CN115416597A

CN115416597A - Vehicle-mounted DCDC (direct current DC) awakening method and device for pure electric vehicle

Info

Publication number: CN115416597A
Application number: CN202211230903.XA
Authority: CN
Inventors: 肖恩; 程尧; 赵健生; 王界行; 於家华; 汪斌; 郭良华; 周欢; 景琳璞; 付英; 赵勇; 王哲; 赵宏耀
Original assignee: Dongfeng Automobile Co Ltd
Current assignee: Dongfeng Automobile Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-02
Anticipated expiration: 2042-09-30
Also published as: CN115416597B

Abstract

The application relates to a pure electric vehicle-mounted DCDC awakening method and a device, relating to the technical field of vehicle control, wherein the method comprises a normal power-on state awakening sub-process, and the normal power-on state awakening sub-process comprises the following steps: the vehicle control unit wakes up a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, normal information of the state of the power battery is fed back to the vehicle control unit; the vehicle control unit issues a main and negative relay actuation instruction based on the power battery state normal information, and the BMS module actuates the main and negative relays in the negative pole of the power battery pack and feeds the actuation state back to the vehicle control unit; the high-voltage input end of the vehicle-mounted DCDC converter is awakened and enters a standby state, and first preset DC-DC information related to DC-DC is sent to the whole vehicle CAN. The timing sequence is clear and definite when awakening, the anti-interference performance is strong, and the stability of vehicle starting is improved.

Description

Vehicle-mounted DCDC (direct current DC) awakening method and device for pure electric vehicle

Technical Field

The application relates to the technical field of vehicle control, in particular to a pure electric vehicle-mounted DCDC awakening method and device.

Background

The traditional DCDC converter awakening modes are CAN line awakening and hard line awakening; although convenient succinct is awaken up with the hardwire to use the CAN line to awaken up, when DCDC converter anti-interference ability is not strong, receive whole car CAN easily and disturb and lead to awakening up the failure, influence customer and use and experience, be unfavorable for vehicle troubleshooting simultaneously, if awaken the mode and distinguish with other electrical parts, CAN comparatively conveniently judge trouble problem point.

Therefore, how to improve the anti-interference performance in the pure electric vehicle-mounted DCDC wake-up work is a technical problem which needs to be solved urgently at present.

Disclosure of Invention

The application provides a pure electric vehicle-mounted DCDC awakening method and device, the awakening time sequence is clear and definite, the anti-interference performance is strong, and the stability of vehicle starting is improved.

To achieve the above object, the present application provides the following aspects.

In a first aspect, the present application provides a pure electric vehicle-mounted DCDC wake-up method, where the method includes a normal power-on state wake-up sub-process, where the normal power-on state wake-up sub-process includes the following steps:

the vehicle control unit receives an ON electric hard wire signal and enters an awakening state, the vehicle control unit carries out self-checking whether a fault exists, if the fault does not exist, the normal power-ON state awakening sub-process is continuously executed, otherwise, the normal power-ON state awakening sub-process is terminated;

the vehicle control unit wakes up a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, normal information of the state of the power battery is fed back to the vehicle control unit;

the whole vehicle controller issues a main and negative relay pull-in instruction based on the normal state information of the power battery, the BMS module responds to the main and negative relay pull-in instruction, pulls in a main and negative relay in the negative pole of the power battery pack and feeds back the pull-in state to the whole vehicle controller;

after a main negative relay of the power battery pack is closed, a high-voltage input end of the vehicle-mounted DCDC converter is awakened and enters a standby state, and first preset DC-DC information related to DC-DC is sent to a finished vehicle CAN;

if the whole vehicle CAN receives the first DC-DC information within preset judging time, judging that the awakening is successful, otherwise, judging that the awakening is failed.

Further, the method further includes an ac charging state wake-up sub-process, where the ac charging state wake-up sub-process includes the following steps:

after the alternating current charging gun is inserted into the alternating current charging gun, the alternating current charging gun is connected with the alternating current interface, the vehicle-mounted charger receives a 220V alternating current signal and wakes up the whole vehicle controller through the alternating current interface;

the vehicle control unit automatically detects whether a fault exists, if the fault does not exist, the AC charging state awakening sub-process is continuously executed, otherwise, the AC charging state awakening sub-process is terminated;

the vehicle control unit wakes up a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, normal state information of the power battery is fed back to the vehicle control unit;

the vehicle control unit issues a main and negative relay pull-in instruction based on the power battery state normal information, the BMS module responds to the main and negative relay pull-in instruction, pulls in a main and negative relay in the negative pole of the power battery pack and feeds back the pull-in state to the vehicle control unit;

after a main negative relay of the power battery pack is closed, a high-voltage input end of the vehicle-mounted DCDC converter is awakened and enters a standby state, and preset second DC-DC information related to DC-DC is sent to a finished vehicle CAN;

if the whole vehicle CAN receives the second DC-DC information within the preset judgment time, the awakening is judged to be successful, otherwise, the awakening is judged to be failed.

Further, the method further includes a dc charging state wake-up sub-process, where the dc charging state wake-up sub-process includes the following steps:

the direct-current charging gun is connected with the direct-current interface after being inserted into the gun, and the direct-current interface wakes up the whole vehicle controller;

the vehicle controller detects whether a fault exists, if no fault exists, the direct current charging state awakening sub-process is continuously executed, otherwise, the direct current charging state awakening sub-process is terminated;

after a main negative relay of the power battery pack is closed, a high-voltage input end of the vehicle-mounted DCDC converter is awakened and enters a standby state, and preset third DC-DC information related to DC-DC is sent to a finished vehicle CAN;

if the whole vehicle CAN receives the third DC-DC information within the preset judgment time, the awakening is judged to be successful, otherwise, the awakening is judged to be failed.

Further, the method comprises the following steps:

and the DCDC converter performs self-checking to judge whether a fault exists, stops working and feeds back the state if the fault exists, and otherwise stops working and feeds back the state after receiving a DCDC enabling stop instruction issued by the VCU of the vehicle controller.

Specifically, a main negative relay is arranged in the power battery pack, the main negative relay is connected to the negative electrode of the power battery pack, the negative electrode of the power battery pack is connected with the main negative end and the negative end of a high-voltage distribution box PDU, and the main negative end and the negative end of the high-voltage distribution box PDU are connected with the negative input end of a DCDC converter;

the positive electrode of the power battery pack is connected with the positive electrode input end of the DCDC converter through a main positive copper bar of the high-voltage distribution box PDU and the DCDC fuse in sequence;

the VCU of the vehicle control unit is sequentially connected with the BMS, the high-voltage distribution box PDU, the DCDC converter and the vehicle-mounted charging OBC in the power battery pack through CAN lines;

the negative electrode of the alternating current charging interface is connected with the negative electrode of a vehicle-mounted charger OBC, the negative electrode of the vehicle-mounted charger OBC is connected with the main negative electrode of a high-voltage distribution box PDU, and the main negative electrode of the high-voltage distribution box PDU is connected with the negative electrode of the power battery pack;

the positive electrode of the alternating current charging interface is connected with the positive electrode of a vehicle-mounted charger OBC, the positive electrode of the vehicle-mounted charger OBC is connected with an alternating current relay and an alternating current charging fuse in a high-voltage distribution box PDU (Power distribution Unit), and the positive electrode of the high-voltage distribution box PDU is connected with the positive electrode of the power battery pack;

the negative electrode of the direct-current charging interface is connected with the main negative electrode of the high-voltage distribution box PDU, and the main negative electrode of the high-voltage distribution box PDU is connected with the negative electrode of the power battery pack;

the positive pole of the direct current charging seat interface is connected with a direct current relay and a direct current fuse in a high-voltage distribution box PDU (Power distribution Unit) to the positive pole of the high-voltage distribution box PDU, and the positive pole of the high-voltage distribution box PDU is connected with the positive pole of a power battery pack;

the positive electrode of the low-voltage storage battery is connected with the positive electrode output end of the DCDC converter;

and the negative electrode of the low-voltage storage battery is connected with the negative electrode output end of the DCDC converter.

In a second aspect, the application provides a pure electric vehicle-mounted DCDC wake-up device, which includes a normal power-on state wake-up sub-module;

the normal power-ON state awakening submodule is used for controlling the whole vehicle controller to receive an ON electric hard wire signal and enter an awakening state, the whole vehicle controller detects whether a fault exists, if the fault does not exist, the normal power-ON state awakening sub-process is continuously executed, otherwise, the normal power-ON state awakening sub-process is terminated;

the normal power-on state awakening sub-module is also used for controlling the whole vehicle controller to awaken a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, the normal state information of the power battery is fed back to the whole vehicle controller;

the normal power-on state awakening submodule is also used for controlling the whole vehicle controller to issue a main and negative relay actuation instruction based on the power battery state normal information, the BMS module responds to the main and negative relay actuation instruction, actuates a main and negative relay in the negative pole of the power battery pack and feeds back the actuation state to the whole vehicle controller;

the normal power-on state awakening submodule is also used for controlling a high-voltage input end of the vehicle-mounted DCDC converter to be awakened and enter a standby state after a main negative relay of the power battery pack is attracted, and sending preset first DC-DC information related to DC-DC to the whole vehicle CAN;

and the normal power-on state awakening sub-module is further used for judging that the awakening is successful if the whole vehicle CAN receives the first DC-DC information within a preset judgment time, and otherwise, judging that the awakening is failed.

Further, the device also comprises an alternating current charging state awakening submodule;

the alternating current charging state awakening submodule is used for connecting an alternating current interface after an alternating current charging gun is inserted into the alternating current charging gun, and controlling the vehicle-mounted charger to awaken the vehicle controller through the alternating current interface after the vehicle-mounted charger receives a 220V alternating current signal to be awakened;

the alternating current charging state awakening sub-module is also used for controlling the whole vehicle controller to carry out self-checking whether a fault exists or not, if the fault does not exist, the alternating current charging state awakening sub-process is continuously executed, otherwise, the alternating current charging state awakening sub-process is stopped;

the alternating current charging state awakening submodule is also used for controlling the whole vehicle controller to awaken a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, the normal information of the power battery state is fed back to the whole vehicle controller;

the alternating current charging state awakening submodule is also used for controlling the whole vehicle controller to issue a main and negative relay actuation instruction based on the power battery state normal information, the BMS module responds to the main and negative relay actuation instruction, actuates a main and negative relay in the negative pole of the power battery pack and feeds back the actuation state to the whole vehicle controller;

the alternating current charging state awakening submodule is also used for controlling the high-voltage input end of the vehicle-mounted DCDC converter to be awakened and enter a standby state after a main negative relay of the power battery pack is attracted, and sending preset second DC-DC information related to DC-DC to the whole vehicle CAN;

the alternating current charging state awakening submodule is further used for judging that awakening is successful if the whole vehicle CAN receives the second DC-DC information within preset judging time, and otherwise, judging that awakening is failed.

Further, the device also comprises a direct current charging state awakening submodule;

the direct-current charging state awakening sub-module is used for connecting the direct-current charging gun with the direct-current interface after the direct-current charging gun is inserted into the direct-current charging gun, and awakening the whole vehicle controller based on the direct-current interface;

the direct current charging state awakening sub-module is also used for controlling the whole vehicle controller to carry out self-checking whether a fault exists or not, if the fault does not exist, the direct current charging state awakening sub-process is continuously executed, otherwise, the direct current charging state awakening sub-process is terminated;

the direct current charging state awakening submodule is also used for controlling the whole vehicle controller to awaken a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, the normal information of the power battery state is fed back to the whole vehicle controller;

the direct current charging state awakening submodule is also used for controlling the whole vehicle controller to issue a main and negative relay pull-in instruction based on the power battery state normal information, the BMS module responds to the main and negative relay pull-in instruction, pulls in a main and negative relay in the negative pole of the power battery pack and feeds back the pull-in state to the whole vehicle controller;

the direct current charging state awakening submodule is also used for controlling the high-voltage input end of the vehicle-mounted DCDC converter to be awakened and enter a standby state after a main negative relay of the power battery pack is attracted, and sending preset third DC-DC information related to DC-DC to the whole vehicle CAN;

and the direct current charging state awakening submodule is also used for judging that the awakening is successful if the whole vehicle CAN receives the third DC-DC information within preset judging time, and otherwise, judging that the awakening is failed.

Further, the device also comprises a DCDC converter self-checking module;

the self-checking module of the DCDC converter is used for controlling the DCDC converter to carry out self-checking, judging whether a fault exists or not, stopping working and feeding back the state if the fault exists, and otherwise stopping working and feeding back the state after receiving a DCDC enabling stop instruction issued by a VCU of the vehicle control unit.

the positive electrode of the alternating current charging interface is connected with the positive electrode of a vehicle-mounted charger OBC, the positive electrode of the vehicle-mounted charger OBC is connected with an alternating current relay and an alternating current charging fuse in the high-voltage distribution box PDU to the positive electrode of the high-voltage distribution box PDU, and the positive electrode of the high-voltage distribution box PDU is connected with the positive electrode of the power battery pack;

The beneficial effect that technical scheme that this application provided brought includes:

in this application, awaken up after vehicle control unit VCU and power battery package BMS normal work, awaken up the chronogenesis clearly and definitely, interference immunity is strong, and the vehicle reduces the load factor of whole car CAN when going up electricity, alternating current-direct current charge, improves the stability that the vehicle was gone up the electricity and was started, the alternating current-direct current charges and starts.

This application uses the high-voltage direct current of power battery package end to awaken up, as long as power battery package owner negative relay actuation, is connected to on-vehicle DCDC converter high-voltage input end through the DCDC insurance in the high-voltage distribution box PDU, and the DCDC converter just awakens up to the 300VDC that the high-voltage input detected, and is high-efficient swift, and stability is high, awakens up the process and does not receive whole car CAN communication interference, reasonable in design, and the effect is obvious.

Drawings

Interpretation of terms:

DCDC: DC/DC, direct Current, DC converter;

BMS: battery Management System, battery Management System;

CAN: controller Area Network, controller Area Network;

VCU: a vessel control Unit, high voltage distribution box;

PDU: power Distribution Unit, protocol data Unit;

and (3) OBC: on-Board Charger, vehicle Charger.

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a hardware structure block diagram of a pure electric vehicle-mounted DCDC wake-up method provided in an embodiment of the present application;

fig. 2 is a flowchart illustrating steps of a normal power-on state wake-up sub-process of a pure electric vehicle-mounted DCDC wake-up method provided in an embodiment of the present application;

fig. 3 is a flowchart illustrating steps of an ac charging state wake-up sub-process of a pure electric vehicle-mounted DCDC wake-up method provided in an embodiment of the present application;

fig. 4 is a flowchart of steps of a dc charging state wake-up sub-process of the pure electric vehicle-mounted DCDC wake-up method provided in the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides a pure electric vehicle-mounted DCDC awakening method and device, the awakening time sequence is clear and clear, the anti-interference performance is strong, and the stability of vehicle starting is improved.

In order to achieve the technical effect, the general idea of the application is as follows:

a pure electric vehicle-mounted DCDC awakening method comprises a normal power-on state awakening sub-process, wherein the normal power-on state awakening sub-process comprises the following steps:

if the whole vehicle CAN receives the first DC-DC information within the preset judgment time, the awakening is judged to be successful, otherwise, the awakening is judged to be failed.

The embodiment of the application provides a pure electric vehicle-mounted DCDC awakening method, which comprises a normal power-on state awakening sub-process, wherein the normal power-on state awakening sub-process comprises the following steps:

In the embodiment of the application, the vehicle controller VCU and the power battery pack BMS are awakened after normal work, the awakening time sequence is clear and clear, the anti-interference performance is strong, the load rate of the whole vehicle CAN is reduced when the vehicle is electrified and charged by alternating current and direct current, and the stability of electrifying, starting and charging of the alternating current and direct current of the vehicle is improved.

In addition, this application embodiment uses the high voltage direct current of power battery package end to awaken up, as long as power battery package owner negative relay actuation is connected to on-vehicle DCDC converter high-voltage input end through the DCDC insurance in the high voltage distribution box PDU, and the DCDC converter just is awaken up to the 300VDC that the high-voltage input end detected, and is high-efficient swift, and stability is high, awakens up the process and does not receive whole car CAN communication interference, reasonable in design, and the effect is obvious.

It should be noted that 300VDC in the embodiment of the present application is a specific example of a preset dc voltage threshold range, and actually, when the dc voltage value is detected to be in the preset dc voltage threshold range, the corresponding operation can be performed, and is not limited to 300VDC only.

after the alternating-current charging gun is inserted into the alternating-current interface, the alternating-current charging gun is connected with the alternating-current interface, the vehicle-mounted charger receives a 220V alternating-current signal to be awakened, and the vehicle controller is awakened through the alternating-current interface;

the vehicle controller automatically detects whether a fault exists, if the fault does not exist, the AC charging state awakening sub-process is continuously executed, otherwise, the AC charging state awakening sub-process is terminated;

if the whole vehicle CAN receives the third DC-DC information within the preset judgment time, the whole vehicle CAN judges that the awakening is successful, otherwise, the whole vehicle CAN judges that the awakening is failed.

Further, the method comprises the following steps:

the positive electrode of the direct current charging seat interface is connected with a direct current relay and a direct current fuse in the high-voltage distribution box PDU to the positive electrode of the high-voltage distribution box PDU, and the positive electrode of the high-voltage distribution box PDU is connected with the positive electrode of the power battery pack;

It should be noted that, as shown in fig. 1 of the drawings in the specification, the hardware basis for implementing the embodiment of the present application includes the following:

a main negative relay is arranged in the power battery pack 1, the main negative relay is connected to the negative electrode of the power battery pack, the negative electrode of the power battery pack is connected with the main negative end of a high-voltage distribution box PDU2, and the main negative end of the high-voltage distribution box PDU2 is connected with the negative electrode input end of a DCDC converter 3;

the positive electrode of the power battery pack 1 is connected with the positive electrode input end of the DCDC converter 3 through a main positive copper bar of a high-voltage distribution box PDU2 and a DCDC fuse in sequence;

the vehicle control unit VCU6 is sequentially connected with the BMS, the high-voltage distribution box PDU2, the DCDC converter 3 and the vehicle-mounted charging OBC4 in the power battery pack 1 through CAN lines;

the negative electrode of the alternating current charging interface 7 is connected with the negative electrode of a vehicle-mounted charger OBC4, the negative electrode of the vehicle-mounted charger OBC4 is connected with the main negative electrode of a high-voltage distribution box PDU2, and the main negative electrode of the high-voltage distribution box PDU2 is connected with the negative electrode of a power battery pack 1;

the positive electrode of the alternating current charging interface 7 is connected with the positive electrode of a vehicle-mounted charger OBC4, the positive electrode of the vehicle-mounted charger OBC4 is connected with an alternating current relay and an alternating current charging fuse in the high-voltage distribution box PDU2 to be connected with the positive electrode of the high-voltage distribution box PDU2, and the positive electrode of the high-voltage distribution box PDU2 is connected with the positive electrode of the power battery pack 1;

the negative electrode of the direct-current charging interface 8 is connected with the main negative electrode of the high-voltage distribution box PDU2, and the main negative electrode of the high-voltage distribution box PDU2 is connected with the negative electrode of the power battery pack 1;

the positive electrode of the direct current charging seat interface 8 is connected with a direct current relay and a direct current fuse in the high-voltage distribution box PDU2 to the positive electrode of the high-voltage distribution box PDU2, and the positive electrode of the high-voltage distribution box PDU2 is connected with the positive electrode of the power battery pack 1;

the positive electrode of the low-voltage storage battery 5 is connected with the positive electrode output end of the DCDC converter 3;

and the negative electrode of the low-voltage storage battery 5 is connected with the negative electrode output end of the DCDC converter 3.

The conventional design uses CAN to awaken or hard wire to awaken, and the DCDC converter is awakened to fail due to interference of the whole vehicle when the power is on or the charging is started under partial conditions, so that a fault is reported, and the customer experience is influenced. According to the design, the DCDC converter is awakened through the 300VDC of the high-voltage end of the power battery pack, the awakening failure rate of the DCDC caused by the interference of the whole vehicle is reduced, the use experience of a customer is improved, and troubleshooting is facilitated.

Based on the technical scheme, the method comprises a normal power-on state awakening sub-process, an alternating current charging state awakening sub-process and a direct current charging state awakening sub-process.

First, as shown in fig. 2 of the drawings, the normal power-on state wake-up sub-process includes the following steps:

a1, inserting a vehicle key into a key hole, rotating an ON gear ON the key, awakening a Vehicle Control Unit (VCU) after receiving an ON electric hard wire signal of a central control lock (an ignition switch), self-checking whether a fault exists in the Vehicle Control Unit (VCU), directly reporting to an instrument when the fault exists, stopping awakening other electric devices, and performing the next action when the fault does not exist.

A2, the VCU of the vehicle controller wakes up a BMS module in the power battery pack through a hard-line signal, the BMS module self-checks the relevant information of the power battery pack after waking up, a fault directly feeds back the VCU of the vehicle controller and stops working, the VCU of the vehicle controller reports an instrument, and a normal state is fed back to the VCU of the vehicle controller without fault.

A3, after receiving BMS module feedback information in the power battery pack, the VCU of the vehicle control unit issues a main negative relay pull-in instruction, the BMS module pulls in a main negative relay in the negative pole of the power battery pack after receiving the instruction and feeds back a pull-in state to the VCU of the vehicle control unit, and if the BMS module feeds back the pull-in failure of the main negative relay, the VCU of the vehicle control unit feeds back fault information to the VCU of the vehicle control unit and stops working.

A4, after the main negative relay of the power battery pack is attracted, the main negative relay in the negative electrode of the power battery pack is attracted at the moment, 300VDC (range value) is connected to the positive electrode of the high-voltage input end of the vehicle-mounted DCDC converter through a main positive copper bar on the high-voltage distribution box PDU and a DCDC fuse, the negative electrode of the high-voltage input end of the DCDC converter is connected to the main negative copper bar inside the high-voltage distribution box PDU and is connected to the positive electrode of the power battery pack to form a loop, the high-voltage input end of the vehicle-mounted DCDC converter detects 300VDC to be awakened and enters a standby state, and DC-DC related information is sent to a CAN of the whole vehicle through a CAN message.

A5, the VCU of the vehicle control unit starts to detect whether a message sent by the DCDC converter is received in the CAN of the vehicle after receiving the attraction state of the main negative relay fed back by the BMS module of the power battery pack, the VCU of the vehicle control unit judges that the DCDC converter is successfully awakened when the detection time of the VCU of the vehicle control unit is 3S and the message sent to the DCDC converter within 3S, and sends a working voltage and enabling state instruction to the DCDC converter, and the DCDC converter normally works according to the self state and the instruction sent by the VCU of the vehicle control unit. And if the VCU of the vehicle control unit does not receive the message sent by the DCDC converter in 3S after the BMS module feeds back the attraction state of the main negative relay, judging that the DCDC converter is failed to wake up, and reporting the fault.

A6, when the DCDC converter normally works, the state of the DCDC converter is detected, whether the DCDC converter has self faults or not, whether the high-voltage input end is overvoltage, overcurrent, undervoltage or undercurrent or not, and any problem exists, the DCDC converter stops working and feeds back the state.

And A7, if the DCDC converter has no fault, stopping working and feeding back the state after receiving a DCDC enable stop instruction issued by the VCU of the vehicle control unit.

Second, as shown in fig. 3 of the drawings, the ac charging state wake-up sub-process includes the following steps:

b1, after inserting a gun into an alternating-current charging gun, the alternating-current charging gun is connected with an alternating-current interface, an OBC (on-board battery charger) receives a 220V alternating-current signal through a slow-charging socket and is awakened and then stands by, meanwhile, the alternating-current interface sends a connection detection CC signal to a VCU (vehicle control unit) through a CC signal hard wire, the VCU receives the connection detection CC signal and is awakened for self-checking, the VCU self-checks whether a fault exists or not, the fault is directly reported to an instrument, awakening of other electric devices is stopped, and the VCU does not perform next-step action.

B2, the VCU of the vehicle controller wakes up the BMS module in the power battery pack through a hard-line signal, the BMS module self-checks the relevant information of the power battery pack after waking up, the VCU of the vehicle controller directly feeds back the VCU of the vehicle controller and stops working when a fault occurs, the VCU of the vehicle controller reports an instrument, and the VCU of the vehicle controller feeds back a normal state to the VCU of the vehicle controller when no fault occurs.

B3, the VCU sends a main negative relay pull-in instruction after receiving BMS module feedback information in the power battery pack, the BMS module pulls in a main negative relay in the negative pole of the power battery pack after receiving the instruction and feeds back a pull-in state to the VCU, and if the BMS module feeds back the pull-in failure of the main negative relay, the fault information is fed back to the VCU of the vehicle controller and stops working.

B4, after the main negative relay of the power battery pack is attracted, the main negative relay in the negative electrode of the power battery pack is attracted at the moment, 300VDC is connected to the positive electrode of the high-voltage input end of the vehicle-mounted DCDC converter through the main positive copper bar and the DCDC fuse on the high-voltage distribution box PDU, the negative electrode of the high-voltage input end of the DCDC converter is connected to the main negative copper bar inside the high-voltage distribution box PDU and is connected to the positive electrode of the power battery pack to form a loop, the high-voltage input end of the vehicle-mounted DCDC converter detects 300VDC to be awakened and enters a standby state, and relevant DC-DC information is sent to a whole vehicle CAN through a CAN message.

B5, the VCU of the vehicle controller starts to detect whether a message sent by the DCDC converter is received in the CAN of the vehicle after receiving the attraction state of the main negative relay fed back by the BMS module of the power battery pack, the VCU of the vehicle controller judges that the DCDC converter is successfully awakened when the detection time of the VCU of the vehicle controller is 3S and the message sent to the DCDC converter within 3S judges that the DCDC converter is successfully awakened, a working voltage and enabling state instruction is sent to the DCDC converter, and the DCDC converter normally works according to the self state and the instruction sent by the VCU of the vehicle controller. And if the VCU of the vehicle control unit does not receive the message sent by the DCDC converter in 3S after the BMS module feeds back the attraction state of the main negative relay, judging that the DCDC converter is failed to wake up, and reporting the fault.

And B6, when the DCDC converter normally works, detecting the self state, judging whether self faults exist, judging whether the high-voltage input end is overvoltage, overcurrent, undervoltage or undercurrent, stopping working and feeding back the state when any problem exists.

And B7, if the DCDC converter has no fault, stopping working and feeding back the state after receiving a DCDC enable stop instruction issued by the VCU of the vehicle control unit.

Third, as shown in fig. 4 of the drawings, the dc charging state wake-up sub-process includes the following steps:

c1, connecting the direct-current charging gun with a direct-current interface after inserting the direct-current charging gun, awakening a Vehicle Control Unit (VCU) through a CC2 signal hard line, awakening the VCU after receiving a connection detection CC2 signal to perform self-checking, automatically checking whether a fault exists in the VCU, directly reporting to an instrument when the fault exists, stopping awakening other electric devices, and performing the next action when the fault does not exist.

C2, the VCU of the vehicle controller wakes up the BMS module in the power battery pack through a hard-line signal, the BMS module wakes up and then self-checks the relevant information of the power battery pack, when a fault occurs, the VCU of the vehicle controller is directly fed back to the VCU of the vehicle controller and stops working, the VCU of the vehicle controller reports an instrument, and when no fault occurs, the normal state is fed back to the VCU of the vehicle controller.

C3, after receiving BMS module feedback information in the power battery pack, the VCU of the vehicle control unit issues a main negative relay actuation instruction, the BMS module actuates a main negative relay in the negative pole of the power battery pack after receiving the instruction and feeds back an actuation state to the VCU of the vehicle control unit, and if the BMS module feedbacks the main negative relay actuation failure, the fault information is fed back to the VCU of the vehicle control unit and stops working.

C4, after the main negative relay of the power battery pack is attracted, the main negative relay in the negative pole of the power battery pack is attracted at the moment, 300VDC is connected to the positive pole of the high-voltage input end of the vehicle-mounted DCDC converter through the main positive copper bar and the DCDC fuse on the high-voltage distribution box PDU, the negative pole of the high-voltage input end of the DCDC converter is connected to the main negative copper bar inside the high-voltage distribution box PDU and is connected to the positive pole of the power battery pack to form a loop, the high-voltage input end of the vehicle-mounted DCDC converter detects 300VDC to be awakened and enters a standby state, and relevant DC-DC information is sent to a whole vehicle CAN through a CAN message.

C5, the VCU of the vehicle controller starts to detect whether a message sent by the DCDC converter is received in the CAN of the vehicle after receiving the attraction state of the main negative relay fed back by the BMS module of the power battery pack, the VCU of the vehicle controller judges that the DCDC converter is successfully awakened when the detection time of the VCU of the vehicle controller is 3S and the message sent to the DCDC converter within 3S judges that the DCDC converter is successfully awakened, a working voltage and enabling state instruction is sent to the DCDC converter, and the DCDC converter normally works according to the self state and the instruction sent by the VCU of the vehicle controller. And if the VCU of the vehicle control unit does not receive the message sent by the DCDC converter in 3S after the BMS module feeds back the attraction state of the main negative relay, judging that the DCDC converter is failed to wake up, and reporting the fault.

When the C6 DCDC converter works normally, the state of the converter is detected, whether the converter has self faults or not, whether the high-voltage input end is overvoltage, overcurrent, undervoltage or undercurrent or not, and any problem exists, the converter stops working and feeds back the state.

And C7, if the DCDC converter has no fault, stopping working and feeding back the state after receiving a DCDC enable stop instruction issued by the VCU of the vehicle controller.

Based on the same inventive concept as the method embodiment, the embodiment of the application provides a pure electric vehicle-mounted DCDC awakening device, which comprises a normal power-on state awakening submodule;

the normal power-on state awakening sub-module is also used for controlling the whole vehicle controller to awaken a BMS module in the power battery pack, the BMS module carries out self-detection on the power battery pack, and if no fault exists, normal information of the power battery state is fed back to the whole vehicle controller;

the normal power-on state awakening submodule is also used for controlling the whole vehicle controller to issue a main negative relay pull-in instruction based on the power battery state normal information, the BMS module responds to the main negative relay pull-in instruction, pulls in a main negative relay in the negative pole of the power battery pack and feeds back the pull-in state to the whole vehicle controller;

and the normal power-on state awakening submodule is also used for judging that the awakening is successful if the whole vehicle CAN receives the first DC-DC information within preset judging time, and otherwise, judging that the awakening is failed.

It should be noted that 300VDC in the embodiment of the present application is a specific value example of a preset dc voltage threshold range, and actually, when it is detected that the dc voltage value is in the preset dc voltage threshold range, the corresponding operation can be performed, and is not limited to 300VDC only.

the alternating current charging state awakening sub-module is also used for controlling the whole vehicle controller to carry out self-checking whether a fault exists or not, if the fault does not exist, the alternating current charging state awakening sub-process is continuously executed, otherwise, the alternating current charging state awakening sub-process is terminated;

the alternating current charging state awakening sub-module is also used for controlling the whole vehicle controller to awaken a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, normal information of the power battery state is fed back to the whole vehicle controller;

Further, the device further comprises a direct current charging state awakening submodule;

and the direct current charging state awakening sub-module is further used for judging that the awakening is successful if the whole vehicle CAN receives the third DC-DC information within a preset judgment time, and otherwise, judging that the awakening is failed.

Further, the device also comprises a DCDC converter self-checking module;

and the negative electrode of the low-voltage storage battery is connected with the negative electrode output end of the DCDC converter. .

It should be noted that, the technical problems, technical means and technical effects corresponding to the pure electric vehicle-mounted DCDC wake-up device provided in the embodiment of the present application are similar to the principle of the pure electric vehicle-mounted DCDC wake-up method in a principle level.

It is noted that, in this application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The above are merely exemplary embodiments of the present application and are intended to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The vehicle-mounted DCDC awakening method for the pure electric vehicle is characterized by comprising a normal power-on state awakening sub-process, wherein the normal power-on state awakening sub-process comprises the following steps:

2. The pure electric vehicle on-board DCDC wake-up method according to claim 1, further comprising an AC charging state wake-up sub-process, said AC charging state wake-up sub-process comprising the steps of:

after a main negative relay of the power battery pack is closed, a high-voltage input end of the vehicle-mounted DCDC converter is awakened and enters a standby state, and second preset DC-DC information related to DC-DC is sent to a finished vehicle CAN;

if the whole vehicle CAN receives the second DC-DC information within the preset judgment time, the whole vehicle CAN judges that the awakening is successful, otherwise, the whole vehicle CAN judges that the awakening is failed.

3. The pure electric vehicle-mounted DCDC wake-up method according to claim 1, characterized in that said method further comprises a DC charging state wake-up sub-process, said DC charging state wake-up sub-process comprising the steps of:

4. The pure electric vehicle on-board DCDC wake-up method according to claim 1, characterized in that said method further comprises the steps of:

5. The pure electric vehicle-mounted DCDC awakening method according to claim 1, characterized in that:

a main negative relay is arranged in the power battery pack and is connected to the negative electrode of the power battery pack, the negative electrode of the power battery pack is connected with the main negative end and the negative end of a high-voltage distribution box PDU, and the main negative end and the negative end of the high-voltage distribution box PDU are connected with the negative input end of the DCDC converter;

6. A pure electric vehicle-mounted DCDC awakening device is characterized by comprising an awakening submodule in a normal power-on state;

7. The on-board DCDC wake-up device of a pure electric vehicle of claim 6, further comprising an AC charging state wake-up sub-module;

the alternating current charging state awakening submodule is also used for controlling a high-voltage input end of the vehicle-mounted DCDC converter to be awakened and enter a standby state after a main negative relay of the power battery pack is closed, and sending preset second DC-DC information related to DC-DC to a finished vehicle CAN;

and the alternating current charging state awakening sub-module is further used for judging that the awakening is successful if the whole vehicle CAN receives the second DC-DC information within a preset judgment time, and otherwise, judging that the awakening is failed.

8. The vehicle-mounted DCDC wake-up device of the pure electric vehicle of claim 6, characterized in that said device further comprises a DC charging state wake-up sub-module;

the direct-current charging state awakening sub-module is used for connecting a direct-current interface after a direct-current charging gun is inserted into the direct-current charging gun and awakening the whole vehicle controller based on the direct-current interface;

the direct current charging state awakening sub-module is also used for controlling the whole vehicle controller to awaken a BMS module in the power battery pack, the BMS module self-checks the power battery pack, and if no fault exists, normal information of the power battery state is fed back to the whole vehicle controller;

the direct current charging state awakening submodule is also used for controlling a high-voltage input end of the vehicle-mounted DCDC converter to be awakened and enter a standby state after a main negative relay of the power battery pack is closed, and sending preset third DC-DC information related to DC-DC to a finished vehicle CAN;

9. The on-board DCDC wake-up device of the pure electric vehicle of claim 6, wherein the device further comprises a DCDC converter self-checking module;

10. The pure electric vehicle-mounted DCDC wake-up device of claim 6, characterized in that: