Double pre-charging circuit for hydrogen energy vehicle and method for pre-charging and high-voltage power-down thereof

Abstract

The present invention discloses a dual pre-charging circuit for a hydrogen energy vehicle and a method for pre-charging and high-voltage power-off thereof. The motor controller of the present invention is electrically connected to the whole vehicle drive motor, and the fuel-electric air compressor controller is electrically connected to the air compressor motor; the high-voltage auxiliary power supply, the first pre-charging circuit and the motor controller are connected in series to form a closed circuit, the fuel-electric boost FCDC is connected in parallel at both ends of the high-voltage auxiliary power supply, and the voltage reduction DCL is connected in parallel at both ends of the motor controller; the second pre-charging circuit, the fuel-electric air compressor controller and the high-voltage components are connected in series in sequence to form a branch, and the branch is connected in parallel at both ends of the high-voltage auxiliary power supply. In the present invention, the whole vehicle drive motor and the fuel-electric air compressor are pre-charged separately during the high-voltage power-on process of the hydrogen energy vehicle. During the high-voltage power-off process of the hydrogen energy vehicle, the whole vehicle drive motor can be powered off at high voltage first without waiting for the purge process of the fuel cell system, thereby improving the safety of powering off the whole vehicle drive motor.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen energy vehicles, and in particular to a dual pre-charging circuit of a hydrogen energy vehicle and a pre-charging and high-voltage power-down method thereof. Background Art

[0002] my country's fuel cell buses have completed commercial demonstration operations, and fuel cell passenger cars are also developing rapidly. Various performance indicators have basically met operational requirements and are beginning to move towards large-scale industrialization. However, for a new energy system to be promoted and applied, its safety should be the first concern. In the existing technology, the vehicle drive motor and the fuel-electric air compressor are pre-charged at the same time, which poses certain safety risks during the charging and power-off process. Summary of the invention

[0003] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and to propose a dual pre-charging circuit for a hydrogen energy vehicle in which the vehicle drive motor and the fuel-electric air compressor are pre-charged separately, and a pre-charging method thereof, as well as a method for improving the power-off safety of the vehicle drive motor.

[0004] A dual pre-charging circuit for a hydrogen energy vehicle of the present invention comprises a high-voltage auxiliary power supply, a fuel-electric boost FCDC, a motor controller, a voltage reduction DCL, a fuel-electric air compressor controller, a high-voltage component, a first pre-charging circuit and a second pre-charging circuit;

[0005] The motor controller is electrically connected to the vehicle drive motor, and the fuel-electric air compressor controller is electrically connected to the air compressor motor;

[0006] The high-voltage auxiliary power supply, the first pre-charging circuit and the motor controller are connected in series to form a closed circuit, the fuel-electric boost FCDC is connected in parallel at both ends of the high-voltage auxiliary power supply, and the step-down DCL is connected in parallel at both ends of the motor controller;

[0007] The second pre-charging circuit, the fuel-electric air compressor controller and the high-voltage component are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel at both ends of the high-voltage auxiliary power supply;

[0008] The first pre-charging circuit includes a switch K0, a switch K1 and a first pre-charging resistor R1, wherein the switch K1 and the first pre-charging resistor R1 are connected in series in the closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1;

[0009] The second pre-charging circuit includes a switch K2, a switch K3 and a second pre-charging resistor R2. The switch K3 and the second pre-charging resistor R2 are connected in series on the branch, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2.

[0010] Furthermore, the switch K0 includes a first high-voltage positive main positive relay.

[0011] Furthermore, the switch K1 includes a first high-voltage pre-charging relay.

[0012] Furthermore, the switch K2 includes a second high-voltage positive main positive relay.

[0013] Furthermore, the switch K3 includes a second high-voltage pre-charging relay.

[0014] A precharging method for a dual precharging circuit of a hydrogen energy vehicle, the specific process is as follows: when the whole vehicle is powered on at high voltage, the switch K1 is closed first, and current limiting is performed through the first precharging resistor R1, and the high voltage from the high-voltage auxiliary power supply and the fuel-electric boost FCDC is first precharged for the motor controller and the step-down DCL, and after the precharging is completed, the switch K0 is closed first and then the switch K1 is disconnected to complete the precharging of the motor controller and the step-down DCL; then the switch K3 is closed to precharge the fuel-electric air compressor controller and the high-voltage components, and after the precharging is completed, the switch K2 is closed first and then the switch K3 is disconnected to complete the precharging of the fuel-electric air compressor controller and the high-voltage components.

[0015] A precharging method for a dual precharging circuit of a hydrogen energy vehicle, the specific process is as follows: when the whole vehicle is powered on at high voltage, the switch K3 is closed first, and the current is limited through the second precharging resistor R2, and the fuel-electric air compressor controller and the high-voltage components are started to be precharged. After the precharging is completed, the switch K2 is closed first and then the switch K3 is opened to complete the precharging of the fuel-electric air compressor controller and the high-voltage components; then the switch K1 is closed, and the high voltage from the high-voltage auxiliary power supply and the fuel-electric boost FCDC will first precharge the motor controller and the step-down DCL. After the precharging is completed, the switch K0 is closed and then the switch K1 is opened to complete the precharging of the motor controller and the step-down DCL.

[0016] A precharging method for a dual precharging circuit of a hydrogen energy vehicle, the specific process is as follows: when the high voltage of the whole vehicle is powered on, the switch K1 and the switch K3 are closed at the same time, and the first precharging resistor R1 and the second precharging resistor R2 are used to limit the current to precharge the fuel-electric air compressor controller and the high-voltage components. After the precharging is completed, the switch K2 or the switch K0 corresponding to the corresponding precharging circuit is closed first, and then the corresponding switch K1 and the switch K3 are opened to complete the precharging of the fuel-electric air compressor controller and the high-voltage components, the motor controller and the step-down DCL.

[0017] A high-voltage power-off method for a dual pre-charging circuit of a hydrogen energy vehicle, during the high-voltage power-off process, firstly disconnect switch K0, disconnect switch K1, and use the motor controller to start the active discharge function to discharge the motor, and after the discharge is completed, the vehicle drive motor is powered off; then disconnect switch K2, disconnect switch K3, and then use the fuel-electric air compressor controller to start the active discharge function to discharge the air compressor and the high-voltage components, and after the discharge is completed, the branch circuit is powered off.

[0018] The dual pre-charging circuit of a hydrogen energy vehicle of the present invention performs pre-charging of the vehicle drive motor and the fuel-electric air compressor separately during the high-voltage power-on process of the hydrogen energy vehicle. During the high-voltage power-off process of the hydrogen energy vehicle, due to the characteristics of the fuel cell, the vehicle needs to be purged before the high-voltage power-off before it can be shut down. At this time, the design of the dual pre-charging circuit allows the vehicle drive motor to be powered off at high voltage first without waiting for the purging process of the fuel cell system, thereby improving the safety of powering off the vehicle drive motor and preventing the vehicle drive motor from still carrying high voltage when the hydrogen energy vehicle is purged before powering off, posing a safety risk. The dual pre-charging circuit of a hydrogen energy vehicle of the present invention can also prevent the motor from still carrying high voltage when the vehicle is shut down for charging, thereby reducing the existing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a schematic structural diagram of a dual pre-charging circuit for a hydrogen energy vehicle.

[0020] 1. High-voltage auxiliary power supply; 2. Fuel-electric boost FCDC; 3. Motor controller; 4. Step-down DCL; 5. Fuel-electric air compressor controller; 6. High-voltage components; 7. First pre-charging circuit; 8. Second pre-charging circuit; 9. Vehicle drive motor; 10. Air compressor motor. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1 As shown, a dual pre-charging circuit for a hydrogen energy vehicle of the present invention comprises a high-voltage auxiliary power supply 1, a fuel-electric boost FCDC2, a motor controller 3, a voltage reduction DCL4, a fuel-electric air compressor controller 5, a high-voltage component 6, a first pre-charging circuit 7 and a second pre-charging circuit 8;

[0023] The motor controller 3 is electrically connected to the vehicle drive motor 9, and the fuel-electric air compressor controller 5 is electrically connected to the air compressor motor 10;

[0024] The high-voltage auxiliary power supply 1, the first pre-charging circuit 7 and the motor controller 3 are connected in series to form a closed circuit, the fuel-electric boost FCDC2 is connected in parallel to both ends of the high-voltage auxiliary power supply 1, and the step-down DCL4 is connected in parallel to both ends of the motor controller 3;

[0025] The second pre-charging circuit 8, the gas-electric air compressor controller 5 and the high-voltage component 6 are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel to both ends of the high-voltage auxiliary power supply 1;

[0026] The first pre-charging circuit 7 includes a switch K0, a switch K1 and a first pre-charging resistor R1, wherein the switch K1 and the first pre-charging resistor R1 are connected in series in a closed circuit, and the switch K0 is connected in parallel to both ends of the switch K1 and the first pre-charging resistor R1;

[0027] The second pre-charging circuit 8 comprises a switch K2, a switch K3 and a second pre-charging resistor R2. The switch K3 and the second pre-charging resistor R2 are connected in series on the branch circuit, and the switch K2 is connected in parallel between both ends of the switch K3 and the second pre-charging resistor R2.

[0028] A dual pre-charging circuit for a hydrogen energy vehicle of the present invention performs pre-charging of the vehicle drive motor 9 and the fuel-electric air compressor separately during the high-voltage power-on process of the hydrogen energy vehicle. During the high-voltage power-off process of the hydrogen energy vehicle, due to the characteristics of the fuel cell, the vehicle needs to be purged before the high-voltage power-off before it can be shut down. At this time, the design based on the dual pre-charging circuit allows the vehicle drive motor 9 to be powered off at high voltage first without waiting for the purging process of the fuel cell system, thereby improving the safety of powering off the vehicle drive motor 9 and preventing the vehicle drive motor 9 from still carrying high voltage when the hydrogen energy vehicle is purged before powering off, posing a safety risk. The dual pre-charging circuit for a hydrogen energy vehicle of the present invention can also prevent the motor from still carrying high voltage when the vehicle is shut down for charging, thereby reducing the existing safety risks.

[0029] The switch K0 may include a first high voltage positive main positive relay or contactor.

[0030] Switch K1 comprises a first high voltage pre-charge relay or contactor.

[0031] Switch K2 comprises a second high voltage positive main positive relay or contactor.

[0032] Switch K3 comprises a second high voltage pre-charge relay or contactor.

[0033] The function of the step-down DCL4 is to convert the vehicle's DC high voltage into DC low voltage;

[0034] The function of the motor controller 3 is to control the speed and torque of the vehicle drive motor 9;

[0035] The function of the vehicle drive motor 9 is to drive the vehicle;

[0036] The function of the air compressor motor 10 is to increase the pressure of the fuel cell air path and input it to the fuel cell stack;

[0037] The function of the gas-electric air compressor controller 5 is to control the speed, start and stop of the air compressor motor 10;

[0038] The function of the fuel cell boost FCDC2 is to boost the output voltage of the fuel cell and provide it to the vehicle. It has a directional diode inside so no pre-charging is required at its output end.

[0039] High voltage component 6 refers to a high voltage component 6 or accessory having a supporting capacitor or other capacitor inside;

[0040] A precharging method for a dual precharging circuit of a hydrogen energy vehicle, the specific process is as follows: when the whole vehicle is powered on at high voltage, the switch K1 is closed first, and the current is limited through the first precharging resistor R1, and the high voltage from the high-voltage auxiliary power supply 1 and the fuel-electric boost FCDC2 is first used to precharge the motor controller 3 and the step-down DCL4. After the precharging is completed, the switch K0 is closed first and then the switch K1 is disconnected to complete the precharging of the motor controller 3 and the step-down DCL4; then the switch K3 is closed to precharge the fuel-electric air compressor controller 5 and the high-voltage component 6. After the precharging is completed, the switch K2 is closed first and then the switch K3 is disconnected to complete the precharging of the fuel-electric air compressor controller 5 and the high-voltage component 6.

[0041] A precharging method for a dual precharging circuit of a hydrogen energy vehicle, the specific process is as follows: when the whole vehicle is powered on at high voltage, the switch K3 is closed first, and the current is limited through the second precharging resistor R2, and the fuel-electric air compressor controller 5 and the high-voltage component 6 are started to be precharged. After the precharging is completed, the switch K2 is closed first and then the switch K3 is opened to complete the precharging of the fuel-electric air compressor controller 5 and the high-voltage component 6; then the switch K1 is closed, and the high voltage from the high-voltage auxiliary power supply 1 and the fuel-electric boost FCDC2 will first precharge the motor controller 3 and the step-down DCL4. After the precharging is completed, the switch K0 is closed and then the switch K1 is opened to complete the precharging of the motor controller 3 and the step-down DCL4.

[0042] A precharging method for a dual precharging circuit of a hydrogen energy vehicle, the specific process is as follows: when the high voltage of the whole vehicle is powered on, the switch K1 and the switch K3 are closed at the same time, and the fuel-electric air compressor controller 5 and the high-voltage component 6 are pre-charged through the first pre-charging resistor R1 and the second pre-charging resistor R2 for current limiting. After the pre-charging is completed, the switch K2 or the switch K0 corresponding to the corresponding pre-charged circuit is closed first, and then the corresponding switch K1 and the switch K3 are opened to complete the pre-charging of the fuel-electric air compressor controller 5 and the high-voltage component 6, the motor controller 3 and the step-down DCL4.

[0043] A high-voltage power-off method for a dual pre-charging circuit of a hydrogen energy vehicle, during the high-voltage power-off process, firstly disconnect switch K0, disconnect switch K1, and the motor controller 3 starts the active discharge function to discharge it, and after the discharge is completed, the vehicle drive motor 9 is powered off; then disconnect switch K2, disconnect switch K3, and then use the fuel-electric air compressor controller 5 to start the active discharge function to discharge it and the high-voltage component 6, and after the discharge is completed, the branch circuit is powered off.

[0044] For matters not mentioned above, the prior art applies.

[0045] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art to which the present invention belongs may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the direction of the present invention or exceed the scope defined by the attached claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc. made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A precharging method for a dual precharging circuit of a hydrogen energy vehicle, characterized in that: The dual pre-charging circuit of a hydrogen energy vehicle comprises a high-voltage auxiliary power supply (1), a fuel-electric boost FCDC (2), a motor controller (3), a step-down DCL (4), a fuel-electric air compressor controller (5), a high-voltage component (6), a first pre-charging circuit (7) and a second pre-charging circuit (8); The motor controller (3) is electrically connected to the vehicle drive motor (9), and the fuel-electric air compressor controller (5) is electrically connected to the air compressor motor (10); The high-voltage auxiliary power supply (1), the first pre-charging circuit (7) and the motor controller (3) are connected in series to form a closed circuit, the fuel-electric boost FCDC (2) is connected in parallel to both ends of the high-voltage auxiliary power supply (1), and the step-down DCL (4) is connected in parallel to both ends of the motor controller (3); The second pre-charging circuit (8), the fuel-electric air compressor controller (5) and the high-voltage component (6) are sequentially connected in series to form a branch circuit, and the branch circuit is connected in parallel to both ends of the high-voltage auxiliary power supply (1); The first pre-charging circuit (7) comprises a switch K0, a switch K1 and a first pre-charging resistor R1, wherein the switch K1 and the first pre-charging resistor R1 are connected in series in the closed circuit, and the switch K0 is connected in parallel at both ends of the switch K1 and the first pre-charging resistor R1; The second pre-charging circuit (8) comprises a switch K2, a switch K3 and a second pre-charging resistor R2, the switch K3 and the second pre-charging resistor R2 are connected in series on the branch, and the switch K2 is connected in parallel at both ends of the switch K3 and the second pre-charging resistor R2; The specific process of the pre-charging method is as follows: when the vehicle is powered on at high voltage, the switch K1 is first closed, and current is limited through the first pre-charging resistor R1. The high voltage from the high-voltage auxiliary power supply (1) and the fuel-electric boost FCDC (2) is first used to pre-charge the motor controller (3) and the step-down DCL (4). After the pre-charging is completed, the switch K0 is first closed and then the switch K1 is opened to complete the pre-charging of the motor controller (3) and the step-down DCL (4); then the switch K3 is closed to pre-charge the fuel-electric air compressor controller (5) and the high-voltage component (6). After the pre-charging is completed, the switch K2 is first closed and then the switch K3 is opened to complete the pre-charging of the fuel-electric air compressor controller (5) and the high-voltage component (6); When the vehicle is powered on at high voltage, the switch K3 is first closed, and the current is limited through the second pre-charging resistor R2 to start pre-charging the gas-electric air compressor controller (5) and the high-voltage component (6). After the pre-charging is completed, the switch K2 is first closed and then the switch K3 is opened to complete the pre-charging of the gas-electric air compressor controller (5) and the high-voltage component (6); then the switch K1 is closed, and the high voltage from the high-voltage auxiliary power supply (1) and the gas-electric boost FCDC (2) will first pre-charge the motor controller (3) and the step-down DCL (4). After the pre-charging is completed, the switch K0 is closed and then the switch K1 is opened to complete the pre-charging of the motor controller (3) and the step-down DCL (4); When the vehicle is powered on at high voltage, the switch K1 and the switch K3 are closed at the same time, and the fuel-electric air compressor controller (5) and the high-voltage component (6) are pre-charged through the first pre-charging resistor R1 and the second pre-charging resistor R2 for current limiting. After the pre-charging is completed, the switch K2 or the switch K0 corresponding to the corresponding pre-charged circuit is closed first, and then the corresponding switch K1 and the switch K3 are opened to complete the pre-charging of the fuel-electric air compressor controller (5) and the high-voltage component (6), the motor controller (3) and the step-down DCL (4); During the high-voltage power-off process, the switch K0 is first disconnected, and then the switch K1 is disconnected, and the motor controller (3) starts to discharge the motor by an active discharge function, and after the discharge is completed, the vehicle drive motor (9) is powered off; Then, the switch K2 is disconnected, the switch K3 is disconnected, and then the active discharge function of the gas-electric air compressor controller (5) is used to discharge the gas-electric air compressor and the high-voltage component (6). After the discharge is completed, the branch circuit is de-energized.

2. A pre-charging method for a hydrogen energy vehicle dual pre-charging circuit as claimed in claim 1, characterized in that: The switch K0 includes a first high-voltage positive main positive relay.

3. A pre-charging method for a hydrogen energy vehicle dual pre-charging circuit as claimed in claim 2, characterized in that: The switch K1 includes a first high-voltage pre-charging relay.

4. A pre-charging method for a hydrogen energy vehicle dual pre-charging circuit as claimed in claim 3, characterized in that: The switch K2 comprises a second high-voltage positive main positive relay.

5. A pre-charging method for a hydrogen energy vehicle dual pre-charging circuit as claimed in claim 4, characterized in that: The switch K3 includes a second high-voltage pre-charging relay.

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