CN111572365A - Hierarchical pre-charging loop control circuit and control method - Google Patents

Abstract

The invention discloses a hierarchical pre-charging loop control circuit and a control method, comprising a chassis vehicle control unit VCU, a chassis battery management controller BMS and an upper controller VCU; the chassis pre-charging circuit is connected with the chassis pre-charging circuit; the chassis pre-charging circuit is electrically connected to the main electrical appliance system; the upper charging pre-charging circuit is electrically connected with the upper charging electric appliance system; the chassis vehicle controller VCU is electrically connected with a chassis pre-charging circuit, the chassis pre-charging circuit is electrically connected with a chassis battery management controller BMS, and the chassis battery management controller BMS is electrically connected with the power storage battery and the upper controller VCU; the VCU electrically controls the BMS, thereby electrically controlling the main electric system; the VCU of the upper controller electrically controls the BMS of the chassis battery management controller, so that the upper electrical appliance system is electrically controlled to supply power to different driving motor systems in a separated control mode.

Description

Hierarchical pre-charging loop control circuit and control method

Technical Field

The invention belongs to the technical field related to electric control, and particularly relates to a hierarchical pre-charging loop control circuit and a control method.

Background

The existing pure electric engineering vehicle and sanitation vehicle are additionally mounted on a second type chassis to realize the function of a corresponding vehicle type; the problem of matching pre-charging in the power-on process of the pure electric vehicle is solved, and the inverter has capacitors with different sizes, so that the method cannot be completely suitable for all two types of chassis vehicles.

Disclosure of Invention

The present invention provides a hierarchical precharge circuit control circuit and a control method thereof to solve the problems of the background art.

In order to achieve the above object, the specific technical solution of the present invention is as follows:

a hierarchical pre-charging loop control circuit comprises a chassis vehicle control unit VCU, a chassis battery management controller BMS and an upper controller VCU; the chassis pre-charging circuit is connected with the chassis pre-charging circuit; the chassis pre-charging circuit is electrically connected to the main electrical appliance system; the upper charging pre-charging circuit is electrically connected with the upper charging electric appliance system; the chassis vehicle controller VCU is electrically connected with a chassis pre-charging circuit, the chassis pre-charging circuit is electrically connected with a chassis battery management controller BMS, and the chassis battery management controller BMS is electrically connected with the power storage battery and the upper controller VCU; the VCU electrically controls the BMS, thereby electrically controlling the main electric system; the VCU is electrically controlled by the BMS, so that the upper electrical appliance system is electrically controlled.

Further, the chassis pre-charge circuit includes: the power battery comprises a positive and negative electrode main conducting wire, a chassis upper-mounted power-taking port relay K1, a main pre-charging circuit and a negative relay K0, wherein the positive and negative electrode main conducting wire is electrically connected with the positive and negative electrodes of the power battery; the negative relay K0 is connected on a main lead of a negative pole between the negative pole of the power storage battery and the main electric appliance system; the main pre-charging circuit pre-charges a capacitor C in the main electrical appliance system.

Further, the main precharge circuit includes: the power battery pre-charging device comprises a pre-charging relay K2 electrically connected with the + pole end of the power battery, a pre-charging resistor R1 electrically connected with the output end of the pre-charging relay K2 in series, and the other end of the pre-charging resistor R1 is electrically connected with the output end of a relay K1 arranged on the chassis.

Furthermore, an upper fuse is connected in series on the + pole main lead and is connected on the + pole main lead between the + pole end of the power storage battery and the chassis upper electric outlet relay K1.

Further, the main consumer system comprises: the driving circuit comprises an inverter 1 electrically connected with the output end of the main conducting wire of the "+" "-", and a driving motor 1 electrically connected with the inverter 1.

Further, the upper precharge circuit includes: the high-power electric appliance relay K3 is connected with the + pole auxiliary lead in series, and the upper-mounted auxiliary pre-charging circuit is connected with two ends of the upper-mounted high-power electric appliance relay K3 in parallel, the + pole auxiliary lead and the main electric appliance system are connected in parallel, the auxiliary pre-charging circuit and the-pole auxiliary lead are electrically connected to the upper-mounted electric appliance system, and the auxiliary pre-charging circuit pre-charges a capacitor C in the upper-mounted electric appliance system.

Further, the sub precharge circuit includes: the pre-charging relay K4 is electrically connected with the output end of the auxiliary lead of the positive pole, the pre-charging resistor R2 is electrically connected with the output end of the pre-charging relay K4 in series, and the other end of the pre-charging resistor R2 is electrically connected with the output end of the relay K3 for the high-power electrical appliance.

Further, the top-loading electric appliance system includes: an inverter 2 electrically connected with the output end of the positive pole and the negative pole, and a driving motor 2 electrically connected with the inverter 2.

A control method of a hierarchical pre-charging loop control circuit comprises the following steps:

starting an ON gear switch, and simultaneously activating a chassis vehicle controller VCU, a chassis battery management controller BMS and an upper-mounted controller VCU; after the high voltage on the chassis is completed, a negative relay K0 on the main circuit is closed, so that the high voltage '-' of the upper power supply port on the main circuit is in a conducting state, and the following is controlled under the condition of no abnormal condition;

a. the VCU of the chassis vehicle controller electrically controls the BMS, and controls the main electrical appliance system to be powered on and powered off;

b. the VCU of the upper assembling controller electrically controls the BMS of the battery management controller of the chassis, thereby electrically controlling the upper and lower parts of the upper assembling electrical appliance system.

Further, in the power-on control, the main control of the power-on port pre-charging circuit on the main circuit is performed in a: closing a pre-charging relay K2, charging a capacitor C in an inverter 1 in a main electrical appliance system through a pre-charging resistor R1, closing a positive pole relay K1 on a main circuit of a battery end of a power taking port on a chassis after pre-charging when the voltage of the end part of the inverter 1 reaches 90% of the voltage of the battery, and enabling an upper charging port in the main circuit to be in a high-voltage state; the electrification of the main electric appliance system can be completed; if the pre-charging can not be completed according to the specified time, the power-on of the main circuit is failed.

Further, in power-on control, after the power-on port of the main circuit is successfully powered on, the state of a relay at the upper electric appliance end is detected, and if the power-on port is abnormal, the power-on fails; if no abnormity exists, performing power-on and power-off control on the upper electrical appliance system in step b, namely performing auxiliary control on an upper charging port pre-charging loop on the auxiliary circuit:

closing a pre-charging relay K4, charging a capacitor C of an inverter 2 in the upper electrical appliance system through a pre-charging resistor R2, closing a relay K3 of the upper system after pre-charging when the voltage of the end part of the inverter 2 reaches 90% of the voltage of a battery, and enabling a high voltage '+' of the upper high-power electrical appliance to be in a conducting state; the electrification completion of the upper electric appliance system can be realized; if the pre-charging can not be completed according to the specified time, the upper electric appliance in the upper electric appliance system fails to be electrified.

Further, in power-on control, after the power-on of the power-on electric appliance in the power-on electric appliance system is completed, an instruction is sent to the VCU to judge whether power-on is successful.

Further, in the power-off control, when the whole vehicle is in a high-voltage state, the chassis vehicle controller VCU, the chassis battery management controller BMS and the upper controller VCU are all in a high-voltage mode;

when the VCU of the chassis vehicle controller cannot detect the ON shift signal, the VCU of the upper-mounted controller is controlled, so that the upper-mounted high-power electric appliance is controlled to be turned off, and the output power is reduced or turned off; the switching off of the electrical system is performed by the BMS: firstly, the relay K3 is disconnected, so that the high-voltage '+' loop of the upper electrical appliance system is disconnected;

then the relay K1 of the positive pole of the battery of the electricity taking port on the chassis on the main circuit is disconnected, so that the high-voltage '+' loop of the main electric appliance system is disconnected; disconnecting a main negative relay K at the upper battery-taking end; and sending the disconnection result to a chassis vehicle control unit VCU; the VCU judges the command, and if the command is not received, the VCU continuously sends a command for closing the upper-mounted high-power electric appliance to finish the command; and if so, completing the power-off.

Further, when the whole vehicle is in a high-voltage state, the chassis vehicle controller VCU, the chassis battery management controller BMS, and the upper mount controller VCU are all in a high-voltage mode;

when the BMS detects that the battery system has a fault, the signal is transmitted to the VCU, and the BMS performs the following steps of cutting off the electrical system: firstly, the positive relay K3 of the upper-mounted system is disconnected, so that the high-plus loop of the upper-mounted electrical appliance system is disconnected; then the relay K1 on the main circuit is disconnected, so that the high-voltage "+" loop on the main circuit is disconnected; the negative relay K0 on the main circuit is switched off; and sending the disconnection result to a chassis vehicle control unit VCU; the VCU judges the command, and if the command is not received, the VCU continuously sends a closed command for completing the system of the upper electrical equipment; and if so, completing the power-off.

Compared with the prior art, the invention has the following beneficial effects:

after the chassis is electrified, a command is sent to a VCU (vehicle control unit) of the upper vehicle control unit through a Controller Area Network (CAN), the upper vehicle control unit sends a corresponding command through the CAN to control the BMS to close a corresponding pre-charging loop, and different pre-charging loops are closed in a grading, time-sharing and time-sharing mode; the power supply of different drive motor systems is separately controlled. The dependence of the upper electric appliance on the pre-charging loop of the second-class chassis is realized, the condition that the pre-charging loop of the second-class chassis cannot meet the upper charging requirement is avoided, the selection range of the upper charging system of the sanitation vehicle on the second-class chassis is narrowed, and the application width of the upper charging system is improved.

Drawings

FIG. 1 is a control schematic diagram of the present invention;

FIG. 2 is a control schematic of an embodiment of the present invention;

FIG. 3 is a circuit diagram of the present invention;

FIG. 4 is a circuit diagram of an embodiment of the present invention;

FIG. 5 is a circuit diagram showing the structure of the inverter of FIG. 4;

FIG. 6 is a flow chart of normal power-up control;

FIG. 7 is a flow chart of normal power down control;

fig. 8 is a flowchart of the abnormal power down control.

Detailed Description

For a better understanding of the objects, structure and function of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

Referring to fig. 1 and 4, the core control principle in the circuit of the present design is: the VCU of the chassis vehicle controller electrically controls the BMS, so that the BMS can electrically control the main electric system; and the VCU of the upper controller electrically controls the BMS of the battery management controller on the chassis, so that the BMS can electrically control the upper electrical appliance system to be powered on and powered off. As in fig. 2, for example: in this embodiment, the main electrical appliance system is an upper-mounted driving motor 1 system, and the upper-mounted electrical appliance system is an upper-mounted driving motor 2 system, wherein the upper-mounted part takes electricity from the chassis part, the upper-mounted driving motor 1 system can be precharged on the chassis, then the chassis part is provided with an electricity taking port, i.e., a plus-minus-auxiliary wire is led out to achieve electricity taking for the upper-mounted part, and the taken electric energy is precharged to the upper-mounted driving motor 2 system, so that different main and auxiliary precharging loops are closed in a grading, time-sharing and time-sharing manner; the power supply of different drive motor systems is separately controlled.

The core components in the circuit control of the design have the following functions:

k0: the negative relay of the main circuit at the battery end of the chassis is used for controlling the on-off of the high voltage < - >;

k1: the positive relay of the main circuit of the battery end of the power taking port is arranged on the chassis and is used for controlling the on-off of the high voltage '+' of the power taking port arranged on the chassis;

k2: a pre-charging relay of the electricity taking port is arranged on the chassis and used for controlling the on-off of a pre-charging loop;

r1: a pre-charging resistor in a pre-charging loop of the electricity taking port is arranged on the chassis and used for limiting the current in the working process of the pre-charging loop;

k3: the upper system anode relay is used for controlling the on-off of the upper high-power inversion high voltage '+';

k4: the pre-charging relay of the upper system is used for controlling the on-off of a pre-charging loop of the upper high-power inverter; r2: and the pre-charging resistor in the pre-charging loop of the upper charging system is used for limiting the current during the work of the pre-charging loop.

The internal structure of the inverter 1 and the inverter 2 are the same, as shown in fig. 5.

The function of the pre-charging circuit is as follows: the front end of the battery is provided with a large capacitor C, if a pre-charging circuit is not provided, the main relay is directly connected with the capacitor C, the voltage of the battery is high at the moment, the voltage on the capacitor C is close to 0V, the voltage is equivalent to instantaneous short circuit at the moment, the load resistor is a wire and relay contact resistor, the resistance value is small, the voltage is large, the instantaneous current can reach ten thousand amperes, and the main relay can be in an adhesion state to cause vehicle faults; and when the voltage of the capacitor reaches 90% of the voltage of the battery, the main relay is closed, and the protective effect on the main relay can be realized.

As shown in fig. 2, in the control method of the hierarchical pre-charging loop control circuit, in this embodiment, the main electrical appliance system is the upper-mounted driving motor 1 system, and the upper-mounted electrical appliance system is the upper-mounted driving motor 2 system. The circuit control method of the pre-charging loop is integrally divided into three control sub-processes, namely an upper control process, a normal lower control process and an abnormal lower control process; the three control flows are respectively expressed by a control flow chart mode:

first, power-on control strategy flow description (as shown in fig. 6):

1) the method comprises the following steps of turning ON power, activating a chassis vehicle controller VCU, a chassis battery management controller BMS and an upper controller VCU;

2) after the high voltage on the chassis is finished, sending a power-on finishing command to a VCU (vertical control unit);

after receiving the power-on completion instruction, the upper assembly sends an upper assembly power-taking request instruction to the BMS, and the BMS receives the upper assembly power-taking request instruction; detecting the state of a relay at the battery end of the power taking port on the main path, and if the state is abnormal, failing to electrify; if no abnormity exists, closing a negative relay K0 of the main circuit of the upper charging battery end to enable the high voltage '-' of the upper charging power outlet to be in a conducting state; controlling an upper charging port pre-charging loop, closing a pre-charging relay K2, charging a capacitor C of an inverter of the upper charging drive motor system 1 through a pre-charging resistor R1, closing a positive relay K1 of a main circuit of a battery end of an upper charging port on a chassis after pre-charging is completed when the voltage of the end part of the inverter 1 reaches 90% of the voltage of the battery, and keeping the high voltage '+' of the upper charging port on the main circuit in a conducting state; the system of the upper driving motor 1 can be electrified; if the pre-charging can not be completed according to the specified time, the power-on of the power-on port fails.

3) After the BMS is powered on, sending a power-taking port power-on success instruction to the VCU; the VCU judges the instruction, and if the VCU does not receive the instruction, the VCU continuously sends a 'loading power-taking request instruction'; if so, sending a power-taking request instruction of the upper electrical appliance to the BMS; after the BMS receives the 'power-taking request instruction of the upper electric appliance', the state of a relay at the upper electric appliance end is detected, and if the relay is abnormal, the power-on fails; if no abnormity exists, the pre-charging loop of the upper-mounted electrical appliance is controlled, the pre-charging relay K4 is closed, the capacitor C of the inverter of the upper-mounted driving motor system 2 is charged through the pre-charging resistor R2, when the voltage of the inverter end reaches 90% of the voltage of the battery, the upper-mounted system positive pole relay K3 is closed after pre-charging is completed, and the high voltage '+' of the upper-mounted high-power electrical appliance is in a conducting state; the system of the upper driving motor 2 can be electrified; if the pre-charging can not be completed according to the specified time, the power-on of the upper electric appliance fails.

4) After the power-on of the upper electrical appliance in the upper part is finished, sending an electrical appliance power-on success instruction to the upper controller VCU; the VCU judges the instruction, and if the VCU does not receive the instruction, the VCU continuously sends a 'power-on request instruction of the upper electric appliance'; if so, successfully powering up;

5) if the detection of the judgment frame is 'no', the position judges that the flow cycle time is 5s, and reports the corresponding fault to the detection control module after the flow cycle time exceeds 5 s.

Wherein: the detection of the state of the relay of the whole vehicle is required to be the actual state fed back in real time.

Second, normally control the flow of electricity (see fig. 7):

1) when the whole vehicle is in a high-voltage state, the chassis vehicle controller VCU, the chassis battery management controller BMS and the upper loading controller VCU are all in a high-voltage mode;

2) when the VCU of the chassis vehicle controller does not detect the ON gear signal, sending a vehicle high-voltage request command to the BMS; after receiving the 'high-voltage request command under the whole vehicle', the BMS sends a 'high-voltage request command under the upper electric appliance' to the VCU;

3) after the VCU receives a 'high-voltage-down request instruction of the upper electrical appliance'; the high-power electrical appliance is turned off to realize the reduction or the turn-off of the output power; sending a command for completing turning off the upper high-power electric appliance to the BMS; the BMS judges the command, and if the command is not received, the BMS continuously sends a 'high voltage down request command of the upper electric appliance'; if the power supply is received, the BMS executes the action of cutting off the electric appliance series (firstly disconnecting the positive relay K3 of the upper system to realize the disconnection of the high-voltage '+' loop of the upper system driving motor 2 system, then disconnecting the positive relay K1 of the main circuit of the battery end of the power taking port on the chassis to realize the disconnection of the high-voltage '+' loop of the upper system driving motor 1 system, and disconnecting the negative relay K0 of the main circuit of the upper system power taking battery end); and sending the disconnection result to a VCU (vehicle control unit); the whole vehicle control judges the command, and if the command is not received, the command of closing the upper-mounted high-power electric appliance to finish is continuously sent; and if so, completing the power-off.

Thirdly, the abnormal power-off control flow is explained (as shown in fig. 8):

1) when the whole vehicle is in a high-voltage state, the chassis vehicle controller VCU, the chassis battery management controller BMS and the upper loading controller VCU are all in a high-voltage mode;

2) when the BMS detects that the battery system has three-level faults, a high-voltage command is sent to request; the VCU of the chassis vehicle controller detects the instruction, and if the instruction is not received and the vehicle has no three-level fault, the vehicle controller does not process the instruction; if the fault condition is received, or the whole vehicle has three-level faults; a chassis vehicle controller VCU sends a 'vehicle high voltage request instruction'; the BMS detects the command, and if the command is not received, the command is continuously sent to 'request high voltage command'; if the command is received, the BMS sends a 'high-voltage-down request command of the upper electric appliance' to the upper control VCU;

3) after the VCU receives a 'high-voltage-down request instruction of the upper electrical appliance'; the high-power electrical appliance is turned off to realize the reduction of output power or the turning-off working state; sending a command for completing turning off the upper high-power electric appliance to the BMS; the BMS judges the command, and if the command is not received, the BMS continuously sends a 'high voltage down request command of the upper electric appliance'; if the power supply system receives the power supply system power supply signal, the BMS executes the action of cutting off the electric appliance series (firstly, the positive relay K3 of the upper system is cut off to realize the high-voltage + loop disconnection of the upper system driving motor 2 system, then, the positive relay K1 of the main circuit of the battery end of the power taking port on the chassis is cut off to realize the high-voltage "+" loop disconnection of the upper system driving motor 1 system, and the main negative relay K0 of the upper system power taking battery end is cut off); and sending the disconnection result to a chassis vehicle control unit VCU; the whole vehicle control judges the command, and if the command is not received, the command of closing the upper-mounted high-power electric appliance to finish is continuously sent; and if so, completing the power-off.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (14)

1. A hierarchical pre-charging loop control circuit comprises a chassis vehicle control unit VCU, a chassis battery management controller BMS and an upper controller VCU;

the method is characterized in that: the chassis pre-charging circuit is connected with the chassis pre-charging circuit; the chassis pre-charging circuit is electrically connected to the main electrical appliance system; the upper charging pre-charging circuit is electrically connected with the upper charging electric appliance system;

the chassis vehicle controller VCU is electrically connected with a chassis pre-charging circuit, the chassis pre-charging circuit is electrically connected with a chassis battery management controller BMS, and the chassis battery management controller BMS is electrically connected with the power storage battery and the upper controller VCU;

the VCU electrically controls the BMS, thereby electrically controlling the main electric system;

the VCU is electrically controlled by the BMS, so that the upper electrical appliance system is electrically controlled.

2. The hierarchical precharge circuit control circuit of claim 1, wherein the chassis precharge circuit comprises: the power battery comprises a positive and negative electrode main conducting wire, a chassis upper-mounted power-taking port relay K1, a main pre-charging circuit and a negative relay K0, wherein the positive and negative electrode main conducting wire is electrically connected with the positive and negative electrodes of the power battery; the negative relay K0 is connected on a main lead of a negative pole between the negative pole of the power storage battery and the main electric appliance system; the main pre-charging circuit pre-charges a capacitor C in the main electrical appliance system.

3. The hierarchical precharge circuit control circuit of claim 2, wherein the main precharge circuit comprises: the power battery pre-charging device comprises a pre-charging relay K2 electrically connected with the + pole end of the power battery, a pre-charging resistor R1 electrically connected with the output end of the pre-charging relay K2 in series, and the other end of the pre-charging resistor R1 is electrically connected with the output end of a relay K1 arranged on the chassis.

4. The graded pre-charging circuit control circuit according to claim 3, wherein an upper fuse is further connected in series on the + pole main lead, and the upper fuse is connected on the + pole main lead between the + pole terminal of the power storage battery and a chassis-mounted power-supply-port relay K1.

5. The staged pre-charge loop control circuit of claim 4, wherein the main consumer system comprises: the driving circuit comprises an inverter 1 electrically connected with the output end of the main conducting wire of the "+" "-", and a driving motor 1 electrically connected with the inverter 1.

6. The hierarchical precharge circuit control circuit of claim 5, wherein the upper precharge circuit comprises: the high-power electric appliance relay K3 is connected with the + pole auxiliary lead in series, and the upper-mounted auxiliary pre-charging circuit is connected with two ends of the upper-mounted high-power electric appliance relay K3 in parallel, the + pole auxiliary lead and the main electric appliance system are connected in parallel, the auxiliary pre-charging circuit and the-pole auxiliary lead are electrically connected to the upper-mounted electric appliance system, and the auxiliary pre-charging circuit pre-charges a capacitor C in the upper-mounted electric appliance system.

7. The hierarchical precharge circuit control circuit of claim 6, wherein the secondary precharge circuit comprises: the pre-charging relay K4 is electrically connected with the output end of the auxiliary lead of the positive pole, the pre-charging resistor R2 is electrically connected with the output end of the pre-charging relay K4 in series, and the other end of the pre-charging resistor R2 is electrically connected with the output end of the relay K3 for the high-power electrical appliance.

8. The staged pre-charge loop control circuit of claim 7, wherein said top-loading electrical consumer system comprises: an inverter 2 electrically connected with the output end of the positive pole and the negative pole, and a driving motor 2 electrically connected with the inverter 2.

9. A control method using the hierarchical precharge circuit control circuit of claim 8, comprising the steps of:

starting an ON gear switch, and simultaneously activating a chassis vehicle controller VCU, a chassis battery management controller BMS and an upper-mounted controller VCU; after the high voltage on the chassis is completed, a negative relay K0 on the main circuit is closed, so that the high voltage '-' of the upper power supply port on the main circuit is in a conducting state, and the following is controlled under the condition of no abnormal condition;

a. and main road control: the VCU of the chassis vehicle controller electrically controls the BMS, and controls the main electrical appliance system to be powered on and powered off;

b. and (3) secondary control: the VCU of the upper assembling controller electrically controls the BMS of the battery management controller of the chassis, thereby electrically controlling the upper and lower parts of the upper assembling electrical appliance system.

10. The control method of the hierarchical precharge circuit control circuit according to claim 9, wherein in the power-up control, the main control of the power-up port precharge circuit on the main path is performed: closing a pre-charging relay K2, charging a capacitor C in an inverter 1 in a main electrical appliance system through a pre-charging resistor R1, closing a positive pole relay K1 on a main circuit of a battery end of a power taking port on a chassis after pre-charging when the voltage of the end part of the inverter 1 reaches 90% of the voltage of the battery, and enabling an upper charging port in the main circuit to be in a high-voltage state; the electrification of the main electric appliance system can be completed; if the pre-charging can not be completed according to the specified time, the power-on of the main circuit is failed.

11. The method according to claim 10, wherein in the power-on control, after the power-on of the main circuit is successfully performed, the state of the relay at the power-on end of the main circuit is detected, and if there is an abnormality, the power-on fails; if no abnormity exists, performing power-on and power-off control on the upper electrical appliance system in step b, namely performing auxiliary control on an upper charging port pre-charging loop on the auxiliary circuit:

closing a pre-charging relay K4, charging a capacitor C of an inverter 2 in the upper electrical appliance system through a pre-charging resistor R2, closing a relay K3 of the upper system after pre-charging when the voltage of the end part of the inverter 2 reaches 90% of the voltage of a battery, and enabling a high voltage '+' of the upper high-power electrical appliance to be in a conducting state; the electrification completion of the upper electric appliance system can be realized; if the pre-charging can not be completed according to the specified time, the upper electric appliance in the upper electric appliance system fails to be electrified.

12. The method as claimed in claim 11, wherein in the power-on control, after the power-on of the power-on system is completed, the power-on system sends a command to the VCU to determine whether the power-on is successful.

13. The method of claim 11, wherein in the power down control, when the vehicle is in the high voltage state, the chassis vehicle controller VCU, the chassis battery management controller BMS, and the upper controller VCU are all in the high voltage mode;

when the VCU of the chassis vehicle controller cannot detect the ON shift signal, the VCU of the upper-mounted controller is controlled, so that the upper-mounted high-power electric appliance is controlled to be turned off, and the output power is reduced or turned off; the switching off of the electrical system is performed by the BMS: firstly, the relay K3 is disconnected, so that the high-voltage '+' loop of the upper electrical appliance system is disconnected;

then the relay K1 of the positive pole of the battery of the electricity taking port on the chassis on the main circuit is disconnected, so that the high-voltage '+' loop of the main electric appliance system is disconnected; disconnecting a main negative relay K at the upper battery-taking end; and sending the disconnection result to a chassis vehicle control unit VCU; the VCU judges the command, and if the command is not received, the VCU continuously sends a command for closing the upper-mounted high-power electric appliance to finish the command; and if so, completing the power-off.

14. The method of claim 11, wherein when the vehicle is in the high voltage state, the chassis vehicle controller VCU, the chassis battery management controller BMS, and the upper controller VCU are all in the high voltage mode;

when the BMS detects that the battery system has a fault, the signal is transmitted to the VCU, and the BMS performs the following steps of cutting off the electrical system: firstly, the positive relay K3 of the upper-mounted system is disconnected, so that the high-plus loop of the upper-mounted electrical appliance system is disconnected; then the relay K1 on the main circuit is disconnected, so that the high-voltage "+" loop on the main circuit is disconnected; the negative relay K0 on the main circuit is switched off; and sending the disconnection result to a chassis vehicle control unit VCU; the VCU judges the command, and if the command is not received, the VCU continuously sends a closed command for completing the system of the upper electrical equipment; and if so, completing the power-off.

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