CN112977089A - High-voltage discharge method and device, vehicle control unit and new energy electric vehicle - Google Patents
High-voltage discharge method and device, vehicle control unit and new energy electric vehicle Download PDFInfo
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- CN112977089A CN112977089A CN202110265413.2A CN202110265413A CN112977089A CN 112977089 A CN112977089 A CN 112977089A CN 202110265413 A CN202110265413 A CN 202110265413A CN 112977089 A CN112977089 A CN 112977089A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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Abstract
The application discloses high-pressure discharge method, device, vehicle control unit and new energy electric automobile, wherein the method comprises the following steps: detecting whether a control switch of the power battery is disconnected; when the control switch of the power battery is detected to be disconnected, whether a motor controller and/or a driving motor is in failure is detected; when no fault is detected, the motor controller is used for controlling the driving motor to work, and meanwhile, one or more high-voltage loads in the high-voltage loop are controlled to work so as to discharge residual electric quantity in the high-voltage loop of the new energy electric automobile together, and when the fault is detected, one or more high-voltage loads in the high-voltage loop are controlled to work. Therefore, the technical problems that in the prior art, only the driving motor is used for pressure relief, once the driving motor fails, only the pressure relief resistor can be used for passive pressure relief, even the pressure relief cannot be carried out, the pressure relief cannot be guaranteed in time, the safety is reduced and the like are solved.
Description
Technical Field
The application relates to the technical field of new energy vehicles, in particular to a high-pressure discharge method and device of a new energy electric vehicle, a vehicle control unit and the new energy electric vehicle.
Background
At present, a high-voltage system of a new energy electric vehicle generally adopts a parallel connection structure, and mainly comprises a power battery pack, an electric drive system, a DCDC (Direct Current, DCDC voltage converter), an electric air conditioner compressor, a PTC (PTC Heater), a high-voltage junction box, a vehicle-mounted charging system and the like. In the whole high-voltage circuit, after the high-voltage relay is disconnected, the residual electric quantity in the high-voltage circuit is usually stored in the motor controller, and the high-voltage system adopts a parallel structure to cause that the electric shock risk can be caused when the high-voltage system touches any position.
In the related art, after the high-voltage relay is disconnected, the electric quantity stored in a bus capacitor of the motor controller is quickly consumed by utilizing the heating of a motor winding so as to release the pressure, namely, the high-voltage release. However, once the MCU (Motor Controller Unit) or the Motor fails, active pressure relief cannot be realized, and only passive pressure relief can be performed through the pressure relief resistor, and the time for passive pressure relief is long, so that pressure relief cannot be performed in time, and the electric shock hidden danger still exists, and the safety cannot be guaranteed.
Content of application
The application provides a high-voltage discharge method and device of a new energy electric automobile, a vehicle control unit and the new energy electric automobile, and aims to solve the technical problems that in the related art, only a driving motor is used for pressure discharge, once the driving motor fails, only a pressure discharge resistor can be used for passive pressure discharge, even pressure discharge cannot be carried out, timely pressure discharge cannot be guaranteed, safety is reduced and the like.
The embodiment of the first aspect of the application provides a high-pressure discharge method for a new energy electric automobile, which comprises the following steps: detecting whether a control switch of the power battery is disconnected; when the control switch of the power battery is detected to be disconnected, detecting whether a motor controller and/or a driving motor are in failure; when no fault is detected, the motor controller is utilized to control the driving motor to work, and simultaneously, one or more high-voltage loads in the high-voltage loop are controlled to work so as to discharge the residual electric quantity in the high-voltage loop of the new energy electric automobile together, and when the fault is detected, one or more high-voltage loads in the high-voltage loop are controlled to work.
Further, the high-voltage load includes an electric drive system, a DCDC voltage converter, an electric air conditioner compressor and a heating system, and before controlling one or more high-voltage loads in the high-voltage loop to work, the method of the embodiment of the present application further includes: obtaining a current state of the one or more high voltage loads; judging whether the current state of the one or more high-voltage loads meets a discharge condition; and if the current state of the one or more high-voltage loads is judged to meet the relief condition, allowing the one or more high-voltage loads to work.
Further, the method of the embodiment of the present application further includes: detecting the current voltage of the high-voltage loop; and if the current voltage is less than a first safety threshold value, controlling the one or more high-voltage loads to stop working.
Further, the method of the embodiment of the present application further includes: and when the one or more high-voltage loads stop working and the current voltage is smaller than a second safety threshold value, controlling the motor controller and the driving motor to stop working, wherein the second safety threshold value is smaller than the first safety threshold value.
Alternatively, the first safety threshold may be 60V, and the second safety threshold may be 30V.
The embodiment of the second aspect of this application provides a new forms of energy electric automobile's high pressure relief device, includes: the first detection module is used for detecting whether a control switch of the power battery is disconnected; the second detection module is used for detecting whether the motor controller and/or the driving motor are in failure or not when the control switch of the power battery is detected to be disconnected; the first control module is used for controlling one or more high-voltage loads in a high-voltage loop to work when the motor controller is used for controlling the driving motor to work when no fault is detected, so that residual electric quantity in the high-voltage loop of the new energy electric automobile is discharged together, and controlling one or more high-voltage loads in the high-voltage loop to work when the fault is detected.
Further, the high-voltage load includes electric drive system, DCDC voltage converter, electric air conditioner compressor and heating system, and the device of this application embodiment still includes: the acquisition module is used for acquiring the current state of one or more high-voltage loads in the high-voltage circuit before controlling the one or more high-voltage loads to work; the judging module is used for judging whether the current state of the one or more high-voltage loads meets the discharge condition or not; and the allowing module is used for allowing the one or more high-voltage loads to work when the current state of the one or more high-voltage loads is judged to meet the relief condition.
Further, the device of this application embodiment still includes: the third detection module is used for detecting the current voltage of the high-voltage loop; the second control module is used for controlling the one or more high-voltage loads to stop working when the current voltage is smaller than a first safety threshold value; and the third control module is used for controlling the motor controller and the driving motor to stop working when the one or more high-voltage loads stop working and the current voltage is smaller than a second safety threshold value, wherein the second safety threshold value is smaller than the first safety threshold value, the first safety threshold value can be 60V, and the second safety threshold value can be 30V.
According to a third aspect of the application, the vehicle control unit comprises the high-pressure relief device of the new energy electric vehicle.
An embodiment of a fourth aspect of the present application provides a new energy electric vehicle, which includes the vehicle control unit.
The auxiliary pressure relief is added on the basis of pressure relief of the driving motor, when the driving motor has no fault, the pressure relief of the driving motor and the auxiliary pressure relief work simultaneously, the pressure relief time can be effectively shortened, the pressure relief efficiency is improved, the electric shock risk is reduced, the safety is ensured, when the driving motor has a fault, the residual electric quantity in a high-voltage loop is timely released through auxiliary pressure relief, the problem that the pressure can only be passively released or even can not be released when the driving motor has a fault is effectively avoided, the timely pressure relief is ensured, and the safety is improved. Therefore, the technical problems that in the prior art, only the driving motor is used for pressure relief, once the driving motor fails, only the pressure relief resistor can be used for passive pressure relief, even the pressure relief cannot be carried out, the pressure relief cannot be guaranteed in time, the safety is reduced and the like are solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a bleed-off strategy of a new energy electric vehicle provided in the related art;
fig. 2 is a schematic flow chart of a high-pressure discharge method of a new energy electric vehicle according to an embodiment of the application
FIG. 3 is a schematic diagram of a new energy electric vehicle bleeding strategy provided according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a high-pressure bleeding method of a new energy electric vehicle according to an embodiment of the present application;
fig. 5 is an example diagram of a high-pressure relief device of a new energy electric vehicle according to an embodiment of the application.
Description of reference numerals:
k0 denotes a high-voltage positive relay, K1 denotes a precharge relay, K2 denotes a high-voltage negative relay, and r0 denotes a precharge resistor.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
With the strong support of the country for new energy automobiles and the development of the trend of the era, the market occupancy of new energy automobiles is gradually increased, so that the requirements for new energy automobiles are also increased, the environment protection and energy saving are required, and the safety performance is also fully ensured. At present, the rated voltage of a high-voltage system of a new energy vehicle type reaches more than 330V, the highest voltage is basically more than 400V, and even the highest voltage of part of vehicle types reaches more than 600V. The safety of the electric automobile requires that the DC voltage of the B-level voltage circuit must be less than 60V, and the electric automobile has a few hundred volts of voltage at all, which can cause serious injury to human bodies. Therefore, it is necessary to design a high-efficiency and safe high-voltage system, which can discharge the loop voltage of the high-voltage system to below the safe voltage before the human body touches the charged high-voltage part.
As shown in fig. 1, in the power-off process of the whole vehicle, the vehicle controller sends an instruction to the battery management system, and the battery management system controls the high-voltage relay to be switched off according to the instruction, wherein the battery management system switches off the negative relay after switching off the positive relay, and sends the state of the relay to the whole vehicle network in real time. After receiving the relay disconnection information, the vehicle control unit detects whether the electric driving system has a fault, and if the electric driving system has no fault, the electric driving system is instructed to carry out high-voltage discharge (as shown by an arrow in the figure); and if the fault occurs, the active discharging is not carried out. However, as described in the above-mentioned background art, there is a problem that the pressure relief is not timely performed when the driving motor fails, and the safety is lowered.
The high-pressure discharge method and device of the new energy electric vehicle, the vehicle control unit and the new energy electric vehicle according to the embodiment of the application are described below with reference to the accompanying drawings. Aiming at the technical problems that in the related technology mentioned in the background technology center, only the driving motor is used for pressure relief, once the driving motor fails, only the pressure relief resistor can be used for passive pressure relief, even the pressure relief cannot be carried out, so that the timely pressure relief cannot be ensured, the safety is reduced and the like, the application provides a high-pressure relief method of a new energy electric vehicle, in the method, auxiliary pressure relief is added on the basis of pressure relief of the driving motor, when the driving motor has no fault, the pressure relief of the driving motor and the auxiliary pressure relief work simultaneously, can effectively reduce the pressure relief time, improve the pressure relief efficiency, reduce the electric shock risk and ensure the safety, and when the driving motor fails, residual electric quantity in the high-voltage loop is timely released through auxiliary pressure release, the problem that the pressure can only be passively released or even can not be released when a driving motor breaks down is effectively avoided, the timely pressure release is guaranteed, and the safety is improved. Therefore, the technical problems that in the related art, only the driving motor is used for discharging, once the driving motor breaks down, only the discharging resistor can be used for discharging passively, even the discharging cannot be carried out, the timely discharging cannot be guaranteed, and the safety is reduced are solved.
Specifically, fig. 2 is a schematic flow chart of a high-pressure bleeding method of a new energy electric vehicle according to an embodiment of the present application.
As shown in fig. 2, the high-pressure discharge method of the new energy electric vehicle includes the following steps:
in step S101, it is detected whether the control switch of the power battery is turned off.
As a possible implementation manner, the embodiment of the present application may detect whether the control switch is turned off according to the turn-off and turn-on signals generated by the control switch; as another possible implementation manner, the embodiment of the application may further detect whether the control switch is turned off by setting a detection circuit. Therefore, the present application may detect whether the control switch is turned off in various ways, which are only examples and are not limited in detail.
The control switch may be a high-voltage relay, which is an electric appliance that causes a controlled amount to change in a predetermined step in an electric output circuit when a change in an input amount (excitation amount) of a high-voltage circuit meets a predetermined requirement. In this embodiment, taking the high-voltage relay as an example of the control switch, the high-voltage relay includes a positive relay for disconnecting the battery pack and a negative relay for disconnecting the battery pack, when disconnecting, the positive relay is disconnected first, then the negative relay is disconnected, and when it is detected that both the positive relay and the negative relay are disconnected, it is determined that the high-voltage relay of the power battery is disconnected.
In step S102, upon detecting that the control switch of the power battery is turned off, it is detected whether the motor controller and/or the driving motor is malfunctioning.
It can be understood that when the control switch of the power battery is turned off, since the amount of electricity remaining in the entire high-voltage circuit is generally stored in the motor controller, it is necessary to further detect whether the motor controller and/or the driving motor is faulty, so as to respectively perform different pressure relief strategies, wherein the different pressure relief strategies performed according to whether the fault is faulty will be described in detail in step S103, and will not be described herein too much.
As a possible implementation manner, the embodiment of the application may detect whether a fault occurs according to state information fed back by the motor controller and the driving motor, where the state information includes fault information, and when the state information is the fault information, the fault is determined; as another possible implementation manner, the embodiment of the application may further detect whether the motor controller and the driving motor are faulty by providing a detection circuit. Therefore, the embodiment of the present application may detect whether the motor controller and the driving motor are faulty in various ways, which are only examples and are not limited in detail.
In step S103, when no fault is detected, the motor controller is used to control the driving motor to operate, and at the same time, one or more high-voltage loads in the high-voltage circuit are controlled to operate, so as to discharge the residual electric quantity in the high-voltage circuit of the new energy electric vehicle together, and when a fault is detected, one or more high-voltage loads in the high-voltage circuit are controlled to operate.
It can be understood that auxiliary pressure relief is added on the basis of pressure relief of the driving motor in the embodiment of the application, and when the driving motor is free of faults, the pressure relief of the driving motor and the auxiliary pressure relief work simultaneously, so that the bus voltage can be more quickly relieved to be below the safe voltage; and when the driving motor can not release the pressure, the pressure release is assisted through one or more high-voltage loads in the high-voltage loop, so that the problem that the driving motor can only release the pressure passively or even can not release the pressure when in failure is effectively avoided, the timely pressure release is ensured, and the safety is improved.
It should be noted that, since the auxiliary pressure relief is active pressure relief and can ensure timely pressure relief compared with passive pressure relief, a pressure relief resistor may not be provided in this embodiment to reduce the pressure relief cost. Certainly, also can set up pressure release resistor in this application embodiment, carry out dual pressure release guarantee through supplementary pressure release and passive pressure release to when supplementary pressure release trouble, can carry out passive pressure release, guarantee the reliability of pressure release, very high security. Therefore, whether the voltage relief resistor is arranged or not can be selected according to the actual voltage relief requirement, and the method is not particularly limited herein.
In this embodiment, as shown in fig. 3, the high-voltage load may include an electric drive system, a DCDC voltage converter, an electric air conditioner compressor, and a heating system, and the embodiment of the present application may select the high-voltage load in which the high-voltage circuit operates in various ways, which is not specifically limited herein.
As a possible implementation manner, before controlling one or more high-voltage loads in the high-voltage circuit to work, the method further comprises the following steps: obtaining a current state of one or more high voltage loads; judging whether the current state of one or more high-voltage loads meets the discharge condition; and if the current state of the one or more high-voltage loads meets the relief condition, allowing the one or more high-voltage loads to work.
The current state of the high-voltage load can comprise a non-fault state and a fault state, when the current state is the non-fault state, the condition of discharging is determined to be met, otherwise, the condition of discharging is determined not to be met, the high-voltage load capable of working is determined, therefore, after the high-voltage relay is disconnected, whether the high-voltage relay is in fault or not can be judged according to the state of each high-voltage load, the high-voltage load without the fault is controlled to discharge voltage, and the reliability of pressure discharging is improved.
As another possible implementation manner, before controlling one or more high-pressure loads in the high-pressure circuit to work, the embodiment of the present application may preset the high-pressure load participating in the bleeding, for example, the high-pressure load participating in the bleeding is set as: when the DCDC voltage converter, the electric air-conditioning compressor and the heating system are used for discharging, the electric drive system, the DCDC voltage converter, the electric air-conditioning compressor and the heating system are simultaneously controlled to discharge residual electric quantity in the high-voltage loop together so as to improve the discharging efficiency; for another example, the high-pressure load participating in the relief is set as follows: and the DCDC voltage converter controls the electric drive system and the DCDC voltage converter to discharge the residual electric quantity in the high-voltage loop together when the DCDC voltage converter performs the discharge so as to simplify the control strategy. And if the preset setting is that the high-voltage load participating in the discharge has a fault, controlling the high-voltage load with the fault not to be discharged.
In some embodiments, the method of embodiments of the present application further comprises: detecting the current voltage of the high-voltage loop; and if the current voltage is less than the first safety threshold value, controlling one or more high-voltage loads to stop working.
The first safety threshold may be 60V or 50V, and may be set according to actual conditions, and is not specifically limited herein. Taking the first safety threshold as 60V as an example, when the monitoring bus voltage is discharged to below 60V, the high-voltage load participating in the discharge is controlled to exit the active discharge, and since the residual electric quantity in the high-voltage loop is already within the safety range, the high-voltage load can be controlled to stop the discharge, so as to reduce the energy consumption of the active discharge.
In some embodiments, when the one or more high voltage loads stop operating and the present voltage is less than a second safety threshold, the motor controller and the drive motor are controlled to stop operating, wherein the second safety threshold is less than the first safety threshold.
It can be understood that, when the current voltage is less than the first safety threshold, in order to avoid the electric shock hazard that the residual electric quantity still may be generated, the embodiment of the application further sets the second safety threshold, so that when the current voltage is less than the first safety threshold and is greater than the second safety threshold, the high-voltage discharge is continuously performed through the driving motor, and when the current voltage is less than the second safety threshold, the motor controller and the driving motor are controlled to stop working, so that the safety and reliability of the discharge are further ensured. The second safety threshold may be 30V or 20V, and may be set according to actual conditions, and is not specifically limited herein.
The high-pressure relief method of the new energy electric vehicle is further described below by a specific embodiment, and as shown in fig. 4, the high-pressure relief method includes the following steps:
step S1, the BMS (Battery Management System) disconnects the high-voltage relay and feeds back the disconnection state of the high-voltage relay to the CAN network of the whole vehicle;
step S2, a VCU (vehicle control unit) receives the high-voltage relay disconnection information sent by the BMS through a vehicle CAN network;
step S3, the high-voltage load feeds back self state information in real time, wherein the state information comprises a fault state, a non-fault state and the like, and the high-voltage load comprises an electric drive system, a DCDC voltage converter, an electric air conditioner compressor and a heating system;
step S4, the VCU receives the state information of all the high voltage loads, if the high voltage loads are in a non-fault state, the step S5 is executed, otherwise, the step S7 is executed;
step S5, the VCU sends a working instruction to the fault-free high-voltage load to control the fault-free high-voltage load to carry out voltage relief;
step S6, judging whether the bus voltage is lower than 60V, if yes, executing step S7, otherwise executing step S5;
and step S7, stopping high-pressure relief of the high-pressure load, and ending the high-pressure relief.
According to the high-pressure releasing method of the new energy electric automobile, auxiliary pressure releasing is added on the basis of pressure releasing of the driving motor, when the driving motor is free of faults, the pressure releasing of the driving motor and the auxiliary pressure releasing work simultaneously, the pressure releasing time can be effectively reduced, the pressure releasing efficiency is improved, the electric shock risk is reduced, the safety is guaranteed, when the driving motor fails, residual electric quantity in a high-pressure loop can be timely released through the auxiliary pressure releasing, the problem that the pressure releasing can only be passively carried out or even cannot be carried out when the driving motor fails is effectively avoided, the timely pressure releasing is guaranteed, and the safety is improved.
Next, a high-pressure relief device of a new energy electric vehicle according to an embodiment of the present application is described with reference to the drawings.
Fig. 5 is a block schematic diagram of a high-pressure relief device of a new energy electric vehicle according to an embodiment of the present application.
As shown in fig. 5, the high pressure relief device 10 of the new energy electric vehicle includes: a first detection module 100, a second detection module 200, and a first control module 300.
The first detection module 100 is configured to detect whether a control switch of the power battery is turned off; the second detection module 200 is configured to detect whether the motor controller and/or the driving motor are/is in failure when detecting that the control switch of the power battery is turned off; the first control module 300 is configured to control one or more high-voltage loads in the high-voltage circuit to work while controlling the driving motor to work by the motor controller when no fault is detected, so as to discharge the residual electric quantity in the high-voltage circuit of the new energy electric vehicle together, and control one or more high-voltage loads in the high-voltage circuit to work when a fault is detected.
Further, the high-voltage load includes an electric drive system, a DCDC voltage converter, an electric air conditioning compressor, and a heating system, and the apparatus 10 of the embodiment of the present application further includes: the device comprises an acquisition module, a judgment module and an allowance module. The acquisition module is used for acquiring the current state of one or more high-voltage loads before controlling the one or more high-voltage loads in the high-voltage circuit to work; the judging module is used for judging whether the current state of one or more high-voltage loads meets the discharge condition or not; and the permission module is used for permitting the one or more high-voltage loads to work when the current state of the one or more high-voltage loads meets the relief condition.
Further, the apparatus 10 of the embodiment of the present application further includes: the device comprises a third detection module and a third control module. The third detection module is used for detecting the current voltage of the high-voltage loop; the second control module is used for controlling one or more high-voltage loads to stop working when the current voltage is smaller than the first safety threshold value; and the third control module is used for controlling the motor controller and the driving motor to stop working when one or more high-voltage loads stop working and the current voltage is smaller than a second safety threshold value, wherein the second safety threshold value is smaller than the first safety threshold value, the first safety threshold value can be 60V, and the second safety threshold value can be 30V.
It should be noted that the above explanation of the embodiment of the high-pressure relief method for the new energy electric vehicle is also applicable to the high-pressure relief device for the new energy electric vehicle of the embodiment, and is not repeated here.
According to the high-pressure relief device of new forms of energy electric automobile that this application embodiment provided, supplementary pressure release has been increased on driving motor pressure release basis, when driving motor does not have the trouble, driving motor pressure release and supplementary pressure release simultaneous working, can effectively reduce the pressure release time, improve pressure release efficiency, reduce the risk of electric shock, guarantee the security, and when driving motor trouble, in time release residual electric quantity in the high-pressure return circuit through supplementary pressure release, only can passive pressure release or even the problem of unable pressure release when effectively avoiding driving motor trouble, guarantee in time pressure release, improve the security.
In addition, the embodiment of the application also provides a vehicle control unit, and the system comprises the high-pressure discharge device of the new energy electric vehicle. This vehicle control unit has increased supplementary pressure release on driving motor pressure release basis, when driving motor does not have the trouble, driving motor pressure release and supplementary pressure release simultaneous working can effectively reduce the pressure release time, improve pressure release efficiency, reduce the risk of electric shock, guarantee the security, and when driving motor trouble, through supplementary pressure release in time discharge high-voltage circuit residual electric quantity, can only passively release the problem of unable pressure release even when effectively avoiding driving motor trouble, guarantee in time pressure release, improve the security.
In addition, the embodiment of the application also provides a new energy electric automobile, and the vehicle comprises the whole vehicle controller. This new forms of energy electric automobile, the supplementary pressure release has been increased on driving motor pressure release basis, when driving motor does not have the trouble, driving motor pressure release and supplementary pressure release simultaneous working, can effectively reduce the pressure release time, improve pressure release efficiency, reduce the risk of electric shock, guarantee the security, and when driving motor trouble, through supplementary pressure release residual electric quantity in the high-voltage circuit of in time releasing, can only passively release the problem of pressure release even unable pressure release when effectively avoiding driving motor trouble, guarantee in time the pressure release, the security is improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
Claims (10)
1. A high-pressure discharge method of a new energy electric automobile is characterized by comprising the following steps:
detecting whether a control switch of the power battery is disconnected;
when the control switch of the power battery is detected to be disconnected, detecting whether a motor controller and/or a driving motor are in failure; and
when no fault is detected, the motor controller is utilized to control the driving motor to work, and simultaneously, one or more high-voltage loads in the high-voltage loop are controlled to work so as to discharge the residual electric quantity in the high-voltage loop of the new energy electric automobile together, and when the fault is detected, one or more high-voltage loads in the high-voltage loop are controlled to work.
2. The method of claim 1, wherein the high voltage loads include an electric drive system, a DCDC voltage converter, an electric air conditioning compressor, and a heating system, and further comprising, prior to controlling operation of one or more of the high voltage loads in the high voltage circuit:
obtaining a current state of the one or more high voltage loads;
judging whether the current state of the one or more high-voltage loads meets a discharge condition;
and if the current state of the one or more high-voltage loads is judged to meet the relief condition, allowing the one or more high-voltage loads to work.
3. The method of claim 1, further comprising:
detecting the current voltage of the high-voltage loop;
and if the current voltage is less than a first safety threshold value, controlling the one or more high-voltage loads to stop working.
4. The method of claim 3, further comprising:
and when the one or more high-voltage loads stop working and the current voltage is smaller than a second safety threshold value, controlling the motor controller and the driving motor to stop working, wherein the second safety threshold value is smaller than the first safety threshold value.
5. The method according to claim 3 or 4, characterized in that the first safety threshold is 60V and the second safety threshold is 30V.
6. The utility model provides a new forms of energy electric automobile's high pressure bleeder mechanism which characterized in that includes:
the first detection module is used for detecting whether a control switch of the power battery is disconnected;
the second detection module is used for detecting whether the motor controller and/or the driving motor are in failure or not when the control switch of the power battery is detected to be disconnected; and
the first control module is used for controlling one or more high-voltage loads in a high-voltage loop to work when the motor controller is used for controlling the driving motor to work when no fault is detected, so that residual electric quantity in the high-voltage loop of the new energy electric automobile is discharged together, and controlling one or more high-voltage loads in the high-voltage loop to work when the fault is detected.
7. The apparatus of claim 6, wherein the high voltage load comprises an electric drive system, a DCDC voltage converter, an electric air conditioning compressor, and a heating system, further comprising:
the acquisition module is used for acquiring the current state of one or more high-voltage loads in the high-voltage circuit before controlling the one or more high-voltage loads to work;
the judging module is used for judging whether the current state of the one or more high-voltage loads meets the discharge condition or not;
and the allowing module is used for allowing the one or more high-voltage loads to work when the current state of the one or more high-voltage loads is judged to meet the relief condition.
8. The apparatus of claim 6, further comprising:
the third detection module is used for detecting the current voltage of the high-voltage loop;
the second control module is used for controlling the one or more high-voltage loads to stop working when the current voltage is smaller than a first safety threshold value;
and the third control module is used for controlling the motor controller and the driving motor to stop working when the one or more high-voltage loads stop working and the current voltage is smaller than a second safety threshold value, wherein the second safety threshold value is smaller than the first safety threshold value, the first safety threshold value is 60V, and the second safety threshold value is 30V.
9. A vehicle control unit, comprising: the high-pressure relief device of the new energy electric vehicle as claimed in any one of claims 6 to 8.
10. The utility model provides a new forms of energy electric automobile which characterized in that includes: the vehicle control unit of claim 9.
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