxide and harmful gases (CO, NO2, H2S, SO2, etc.) in the air of coal mines be stipulated, and that the ventilation conditions in coal mines are limited, and the air quality underground is relatively poor, so as to achieve energy conservation and emission reduction and improve the air quality underground.

[0003] Existing rubber-wheeled vehicles without hydrogen fuel cell engines are in use underground in coal mines. The application of hydrogen fuel cell engines in road vehicles is becoming more mature and the demonstration scale is gradually increasing, such as heavy trucks, light trucks, buses and passenger cars. However, the working response time of hydrogen fuel cell engines is slower than that of electric vehicles and fuel vehicles. The power increase and decrease methods of hydrogen fuel cell engines are not matched, which will lead to high energy consumption of hydrogen fuel cell engines. Therefore, a control method for hydrogen fuel cell engines of coal mine transport vehicles is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a method for controlling a hydrogen fuel cell engine of a coal mine transport vehicle to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for controlling a hydrogen fuel cell engine of a coal mine transport vehicle, comprising the following steps:

[0006] S1. Start-up and self-check of coal mine transport vehicle system;

[0007] S2, high-voltage system pre-charge;

[0008] S3, engine start and operation control;

[0009] S4, power graded regulation;

[0010] S5. Troubleshooting.

[0011] Preferably, in S1, when the emergency stop switch is in the released state, the key switch is turned to the ACC position, and the methane sensor detects that the concentration is lower than 1% and there is no alarm, the on-board VCU is powered on and awakened, and connected with the BMS and PDU through CAN communication;

[0012] After the VCU detects that the BMS has no serious faults, it sends a high-voltage power-on command to the BMS. After the high-voltage power-on is completed, the DC / DC buck module inside the PDU starts working to provide low-voltage power for the entire vehicle and wake up the electrical equipment;

[0013] VCU collects data from related electrical equipment. After VCU detects that there is no serious fault in related electrical equipment, the key switch is turned to the ON position, and VCU sends a high-voltage command to the PDU. The PDU automatically pre-charges the high-voltage output terminal, and the motor controller and oil pump motor are automatically pre-charged with high voltage to complete the power-on.

[0014] Preferably, the voltage of the low voltage electricity is DC24V.

[0015] Preferably, in S2, the driver selects the vehicle operating mode through the FCEV mode switch;

[0016] When released in EV mode, the vehicle is in pure electric mode; when the switch is pressed to switch to FCEV mode, the system starts preparing the hydrogen fuel cell engine to work;

[0017] If the measured hydrogen concentration is lower than the set value, the boost module of the fuel cell system will automatically pre-charge and power up to ensure the high-voltage power supply of the engine auxiliary system;

[0018] If the hydrogen concentration is higher than the set value, the power will not be turned on.

[0019] Preferably, in S3, when the mode switch is in FCEV mode and the key switch is turned to the start position or the start position, the VCU issues a hydrogen fuel cell engine stack start command and a drive motor preparation command;

[0020] The VCU adjusts the engine's operating state and output power based on the current temperature of the lithium-ion battery power source, ensuring that a lower voltage is requested when the battery temperature is below 1°C, and a higher voltage is requested when the battery temperature is 1°C or above;

[0021] The power loading of hydrogen fuel cell engines gradually increases from low to high.

[0022] Preferably, the voltage of the above-mentioned high voltage electricity is DC585V.

[0023] Preferably, in S4, the output power of the hydrogen fuel cell engine is dynamically adjusted according to the SOC state of the lithium-ion battery.

[0024] Preferably, the SOC is lower than 70%, the first gear power is requested to be 15kW, and the engine is operated until the SOC is ≥ 75%, the requested power is 0kW, and the hydrogen fuel cell engine is in standby mode;

[0025] When SOC≤60%, the second gear power is 30kW, and when SOC≥65%, the first gear power is 15kw;

[0026] When SOC≤50% and the drive motor power≥35kw, the third gear power is 50kw. When SOC≥55% and the motor power≤30kw, the second gear power is 30kw.

[0027] When SOC≤40% and the driving motor power≥35kw, the fourth gear power is required to be 70kw. When SOC≥45% and the motor power≤30kw, the third gear power is required to be 50kw.

[0028] Preferably, in S5, when the FCEV mode is in operation, the FCU monitors the operating status of the hydrogen fuel cell engine system. When the system failure reaches the highest level, the FCU issues a shutdown command, and the VCU automatically switches to the EV mode without affecting the normal driving of the vehicle.

[0029] The VCU monitors the operating status of the lithium-ion battery power supply and drive motor in real time. When the failure of the lithium-ion battery power supply and drive motor system reaches the highest level, the whole vehicle will stop at high voltage.

[0030] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0031] 1. Ensure environmental safety by detecting methane and hydrogen concentrations before starting the high-voltage system, avoid starting the vehicle when the concentration of dangerous gases is too high, thereby ensuring the safety of the driver and the vehicle, and monitor the operating status of the hydrogen fuel cell engine, lithium-ion battery power supply and drive motor in real time. When a serious fault is detected, take corresponding measures, such as switching to EV mode or parking the vehicle under high voltage, effectively preventing the fault from expanding and protecting the safety performance of the vehicle.

[0032] 2. Dynamically adjust the output power of the hydrogen fuel cell engine through the SOC state of the lithium-ion battery and the power demand of the drive motor to ensure that the engine operates in the optimal efficiency range and improve energy utilization efficiency. The output power response of the hydrogen fuel cell engine is fast and can meet the acceleration and climbing power requirements of the drive motor, thereby improving the vehicle's power performance and operating efficiency.

[0033] 3. Through a sophisticated power grading adjustment strategy, low voltage is powered on first and then high voltage. High voltage is powered on after the methane and hydrogen concentration detection is completed, which reduces unnecessary energy waste, lowers hydrogen energy consumption standards, and improves the economy of the entire vehicle. The hydrogen fuel cell engine directly converts the chemical energy of hydrogen into electrical energy, and has a higher energy conversion efficiency than traditional internal combustion engines.

[0034] 4. As an energy source, the refueling time of hydrogen is much shorter than the charging time of conventional lithium-ion batteries. It can be fully refueled in a few minutes, which greatly improves the efficiency and convenience of vehicle use. It provides two working modes, EV and FCEV. The driver can choose the most suitable operating mode according to actual needs to improve the driving experience. The hydrogen fuel cell engine only produces water during operation, achieving zero emissions, is environmentally friendly, and is in line with the development trend of green energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0039] Example

[0040] See also Figure 1 The present invention provides a technical solution: a method for controlling a hydrogen fuel cell engine of a coal mine transport vehicle, comprising the following steps:

[0041] S1. Start-up and self-check of coal mine transport vehicle system;

[0042] When the emergency stop switch is in the released state, the key switch is turned to the ACC position, and the methane sensor detects that the concentration is lower than 1% and there is no alarm, the on-board VCU is powered on and awakened, and connected with the BMS and PDU through CAN communication;

[0043] After the VCU detects that the BMS has no serious faults, it sends a high-voltage power-on command to the BMS. After the high-voltage power-on is completed, the DC / DC buck module inside the PDU starts to work, providing low-voltage power for the entire vehicle and waking up the electrical equipment; the voltage of the low-voltage power is DC24V

[0044] VCU collects data from related electrical equipment. After VCU detects that there is no serious fault in related electrical equipment, the key switch is turned to the ON position, and VCU sends a high-voltage command to the PDU. The PDU automatically pre-charges the high-voltage output terminal, and the motor controller and oil pump motor are automatically pre-charged with high voltage to complete the power-on.

[0045] S2, high-voltage system pre-charge;

[0046] The driver selects the vehicle operating mode through the FCEV mode switch;

[0047] When released in EV mode, the vehicle is in pure electric mode; when the switch is pressed to switch to FCEV mode, the system starts preparing the hydrogen fuel cell engine to work;

[0048] If the measured hydrogen concentration is lower than the set value, the boost module of the fuel cell system will automatically pre-charge and power up to ensure the high-voltage power supply of the engine auxiliary system;

[0049] If the hydrogen concentration is higher than the set value, the power will not be turned on.

[0050] S3, engine start and operation control;

[0051] When the mode switch is in FCEV mode and the key switch is turned to the start position or start position, the VCU issues a hydrogen fuel cell engine stack start command and a drive motor preparation command;

[0052] The VCU adjusts the engine's operating state and output power according to the current temperature of the lithium-ion battery power source, ensuring that a lower voltage is requested when the battery temperature is below 1°C, and a high voltage is requested when the battery temperature is 1°C or above; the voltage of the high voltage is DC585V

[0053] The power loading of hydrogen fuel cell engines gradually increases from low to high.

[0054] S4, power graded regulation;

[0055] The output power of the hydrogen fuel cell engine is dynamically adjusted according to the SOC state of the lithium-ion battery.

[0056] When SOC is lower than 70%, the first gear power is 15kW, and when SOC is ≥ 75%, the power request is 0kW, and the hydrogen fuel cell engine is in standby mode;

[0057] When SOC≤60%, the second gear power is 30kW, and when SOC≥65%, the first gear power is 15kw;

[0058] When SOC≤50% and the drive motor power≥35kw, the third gear power is 50kw. When SOC≥55% and the motor power≤30kw, the second gear power is 30kw.

[0059] When SOC≤40% and the driving motor power≥35kw, the fourth gear power is required to be 70kw. When SOC≥45% and the motor power≤30kw, the third gear power is required to be 50kw.

[0060] S5. Troubleshooting.

[0061] In FCEV mode, the FCU monitors the operating status of the hydrogen fuel cell engine system. When the system failure reaches the highest level, the FCU issues a shutdown command and the VCU automatically switches to EV mode without affecting the normal driving of the vehicle.

[0062] The VCU monitors the operating status of the lithium-ion battery power supply and drive motor in real time. When the failure of the lithium-ion battery power supply and drive motor system reaches the highest level, the whole vehicle will stop at high voltage.

[0063] The power of the hydrogen fuel cell stack is controlled in 4 gears:

[0064] 0 gear = 0kw, 1 gear = 15kw, 2 gear = 30kw, 3 gear = 50kw, 4 gear = 70kw;

[0065] The battery power temperature is less than 1°C, SOC is less than or equal to 70%, the requested voltage is the current total voltage of the battery, and the first gear power is 15kw;

[0066] Battery power supply battery temperature ≥ 1℃, the requested voltage is 585V;

[0067] The battery power temperature relationship data is as follows:

[0068]

[0069]

[0070] The conditional relationship of the above data is an and relationship, which must be satisfied at the same time.

[0071] In summary, before starting the high-voltage system, the methane and hydrogen concentrations are detected to ensure environmental safety and avoid starting the vehicle when the concentration of dangerous gases is too high, thereby ensuring the safety of the driver and the vehicle. The operating status of the hydrogen fuel cell engine, lithium-ion battery power supply and drive motor is monitored in real time, and corresponding measures are taken when a serious fault is detected, such as switching to EV mode or high-voltage electric parking of the whole vehicle, to effectively prevent the expansion of the fault and protect the safety performance of the whole vehicle.

[0072] According to the SOC state of the lithium-ion battery and the power demand of the drive motor, the output power of the hydrogen fuel cell engine is dynamically adjusted to ensure that the engine operates in the optimal efficiency range and improve energy utilization efficiency. The output power response of the hydrogen fuel cell engine is fast and can meet the acceleration and climbing power requirements of the drive motor, thereby improving the power performance and operating efficiency of the vehicle;

[0073] Through a sophisticated power grading adjustment strategy, low voltage is powered on first and then high voltage. High voltage is powered on after the methane and hydrogen concentrations are detected, which reduces unnecessary energy waste, lowers hydrogen energy consumption standards, and improves the economy of the vehicle. Hydrogen fuel cell engines directly convert the chemical energy of hydrogen into electrical energy, and have higher energy conversion efficiency than traditional internal combustion engines.

[0074] As an energy source, the refueling time of hydrogen is much shorter than the charging time of conventional lithium-ion batteries. It can be fully refueled within a few minutes, which greatly improves the efficiency and convenience of vehicle use. It provides two working modes, EV and FCEV. The driver can choose the most suitable operating mode according to actual needs to improve the driving experience. The hydrogen fuel cell engine only produces water during operation, achieving zero emissions, is environmentally friendly, and is in line with the development trend of green energy.

[0075] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. A method for controlling a hydrogen fuel cell engine for a coal mine transport vehicle, characterized in that: The following steps are involved: S1. Start-up and self-check of coal mine transport vehicle system; S2, high-voltage system pre-charge; S3, engine start and operation control; S4, power graded regulation; S5. Troubleshooting.

2. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 1, characterized in that: In S1, when the emergency stop switch is in the released state, the key switch is turned to the ACC position, and the methane sensor detects that the concentration is lower than 1% and there is no alarm, the on-board VCU is powered on and awakened, and connected with the BMS and PDU through CAN communication; After the VCU detects that the BMS has no serious faults, it sends a high-voltage power-on command to the BMS. After the high-voltage power-on is completed, the DC / DC buck module inside the PDU starts working to provide low-voltage power for the entire vehicle and wake up the electrical equipment; VCU collects data from related electrical equipment. After VCU detects that there is no serious fault in related electrical equipment, the key switch is turned to the ON position, and VCU sends a high-voltage command to the PDU. The PDU automatically pre-charges the high-voltage output terminal, and the motor controller and oil pump motor are automatically pre-charged with high voltage to complete the power-on.

3. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 2, characterized in that: The voltage of the low voltage electricity is DC24V.

4. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 3, characterized in that: In S2, the driver selects the vehicle operating mode through the FCEV mode switch; When released in EV mode, the vehicle is in pure electric mode; when the switch is pressed to switch to FCEV mode, the system starts preparing the hydrogen fuel cell engine to work; If the measured hydrogen concentration is lower than the set value, the boost module of the fuel cell system will automatically pre-charge and power up to ensure the high-voltage power supply of the engine auxiliary system; If the hydrogen concentration is higher than the set value, the power will not be turned on.

5. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 4, characterized in that: In S3, when the mode switch is in FCEV mode and the key switch is turned to the start position or the start position, the VCU issues a hydrogen fuel cell engine stack start command and a drive motor preparation command; The VCU adjusts the engine's operating state and output power based on the current temperature of the lithium-ion battery power source, ensuring that a lower voltage is requested when the battery temperature is below 1°C, and a higher voltage is requested when the battery temperature is 1°C or above; The power loading of hydrogen fuel cell engines gradually increases from low to high.

6. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 5, characterized in that: The voltage of the high voltage is DC585V.

7. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 6, characterized in that: In S4, the output power of the hydrogen fuel cell engine is dynamically adjusted according to the SOC state of the lithium-ion battery.

8. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 7, characterized in that: When the SOC is lower than 70%, the first gear power is requested to be 15 kW, and when the SOC is ≥ 75%, the requested power is 0 kW, and the hydrogen fuel cell engine is in standby mode; When SOC≤60%, the second gear power is 30kW, and when SOC≥65%, the first gear power is 15kw; When SOC≤50% and the drive motor power≥35kw, the third gear power is 50kw. When SOC≥55% and the motor power≤30kw, the second gear power is 30kw. When SOC≤40% and the driving motor power≥35kw, the fourth gear power is required to be 70kw. When the SOC≥45% and the motor power≤30kw, the third gear power is required to be 50kw.

9. A coal mine transport vehicle hydrogen fuel cell engine control method according to claim 8, characterized in that: In S5, when operating in FCEV mode, the FCU monitors the operating status of the hydrogen fuel cell engine system. When the system failure reaches the highest level, the FCU issues a shutdown command and the VCU automatically switches to EV mode without affecting the normal driving of the vehicle. The VCU monitors the operating status of the lithium-ion battery power supply and drive motor in real time. When the failure of the lithium-ion battery power supply and drive motor system reaches the highest level, the whole vehicle will stop at high voltage.

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