Electrical control system of hydrogen energy mine car power system

Abstract

The invention relates to the technical field of special cars, and discloses an electrical control system of a hydrogen energy mine car power system, which comprises a fuel cell generator, a power cell control cabinet, an integrated power control cabinet and a VCU, the power battery control cabinet comprises a discharging anode contactor K1, a first pre-charging contactor K2, a first pre-charging resistor R1 and a discharging cathode contactor K3; the integrated power control cabinet comprises a positive contactor K7, a second pre-charging contactor K8, a second pre-charging resistor R2, a first power switch tube S1, a discharging resistor R3, a voltage reduction DC / DC controller and a Bi BUCK-BOOST DC / DC controller. According to the application, 400-750V to 400-1800V high-voltage platform coupling is realized, all hydrogen energy mine car platforms can be compatible, the universality is high, the shutdown automatic delay power-off requirement of the hydrogen fuel cell engine is met, the abnormal shutdown risk caused by misoperation of a driver is eliminated, and the service life of the hydrogen fuel cell engine is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of special vehicles, and specifically to an electrical control system of a hydrogen mining vehicle power system. Background Art

[0002] As one of the important application scenarios of hydrogen energy, mining trucks are an indispensable part of the development of the hydrogen energy industry. The development of hydrogen mining trucks is imperative. Since the technology of hydrogen mining trucks has just started and is not yet mature, a power system electrical architecture is needed to guide and improve the construction of the vehicle power system platform.

[0003] Domestic hydrogen mining trucks are just beginning to be developed. Currently, the high-voltage power platform of electric mining trucks is not unified, and the power system components are complicated, which faces the challenge of difficult power system platform construction. In addition, the inherent characteristics of hydrogen fuel cell engines lead to the need for delayed power-off during the shutdown process. In the past, the driver relied on manual judgment and operation, which was prone to mistakes, especially in low-temperature environments. Accidental termination of the shutdown process would permanently damage the battery stack. Therefore, it is necessary to introduce a universal power system electrical architecture to guide the construction of a hydrogen mining truck power system platform. Summary of the invention

[0004] The purpose of this application is to provide an electrical control system for a hydrogen mining car power system that realizes coupling of a high-voltage electrical platform from 400 to 750V to 400 to 1800V, is compatible with all hydrogen mining car platforms, has strong versatility, meets the demand for automatic delayed power-off of the hydrogen fuel cell engine, eliminates the risk of abnormal shutdown due to driver operating errors, and increases the life of the hydrogen fuel cell engine.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An electrical control system of a hydrogen mining car power system of the present invention comprises a fuel cell generator for providing electric energy for the whole vehicle, the fuel cell generator is connected to a power battery control cabinet for controlling the charging and discharging of the power battery and the power distribution, and is connected to an integrated power control cabinet for controlling the high-voltage components of the power system, the integrated power control cabinet is connected to a VCU for coordinated control and fault diagnosis of the whole vehicle power system, and the VCU is connected to the fuel cell generator and the power battery control cabinet respectively;

[0007] The power battery control cabinet includes a discharge positive contactor K1 for controlling the conduction and disconnection of the power battery discharge positive circuit, a first pre-charging contactor K2 and a first pre-charging resistor R1 for high-voltage power-on pre-charging of the power battery discharge circuit, the first pre-charging contactor K2 is connected in series with the first pre-charging resistor R1 and then connected in parallel with the discharge positive contactor K1, and a discharge negative contactor K3 for controlling the conduction and disconnection of the power battery discharge negative circuit;

[0008] The integrated power control cabinet includes a positive contactor K7 for controlling the conduction and disconnection of the positive input circuit, a second pre-charging contactor K8 and a second pre-charging resistor R2 for pre-charging the input circuit high voltage, the second pre-charging contactor K8 and the second pre-charging resistor R2 are connected in series and then connected in parallel with the discharge positive contactor K7, a first power switch tube S1 and a discharge resistor R3 for controlling the discharge of the residual voltage of the high-voltage bus, the first power switch tube S1 and the discharge resistor R3 are connected in series with a step-down DC / DC controller for low-voltage power supply to all components of the vehicle, and a Bi BUCK-BOOST DC / DC controller for coupling the high voltage level between the power battery and the drive motor, and the Bi BUCK-BOOST DC / DC controller is connected to the power battery control cabinet through the positive contactor K7.

[0009] Furthermore, the fuel cell engine is respectively connected to a stack cooling system for thermal management of the internal stack of the fuel cell engine and a fuel cell BOP cooling system for thermal management of the internal system components of the fuel cell engine, so as to ensure that the fuel cell engine operates within the optimal temperature range under various operating conditions.

[0010] Furthermore, the power battery control cabinet is connected to a power battery PACK for peak shaving and valley filling to stabilize power output, and a power battery TMS for thermal management of the power battery PACK. The power battery PACK is connected in parallel with the fuel cell engine through a discharge positive contactor K1 and a discharge negative contactor K3, respectively. The power battery TMS controls the conduction and disconnection of the power battery TMS positive input circuit through a power battery TMS positive contactor K6.

[0011] Furthermore, the power battery control cabinet also includes a manual isolating switch MSD for physically forcibly cutting off the electrical connection between the vehicle bus and the power battery, and an insulation monitor for online real-time monitoring of the insulation value of the high-voltage bus, wherein the insulation monitor is connected in parallel with the fuel cell engine.

[0012] Furthermore, the integrated power control cabinet also includes a drive motor controller, a hydraulic pump motor controller, a drive motor cooling fan controller and a high-pressure accessory cooling fan controller, which are respectively connected to the drive motor, the hydraulic pump motor, the drive motor cooling fan and the high-pressure accessory cooling fan. The drive motor controller is connected in parallel with the Bi BUCK-BOOST DC / DC controller, and the Bi BUCK-BOOST DC / DC controller is connected in parallel with a braking resistor.

[0013] Compared with the prior art, the beneficial effects of this application are:

[0014] In actual application, the power system startup process is as follows:

[0015] The vehicle key switch is turned to the ON position, the VCU detects the ON position signal, and the low-voltage wakeup executes the low-voltage self-test process; the VCU outputs the wakeup electrical signal to wake up the hydrogen storage system, the hydrogen fuel cell engine, the power battery control cabinet, and the integrated power control cabinet; the power battery control cabinet and the hydrogen fuel cell engine respectively supply low-voltage electricity to the peripheral electrical equipment, and all components of the power system work at low voltage, and the low-voltage power-on process is completed; the VCU sends a power battery discharge instruction to the power battery control cabinet; the power battery control cabinet respectively closes the discharge negative contactor K3 and the first pre-charge contactor K2, and the first pre-charge contactor K2 is connected in series with the first pre-charge resistor R1, which is used for high-voltage power-on pre-charging of the power battery discharge circuit to protect the discharge positive contactor K1 and prevent adhesion; after judging that the pre-charging is completed, the discharge positive contactor K1 is then closed and the first pre-charge contactor K2 is disconnected, and the power battery discharge circuit is connected. The VCU sends a step-down DC / DC enable command to the integrated power control cabinet, and the step-down DC / DC controller works to supply low-voltage electricity to the vehicle; the key switch is turned to the START position, the VCU detects the START position signal, and starts to execute the high-voltage power-on process: the integrated power control cabinet closes the second pre-charging contactor K8, and the second pre-charging contactor K8 is connected in series with the second pre-charging resistor R2 to pre-charge the input circuit high-voltage power-on to protect the input positive contactor K7 to prevent adhesion; after judging that the pre-charging is completed, the input positive contactor K7 is then closed and the second pre-charging contactor K8 is disconnected; the Bi BUCK-BOOST DC / DC controller works, the power battery voltage platform is 400~750V, and the drive motor voltage platform is 400V~1600V, through the Bi BUCK-BOOST The bidirectional DC voltage conversion of the DC / DC controller can achieve coupling between different high-voltage power platforms, and the power-on process of the high-voltage components of the entire power system is now complete; after the VCU receives the gear position signal and throttle signal of the vehicle, the drive motor works to respond to the driving power demand of the vehicle in real time; the hydrogen fuel cell engine runs and serves as the main power source of the vehicle. The VCU will coordinate the control and fault diagnosis of the power system in real time throughout the process to ensure reliable operation.

[0016] Power system shutdown and power-off process:

[0017] When the car key is turned to the OFF position and the VCU cannot receive the ON position signal, it sends a high-voltage power-off command; the integrated power control cabinet control system stops working; then the input positive contactor K7 is disconnected, and the hydrogen fuel cell engine executes the shutdown process. After determining that the hydrogen fuel cell shutdown is completed, the step-down DC / DC controller is controlled to stop working; the power battery control cabinet disconnects the discharge positive contactor K1 and the discharge negative contactor K3, and cuts off the high-voltage electrical connection with the power battery; then the first power switch tube S1 is controlled to work, and the discharge resistor R3 discharges the residual voltage. The first power switch tube S1 adopts PWM chopping control mode, and cooperates with the discharge resistor R3 to control the discharge of the residual voltage of the high-voltage bus after the high-voltage circuit is cut off to prevent electric shock. After the voltage is discharged to a safe voltage, the high-voltage power-off is completed. Then the VCU stops outputting the wake-up electrical signal, and then the entire power system components enter a low-voltage dormant state, and the power-off is completed, meeting the automatic delayed power-off requirements of the hydrogen fuel cell engine; the present application realizes the coupling of 400-750V to 400-1800V high-voltage electrical platforms, which is compatible with all hydrogen mining car platforms, has strong versatility, meets the automatic delayed power-off requirements of the hydrogen fuel cell engine, eliminates the risk of abnormal shutdown due to driver operating errors, and increases the life of the hydrogen fuel cell engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic diagram of the electrical structure of this application;

[0020] Figure 2 is a schematic diagram of the internal high voltage electrical structure of the present application;

[0021] Figure 3 It is a schematic diagram of the internal low-voltage electrical structure of this application. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show the layers related to the present invention rather than being drawn according to the number, shape and size of the layers in actual implementation. In actual implementation, the type, quantity and proportion of each layer may be changed arbitrarily, and the layer layout may also be more complicated.

[0024] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0025] See also Figures 1 to 3 , an electrical control system of a hydrogen mining car power system, comprising a fuel cell generator for providing electric energy for the whole vehicle, the fuel cell generator being connected to a power battery control cabinet for controlling the charging and discharging of the power battery and the power distribution and an integrated power control cabinet for controlling the high-voltage components of the power system, the integrated power control cabinet being connected to a VCU for coordinated control and fault diagnosis of the whole vehicle power system, the VCU being connected to the fuel cell generator and the power battery control cabinet respectively;

[0026] The power battery control cabinet includes a discharge positive contactor K1 for controlling the conduction and disconnection of the power battery discharge positive circuit, a first pre-charging contactor K2 and a first pre-charging resistor R1 for high-voltage power-on pre-charging of the power battery discharge circuit, the first pre-charging contactor K2 is connected in series with the first pre-charging resistor R1 and then connected in parallel with the discharge positive contactor K1, and a discharge negative contactor K3 for controlling the conduction and disconnection of the power battery discharge negative circuit;

[0027] The integrated power control cabinet includes a positive contactor K7 for controlling the conduction and disconnection of the positive input circuit, a second pre-charging contactor K8 and a second pre-charging resistor R2 for pre-charging the input circuit high voltage, the second pre-charging contactor K8 and the second pre-charging resistor R2 are connected in series and then connected in parallel with the discharge positive contactor K7, a first power switch tube S1 and a discharge resistor R3 for controlling the discharge of the residual voltage of the high-voltage bus, the first power switch tube S1 and the discharge resistor R3 are connected in series with a step-down DC / DC controller for low-voltage power supply to all components of the vehicle, and a Bi BUCK-BOOST DC / DC controller for coupling the high voltage level between the power battery and the drive motor, and the Bi BUCK-BOOST DC / DC controller is connected to the power battery control cabinet through the positive contactor K7.

[0028] This application realizes the coupling of 400~750V to 400~1800V high-voltage power platforms, is compatible with all hydrogen mining car platforms, has strong versatility, meets the needs of automatic delayed power-off of hydrogen fuel cell engines, eliminates the risk of abnormal shutdown due to driver operating errors, and increases the life of hydrogen fuel cell engines.

[0029] The fuel cell engine is respectively connected to a stack cooling system for thermal management of the internal stack of the fuel cell engine and a fuel cell BOP cooling system for thermal management of the internal system components of the fuel cell engine, so as to ensure that the fuel cell engine operates within the optimal temperature range under various working conditions.

[0030] The power battery control cabinet is connected to a power battery PACK for peak shaving and valley filling to stabilize power output, and a power battery TMS for thermal management of the power battery PACK. The power battery PACK is connected in parallel with the fuel cell engine through a discharge positive contactor K1 and a discharge negative contactor K3, respectively. The power battery TMS controls the conduction and disconnection of the power battery TMS positive input circuit through a power battery TMS positive contactor K6.

[0031] The power battery control cabinet also includes a manual isolating switch MSD for physically forcibly cutting off the electrical connection between the vehicle bus and the power battery, and an insulation monitor for online real-time monitoring of the insulation value of the high-voltage bus, wherein the insulation monitor is connected in parallel with the fuel cell engine.

[0032] The integrated power control cabinet also includes a drive motor controller, a hydraulic pump motor controller, a drive motor cooling fan controller and a high-voltage accessory cooling fan controller, which are respectively connected to the drive motor, the hydraulic pump motor, the drive motor cooling fan and the high-voltage accessory cooling fan. The drive motor controller is connected in parallel with the Bi BUCK-BOOST DC / DC controller, and the Bi BUCK-BOOST DC / DC controller is connected in parallel with a brake resistor.

[0033] An electrical control system for a hydrogen mining car power system, comprising a hydrogen fuel cell engine, a stack cooling system, a fuel cell BOP cooling system, a power battery PACK, a power battery control cabinet, a power battery TMS, a charging stand, an integrated power control cabinet, a drive motor, a hydraulic pump motor, a drive motor cooling fan, a high-voltage accessory cooling fan, a brake resistor, a weak current control cabinet, a hydrogen storage system, a 24V battery, and a VCU.

[0034] The hydrogen fuel cell engine is a device that generates electricity and heat energy by chemically reacting the hydrogen provided by the hydrogen storage system with the oxygen provided by the air. It is mainly used to provide electricity for the vehicle power system. The hydrogen fuel cell engine is electrically connected to the stack cooling system, the fuel cell BOP cooling system, the power battery control cabinet, the weak current control cabinet, and the VCU. Multiple hydrogen fuel cell engines can be connected in parallel.

[0035] The stack cooling system is mainly used for thermal management of the stack inside the hydrogen fuel cell engine to ensure that the stack operates within the optimal temperature range under various operating conditions.

[0036] The fuel cell BOP cooling system is mainly used for the cooling management of BOPs such as DC / DC converters, air compressors and controllers, hydrogen circulation pumps and controllers inside hydrogen fuel cell engines.

[0037] The power battery PACK is connected in parallel with the hydrogen fuel cell engine to provide electrical energy before the hydrogen fuel cell engine runs. It also plays the role of shaving peaks and filling valleys to stabilize power output and recover braking energy. The power battery PACK is electrically connected to the power battery control cabinet. Multiple power battery PACKs can be connected in parallel.

[0038] The charging seat is mainly used for power transmission between the power battery PCAK and the charging pile to charge the power battery. The charging seat is electrically connected to the power battery control cabinet.

[0039] The power battery TMS is mainly used for thermal management of the power battery PACK to ensure that the battery cells operate within a suitable temperature range. The power battery TMS is electrically connected to the power battery control cabinet.

[0040] Power battery control cabinet, such as Figure 2As shown, it is mainly composed of a manual isolating switch MSD, a discharge positive contactor K1, a first pre-charge contactor K2, a first pre-charge resistor R1, a discharge negative contactor K3, a charge positive contactor K4, a charge negative contactor K5, a hydrogen fuel cell engine positive fuse F1, a power battery TMS positive fuse F2, a power battery TMS positive contactor K6, and an insulation monitor. Among them, the function of MSD is to physically and forcibly cut off the electrical connection between the vehicle bus and the power battery by disconnecting MSD during the installation, inspection and maintenance of the vehicle's high-voltage components to prevent accidental electric shock; the discharge positive contactor K1 is used to control the conduction and disconnection of the power battery discharge positive circuit; the first pre-charge contactor K2 and the first pre-charge resistor R1 are used for high-voltage power-on pre-charging of the power battery discharge circuit to protect the discharge positive contactor K1 and prevent adhesion; K3 is used to control the conduction and disconnection of the power battery discharge negative circuit; the charge positive contactor K4 is used to control the power battery charge The positive pole contactor K5 is used to control the conduction and disconnection of the positive pole circuit of the power battery; the positive pole fuse F1 of the hydrogen fuel cell engine is used for overload and short circuit protection of the high voltage output circuit of the hydrogen fuel cell engine; the positive pole fuse F2 of the power battery TMS is used for overload and short circuit protection of the high voltage input circuit of the power battery TMS; the positive pole contactor K6 of the power battery TMS is used to control the conduction and disconnection of the positive pole input circuit of the power battery TMS; the insulation monitor is used for online real-time monitoring of the insulation value of the high voltage bus and leakage protection. The main functions of the power battery control cabinet are to control the charging and discharging of the power battery, power distribution and overload and short circuit protection, and online insulation value monitoring. The power battery control cabinet is electrically connected to the integrated power control cabinet, weak current control cabinet, and VCU.

[0041] Integrated power control cabinet, such as Figure 2It is mainly composed of a positive contactor K7, a second pre-charge contactor K8, a second pre-charge resistor R2, a first power switch tube S1, a discharge resistor R3, a second power switch tube S2, fuses F3~F7, a Bi BUCK-BOOSTDC / DC controller, a drive motor controller, a hydraulic pump motor controller, a drive motor cooling fan controller, a high-voltage accessory cooling fan controller, and a step-down DC / DC controller. Among them, the positive contactor K7 is used to control the conduction and disconnection of the positive input circuit; the second pre-charge contactor K8 and the second pre-charge resistor R2 are used for pre-charging the input circuit high voltage, protecting the positive contactor K7 and preventing adhesion; the first power switch tube S1 adopts PWM chopping control mode, and cooperates with the discharge resistor R3, which is mainly used to control the discharge of the residual voltage of the high-voltage bus after the high-voltage circuit is cut off to prevent electric shock; the second power switch tube S2 adopts PWM chopping control mode, which is mainly used for the start and stop and power consumption control of the braking resistor; fuses F3~F7 are respectively used for overload and short-circuit protection of BiBUCK-BOOST DC / DC controller, hydraulic pump motor controller, drive motor cooling fan controller, high-voltage accessory cooling fan controller, and step-down DC / DC controller; the power battery voltage platform is 400~750V, and the drive motor voltage platform is 400V~1600V. Through Bi BUCK-BOOST The bidirectional DC voltage conversion of the DC / DC controller can realize the coupling between different high-voltage electrical platforms; the drive motor controller is used for the start and stop, speed and torque control of the drive motor, motor braking energy feedback and fault diagnosis. The hydraulic pump motor controller is used for the start and stop, speed and torque control and fault diagnosis of the hydraulic pump motor; the drive motor cooling fan controller is used for the start and stop, speed control and fault diagnosis of the drive motor cooling fan; the high-voltage accessory cooling fan controller is used for the start and stop, speed control and fault diagnosis of the high-voltage accessory cooling fan; the step-down DC / DC controller is used for low-voltage power supply to all components of the vehicle and charging the 24V battery; the main functions of the integrated power control cabinet are the control, fault diagnosis, power distribution, overload and short-circuit protection of the high-voltage components of the power system. The integrated power control cabinet is electrically connected to the drive motor, hydraulic pump motor, brake resistor, drive motor cooling fan, high-voltage accessory cooling fan, weak current control cabinet, and VCU.

[0042] The main function of the drive motor is to convert electrical energy into mechanical energy, provide power for the vehicle, drive the wheels to move, and enable the vehicle to move.

[0043] The hydraulic pump motor is connected to the vehicle's hydraulic system and is used for vehicle steering control and cargo box lifting operations.

[0044] The drive motor cooling fan is mainly used to cool the drive motor.

[0045] The high-pressure accessory cooling fan is connected to the integrated power cabinet, hydraulic pump motor, and brake resistor through the air duct for cooling.

[0046] Braking resistors are mainly used to participate in the braking feedback process of the drive motor and discharge the energy that the power battery cannot absorb;

[0047] The weak current control cabinet is electrically connected to the 24V battery, hydrogen storage system, and VCU. Figure 3 As shown, fuses f1 to f4 are integrated inside the weak current control cabinet. Among them, fuses f1 to f4 are respectively used for overload and short circuit protection of low-voltage power supply of hydrogen storage system, hydrogen fuel cell engine, power battery control cabinet, and integrated power control cabinet low-voltage power supply; 24V battery is connected in series with the low-voltage power supply main switch, and then connected in parallel with the weak current control cabinet. When the low-voltage power supply main switch is closed, 24V+ is normally connected. The weak current control cabinet is mainly used for low-voltage power distribution, overload and short circuit protection of the whole vehicle, and control of body accessories.

[0048] The hydrogen storage system is mainly used for hydrogen filling and storage, and supplies the hydrogen fuel cell engine after reducing the hydrogen pressure.

[0049] The 24V battery is connected in parallel with the step-down DC / DC controller and is mainly used to power the low-voltage electrical system of the vehicle.

[0050] VCU, as the core controller of the vehicle, is used for coordinated control and fault diagnosis of the entire power system.

[0051] This patent is also applicable to solutions with multiple hydrogen fuel cell engines or power batteries connected in parallel.

[0052] First, the power system startup process:

[0053] First, close the main low-voltage power switch, connect 24V+ to the normal power, and put the power system components in a dormant state; then, turn the vehicle key switch to the ON position, the VCU detects the ON signal, and the low-voltage wakeup executes the low-voltage self-test process; then the VCU outputs a wakeup electrical signal to wake up the hydrogen storage system, the hydrogen fuel cell engine, the power battery control cabinet, and the integrated power control cabinet; then the power battery control cabinet supplies low-voltage electricity to the power battery TMS, and the hydrogen fuel cell engine supplies low-voltage electricity to the stack cooling system and the fuel cell BOP cooling system. All components of the power system work at low voltage, and the low The power-on process is completed; then the VCU sends a power battery discharge instruction to the power battery control cabinet; then the power battery control cabinet closes the discharge negative contactor K3, and then closes the pre-charge contactor K2. After judging that the pre-charge is completed, the discharge positive contactor K1 is closed, and then the pre-charge contactor K2 is disconnected, and the power battery discharge circuit is connected; then the insulation monitor works to monitor the insulation value of the high-voltage bus in real time; then the power battery TMS positive contactor K6 is closed, and the power battery TMS determines whether to shut down or work according to the real-time temperature of the power battery to ensure that the battery cell temperature is within the optimal range. Then the VCU sends a step-down DC / DC enable command to the integrated power control cabinet, and the step-down DC / DC controller works to supply low-voltage electricity to the vehicle; then the key switch is turned to the START gear, and the VCU detects the START gear signal and starts the high-voltage power-on process; then the integrated power control cabinet closes the pre-charge contactor K8, and after judging that the pre-charge is completed, it then closes the input positive contactor K7, and then disconnects the pre-charge contactor K8; then the Bi BUCK-BOOST DC / DC controller works, and the power-on process of the high-voltage components of the entire power system is completed; then after the VCU receives the vehicle gear position signal and throttle signal, the drive motor works to respond to the vehicle's driving power requirements in real time; at the same time, the drive motor cooling fan will work according to the real-time temperature of the drive motor to control the drive motor temperature within the target range; then the hydrogen fuel cell engine runs and serves as the main power source of the vehicle. When the vehicle brakes, the VCU will control the brake resistor to work according to the chargeable current value of the power battery to achieve the optimal energy recovery gain. When the VCU receives a steering signal or a lifting signal, it controls the hydraulic pump motor to work. VCU will coordinate control and fault diagnosis of the power system in real time throughout the process to ensure reliable operation.

[0054] Second, the power system shutdown and power-off process:

[0055] When the car key is turned to the OFF position and the VCU does not receive the ON position signal, it sends a high-voltage power-off command; then the integrated power control cabinet controls the drive motor, hydraulic pump motor, drive motor cooling fan, high-voltage accessory cooling fan, and brake resistor controller to stop working; then disconnect the input positive contactor K7; at the same time, the hydrogen fuel cell engine executes the shutdown process; then after judging that the hydrogen fuel cell shutdown is completed, control the step-down DC / DC controller to stop working; then the power battery control cabinet disconnects the discharge positive contactor K1, then disconnects the discharge negative contactor K3, and cuts off the high-voltage electrical connection with the power battery; then controls the power switch tube S1 to work, and the discharge resistor R3 discharges the residual voltage. After the voltage is discharged to a safe voltage, the high-voltage power-off is completed. Then the VCU stops outputting the wake-up electrical signal, and then the entire power system components enter a low-voltage dormant state, and the power-off is completed.

[0056] In the above-mentioned embodiments, although the present invention has been described in conjunction with the specific embodiments of the present invention, many replacements, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such replacements, modifications and variations falling within the broad scope of the appended claims.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An electrical control system for a hydrogen mining car power system, characterized in that: It includes a fuel cell generator for providing electric energy for the whole vehicle, the fuel cell generator is connected to a power battery control cabinet for controlling the charging and discharging of the power battery and the power distribution, and an integrated power control cabinet for controlling the high-voltage components of the power system, the integrated power control cabinet is connected to a VCU for coordinated control and fault diagnosis of the power system of the whole vehicle, and the VCU is connected to the fuel cell generator and the power battery control cabinet respectively; The power battery control cabinet includes a discharge positive contactor K1 for controlling the conduction and disconnection of the power battery discharge positive circuit, a first pre-charging contactor K2 and a first pre-charging resistor R1 for high-voltage power-on pre-charging of the power battery discharge circuit, the first pre-charging contactor K2 is connected in series with the first pre-charging resistor R1 and then connected in parallel with the discharge positive contactor K1, and a discharge negative contactor K3 for controlling the conduction and disconnection of the power battery discharge negative circuit; The integrated power control cabinet includes a positive contactor K7 for controlling the conduction and disconnection of the positive input circuit, a second pre-charging contactor K8 and a second pre-charging resistor R2 for pre-charging the input circuit high voltage, the second pre-charging contactor K8 and the second pre-charging resistor R2 are connected in series and then connected in parallel with the discharge positive contactor K7, a first power switch tube S1 and a discharge resistor R3 for controlling the discharge of the residual voltage of the high-voltage bus, the first power switch tube S1 and the discharge resistor R3 are connected in series and then connected to a step-down DC / DC controller for low-voltage power supply to all components of the vehicle, and a BiBUCK-BOOST DC / DC controller for coupling the high-voltage level between the power battery and the drive motor, and the Bi BUCK-BOOST DC / DC controller is connected to the power battery control cabinet through the positive contactor K7.

2. The electrical control system of a hydrogen mining car power system according to claim 1, characterized in that: The fuel cell engine is respectively connected to a stack cooling system for heat management of the internal stack of the fuel cell engine and a fuel cell BOP cooling system for heat management of internal system components of the fuel cell engine.

3. The electrical control system of a hydrogen mining car power system according to claim 1 is characterized in that: The power battery control cabinet is connected to a power battery PACK for peak shaving and valley filling to stabilize power output, and a power battery TMS for thermal management of the power battery PACK. The power battery PACK is connected in parallel with the fuel cell engine through a discharge positive contactor K1 and a discharge negative contactor K3, respectively. The power battery TMS controls the conduction and disconnection of the power battery TMS positive input circuit through a power battery TMS positive contactor K6.

4. The electrical control system of a hydrogen mining car power system according to claim 1, characterized in that: The power battery control cabinet also includes a manual isolating switch MSD for physically forcibly cutting off the electrical connection between the vehicle bus and the power battery, and an insulation monitor for online real-time monitoring of the insulation value of the high-voltage bus, wherein the insulation monitor is connected in parallel with the fuel cell engine.

5. The electrical control system of a hydrogen mining car power system according to claim 1, characterized in that: The integrated power control cabinet also includes a drive motor controller, a hydraulic pump motor controller, a drive motor cooling fan controller and a high-voltage accessory cooling fan controller, which are respectively connected to the drive motor, the hydraulic pump motor, the drive motor cooling fan and the high-voltage accessory cooling fan. The drive motor controller is connected in parallel with the Bi BUCK-BOOST DC / DC controller, and the Bi BUCK-BOOST DC / DC controller is connected in parallel with a brake resistor.

Images