CN107284242B - High-voltage electricity-withdrawing method and device for electric vehicle - Google Patents
High-voltage electricity-withdrawing method and device for electric vehicle Download PDFInfo
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- CN107284242B CN107284242B CN201610200227.XA CN201610200227A CN107284242B CN 107284242 B CN107284242 B CN 107284242B CN 201610200227 A CN201610200227 A CN 201610200227A CN 107284242 B CN107284242 B CN 107284242B
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- electric vehicle
- high voltage
- air conditioner
- compressor
- unloading
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
- B60L1/003—Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3225—Cooling devices using compression characterised by safety arrangements, e.g. compressor anti-seizure means or by signalling devices
Abstract
The invention discloses a high-voltage electricity-withdrawing method and device for an electric vehicle. The method comprises the following steps: receiving a power-off instruction which is sent by a user and indicates that the electric vehicle stops and powers off; sending a compressor unloading instruction to an air conditioner compressor of the electric vehicle in response to the power-off instruction; judging whether the air conditioner compressor is unloaded or not; and when the air conditioner compressor is judged to be unloaded, disconnecting the whole vehicle high voltage of the electric vehicle. Through the technical scheme, the loss of the air-conditioning compressor caused by instant power failure of the air-conditioning compressor running at a high speed is avoided, so that the service life of the air-conditioning compressor is prolonged, the cost of maintenance is reduced, and the driving safety is improved.
Description
Technical Field
The invention relates to the field of electric vehicles, in particular to a high-voltage electricity-withdrawing method and device of an electric vehicle.
Background
The air-conditioning compressor of the electric vehicle is supplied with power by the high voltage of the whole vehicle. At present, when an electric vehicle is parked and powered off, an Air Conditioning Compressor (ACC) is normally powered off immediately, extra abrasion can be caused due to instant power-off when the air conditioning compressor is in a high-speed running state, and a long-term operation can generate huge impact on the air conditioning compressor, so that the service life of the air conditioning compressor is influenced, the cost of user maintenance is increased, and the driving safety of a driver is reduced.
Disclosure of Invention
The invention aims to provide a high-voltage electricity-discharging method and a high-voltage electricity-discharging device for an electric vehicle, which can reduce the abrasion of an air-conditioning compressor.
In order to achieve the above object, the present invention provides a high voltage de-electrifying method for an electric vehicle. The method comprises the following steps: receiving a power-off instruction which is sent by a user and indicates that the electric vehicle stops and powers off; sending a compressor unloading instruction to an air conditioner compressor of the electric vehicle in response to the power-off instruction; judging whether the air conditioner compressor is unloaded or not; and when the air conditioner compressor is judged to be unloaded, disconnecting the whole vehicle high voltage of the electric vehicle.
Optionally, the step of determining whether the air conditioner compressor is unloaded includes any one or more of the following: judging whether the air conditioner compressor is unloaded or not according to the compressor unloading state information of the air conditioner compressor; and judging whether the air conditioner compressor is unloaded or not according to the time length after the compressor unloading instruction is sent.
Optionally, the method further comprises: in response to the power-off command, sending a motor unloading command to a drive motor of the electric vehicle; judging whether the unloading of the driving motor is finished, wherein when the unloading of the air conditioner compressor is finished, the step of disconnecting the whole vehicle high pressure of the electric vehicle comprises the following steps: and when the air conditioner compressor is judged to be unloaded completely and the driving motor is judged to be unloaded completely, the whole vehicle high voltage of the electric vehicle is cut off.
Optionally, the step of determining whether the drive motor is unloaded comprises any one or more of: judging whether the unloading of the driving motor is finished or not according to the motor unloading state information of the driving motor; and judging whether the unloading of the driving motor is finished or not according to the time length after the motor unloading instruction is sent.
Optionally, after the step of disconnecting the full vehicle high voltage of the electric vehicle, the method further includes: initiating sintering detection of a main contactor between the air conditioner compressor and the whole vehicle high voltage; judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering detection; and when the high voltage of the whole electric vehicle is judged to be disconnected, the low-voltage power supply of the air conditioner compressor is disconnected.
Optionally, the method further comprises: and when the whole vehicle high voltage of the electric vehicle is judged to be disconnected, disconnecting the low-voltage power supply of the battery management system of the electric vehicle.
Optionally, the step of judging whether the overall high voltage of the electric vehicle is disconnected according to the sintering detection comprises any one or more of the following steps: judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering state information detected by sintering; and judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the duration after the sintering detection is initiated.
The invention also provides a high-voltage electricity-withdrawing device of the electric vehicle. The device comprises: the receiving module is used for receiving a power-off instruction which is sent by a user and indicates that the electric vehicle stops and powers off; the compressor unloading sending module is used for responding to the power-off instruction and sending a compressor unloading instruction to an air conditioner compressor of the electric vehicle; the compressor judging module is used for judging whether the air conditioner compressor is unloaded; and the high-voltage disconnection module is used for disconnecting the whole vehicle high voltage of the electric vehicle when the air conditioner compressor is judged to be unloaded.
Through the technical scheme, when the parking power-off instruction sent by the user is received, the unloading instruction is sent to the air conditioner compressor, and when the air conditioner compressor is determined to be unloaded, the high voltage of the whole vehicle is cut off. Therefore, the loss of the air-conditioning compressor caused by the instant power failure of the air-conditioning compressor running at a high speed is avoided, the service life of the air-conditioning compressor is prolonged, the maintenance cost is reduced, and the driving safety is improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a high voltage de-energizing method for an electric vehicle provided by an exemplary embodiment;
FIG. 2 is a flow chart illustrating the determination of whether unloading of an air conditioner compressor is complete according to an exemplary embodiment;
FIG. 3 is a flow chart of a high voltage de-energizing method for an electric vehicle provided by another exemplary embodiment;
FIG. 4 is a flow chart illustrating a determination of whether unloading of a drive motor is complete in accordance with an exemplary embodiment;
FIG. 5 is a flow chart of a high voltage de-energizing method for an electric vehicle provided by yet another exemplary embodiment;
FIG. 6 is a flow chart of a high voltage de-energizing method for an electric vehicle provided by yet another exemplary embodiment;
fig. 7 is a block diagram of a high-voltage power-off device of an electric vehicle provided by an exemplary embodiment;
fig. 8 is a block diagram of a high voltage power-off device of an electric vehicle provided by another exemplary embodiment;
fig. 9 is a block diagram of a high voltage power-off device of an electric vehicle provided by yet another exemplary embodiment; and
fig. 10 is a block diagram of a high-voltage power-off device of an electric vehicle according to still another exemplary embodiment.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart of a high-voltage power-off method of an electric vehicle according to an exemplary embodiment. As shown in fig. 1, the method includes the following steps.
In step S11, a power-off command is received from a user to instruct the electric vehicle to stop and power off.
The power-off command is a command for instructing the electric vehicle to stop at a power-off state. For example, when the driver wants to STOP the running electric vehicle, the driver presses a "STOP" key or an "OFF" key on the cab control panel, and then sends a power-OFF command to the electric vehicle.
In step S12, a compressor unloading command is sent to an air conditioner compressor of the electric vehicle in response to the power-off command.
In general, when an electric vehicle receives a power-off command, it immediately cuts off power to various devices including an air conditioner compressor. In the embodiment of the disclosure, when the power-off instruction is received, the power-off is not performed first, but an unloading instruction is sent to the air-conditioning compressor to instruct the air-conditioning compressor to unload the driving power. For example, the operation power of the motor-driven compressor is attenuated at a predetermined speed, that is, the rotation speed at which the air-conditioning compressor is operated is gradually reduced. This removal of drive power can be controlled, for example, by setting and running corresponding software in the relevant components.
In step S13, it is determined whether the unloading of the air conditioner compressor is completed.
The step of determining whether the air conditioner compressor is unloaded may include any one or more of the following: judging whether the air conditioner compressor is unloaded or not according to the compressor unloading state information of the air conditioner compressor; and judging whether the air conditioner compressor is unloaded or not according to the time length after the compressor unloading instruction is sent.
In the former, the air conditioner compressor may periodically send compressor unload state information, which may indicate the current operating conditions of the air conditioner compressor, while the power is unloaded. The compressor unloading status information may include, for example, a current rotational speed of the air conditioner compressor. In this embodiment, whether the air conditioner compressor is unloaded can be determined according to the compressor unloading state information. In addition, the compressor unloading state information itself may indicate a result of determination as to whether the air conditioner compressor is unloaded. In this embodiment, the air conditioner compressor may directly transmit the determination result indicating whether the unloading of the air conditioner compressor is completed.
Whether the air conditioner compressor is unloaded or not can be judged according to the loss degree of the air conditioner compressor when the power is off under the current operation condition. The determination may be based on a preset power threshold or a rotational speed threshold. For example, a threshold value of the rotating speed of the compressor is set, and when the current rotating speed of the compressor is smaller than the threshold value of the rotating speed of the compressor, it can be considered that the air conditioner compressor is not lost when the power is cut off at the current rotating speed, and it can be considered that the unloading of the air conditioner compressor is completed. Otherwise, when the current rotating speed is greater than the rotating speed threshold value of the compressor, the loss of the air conditioner compressor can be caused by the fact that the power is cut off at the current rotating speed. The compressor speed threshold may be greater than zero or equal to zero.
In addition, whether the air conditioner compressor is unloaded can be judged according to the time length after the compressor unloading instruction is sent. That is, a timer may be started after the compressor unloading command is sent, and if the timer reaches a predetermined time period (e.g., 5s), the air conditioner compressor unloading is considered to be completed.
It can be understood that whether the unloading of the air conditioner compressor is completed can also be judged by simultaneously considering the information of the unloading state of the compressor and the time length after the compressor unloading instruction is sent. For example, if the received compressor unloading state information indicates that the air conditioner compressor has been unloaded within a predetermined time period, it is determined that the air conditioner compressor has been unloaded, and if the received compressor unloading state information does not indicate that the air conditioner compressor has been unloaded within the predetermined time period or the compressor unloading state information is not received, it may be considered that the air conditioner compressor has been unloaded when the predetermined time period is reached. Fig. 2 is a flowchart illustrating a method for determining whether unloading of an air conditioner compressor is complete according to an exemplary embodiment.
In step S14, when it is determined that the unloading of the air conditioner compressor is completed, the entire vehicle high voltage of the electric vehicle is turned off.
The air conditioner compressor is provided by the high voltage of the whole vehicle, and in the embodiment, the high voltage of the whole vehicle can be controlled to be disconnected when the air conditioner compressor is judged to be unloaded, for example, by a low voltage management system (BMS). Wherein, the low pressure BMS is used for controlling the high pressure module of whole car.
Through the technical scheme, when the parking power-off instruction sent by the user is received, the unloading instruction is sent to the air conditioner compressor, and when the air conditioner compressor is determined to be unloaded, the high voltage of the whole vehicle is cut off. Therefore, the loss of the air-conditioning compressor caused by the instant power failure of the air-conditioning compressor running at a high speed is avoided, the service life of the air-conditioning compressor is prolonged, the maintenance cost is reduced, and the driving safety is improved.
The driving motor of the electric vehicle is also a device which runs at high speed, and is also supplied with power by the whole vehicle at high voltage. Therefore, in another embodiment of the present disclosure, the high voltage of the whole vehicle can be cut off after the driving motor is unloaded. Fig. 3 is a flowchart of a high-voltage power-off method of an electric vehicle according to another exemplary embodiment. As shown in fig. 3, on the basis of fig. 1, the method may further include the following steps.
In step S15, a motor unloading command is sent to a drive motor of the electric vehicle in response to the power-off command.
In this embodiment, upon receiving the power-off command, an unload command is sent to the drive motor instructing the drive motor to unload power. The unloading of the drive motor can be carried out, for example, directly by switching off the current to the drive motor. This step S15 may be performed simultaneously with step S12, that is, when the power-off command is received, the unloading command is simultaneously sent to the air conditioner compressor and the driving motor, respectively.
In step S16, it is determined whether unloading of the drive motor is completed.
Similarly to the above step S13, the step of determining whether the unloading of the driving motor is completed may include any one or more of the following: judging whether the unloading of the driving motor is finished or not according to the motor unloading state information of the driving motor; and judging whether the unloading of the driving motor is finished or not according to the time length after the motor unloading instruction is sent.
In the former, the drive motor may periodically send unloaded status information while unloaded, which may indicate the current operating conditions of the drive motor. The motor unload state information may include, for example, the current rotational speed of the drive motor. In this embodiment, whether the unloading of the driving motor is completed may be determined according to the motor unloading state information. In addition, the motor unloading state information itself may indicate a determination result of whether the unloading of the drive motor is completed. In this embodiment, the drive motor may directly send the determination result indicating whether the unloading of the drive motor is completed.
For judging whether the unloading of the driving motor is finished, the unloading can be determined according to the loss degree of the driving motor caused by the power failure under the current running condition. The determination may be based on a preset power threshold or a rotational speed threshold. For example, a motor rotation speed threshold is set, and when the current rotation speed of the motor is less than the motor rotation speed threshold, it may be considered that the loss of the driving motor is not caused by the power failure at the current rotation speed, and it may be considered that the unloading of the driving motor is completed. Otherwise, when the current rotating speed is greater than the motor rotating speed threshold value, it can be considered that the loss is caused to the driving motor when the power is cut off at the current rotating speed. The motor speed threshold may be greater than zero or equal to zero.
In addition, whether the unloading of the driving motor is finished can be judged according to the time length after the motor unloading instruction is sent. That is, a timer may be started after the motor unloading command is sent, and if the timer reaches a predetermined time period (for example, 2s), the unloading of the drive motor is considered to be completed.
It can be understood that whether the unloading of the driving motor is completed can also be judged by simultaneously considering the motor unloading state information and the time length after the motor unloading instruction is sent. For example, if the received motor unloading state information indicates that the unloading of the driving motor is completed within a predetermined time period, it is determined that the unloading of the driving motor is completed, and if the received motor unloading state information does not indicate that the unloading of the driving motor is completed within the predetermined time period or the motor unloading state information is not received, it may be determined that the unloading of the air conditioner compressor is completed when the predetermined time period is reached. FIG. 4 is a flow chart illustrating a determination of whether unloading of a drive motor is complete in accordance with an exemplary embodiment.
In this embodiment, the step of turning off the entire vehicle high pressure of the electric vehicle (step S14) may include step S141 when it is determined that the unloading of the air conditioner compressor is completed.
In step S141, when it is determined that the unloading of the air conditioner compressor is completed and it is determined that the unloading of the driving motor is completed, the entire vehicle high voltage of the electric vehicle is turned off.
In the embodiment, the loss of the driving motor caused by the instant power failure of the driving motor running at high speed is avoided, so that the service life of the driving motor is prolonged, the cost of maintenance is reduced, and the driving safety is improved.
Fig. 5 is a flowchart of a high-voltage power-off method of an electric vehicle according to still another exemplary embodiment. As shown in fig. 5, on the basis of fig. 1, after the step of disconnecting the full vehicle high voltage of the electric vehicle (step S14), the method may further include the following steps.
In step S17, a sintering detection of the main contactor between the air conditioner compressor and the vehicle high voltage is initiated.
In the above step S14, the disconnection of the vehicle high voltage has been instructed. But it is also possible that for some reason there is actually no disconnection. And the sintering detection is to sinter the main contactor between the air compressor and the whole vehicle high voltage according to the on-off state of the circuit so as to detect whether the whole vehicle high voltage of the electric vehicle is actually disconnected. The specific steps of the sintering assay are well known to those skilled in the art and will not be described in detail herein.
In step S18, it is determined whether the entire vehicle high voltage of the electric vehicle has been disconnected based on the sintering detection.
Similar to step S13 or step S16 described above, this step S18 may include any one or more of the following: judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering state information detected by sintering; and judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the time length after the sintering detection is initiated.
In the former, sintering state information may be periodically transmitted simultaneously with the sintering inspection, and the sintering state information may indicate the current status of the sintering inspection. In the embodiment, the high voltage of the whole vehicle can be judged to be disconnected according to the sintering state information. In addition, the sintering state information itself may also indicate the result of determination as to whether the high voltage of the entire vehicle has been disconnected. In this embodiment, the determination result indicating whether the high voltage of the entire vehicle has been disconnected may be directly received.
In addition, whether the high voltage of the whole vehicle is disconnected or not can be judged according to the time length after the sintering detection is initiated. That is, a timer may be started after the sintering test is initiated, and if the timer reaches a predetermined time period (e.g., 5s), the vehicle high voltage is considered to be disconnected.
It can be understood that whether the high voltage of the whole vehicle is disconnected or not can be judged by simultaneously considering the sintering state information and the time length after the sintering detection is initiated. For example, if the received sintering state information indicates that the whole vehicle high voltage is disconnected within a predetermined time period, the whole vehicle high voltage is judged to be disconnected, and if the received sintering state information does not indicate that the whole vehicle high voltage is disconnected within the predetermined time period or the sintering state information is not received, the whole vehicle high voltage can be considered to be disconnected when the predetermined time period is reached.
In step S19, when it is determined that the entire vehicle high voltage of the electric vehicle has been disconnected, the low voltage power supply of the air conditioner compressor is disconnected.
The low-voltage power supply of the air-conditioning compressor provides power for a controller of the air-conditioning compressor, and the controller is used for controlling the running state of the air-conditioning compressor and receiving and transmitting external communication information. Disconnecting the low voltage power supply to the air conditioner compressor may generally be accomplished by disconnecting a relay between a BCM (Body Control Module) and the air conditioner compressor. In this embodiment, on the basis of guaranteeing that air condition compressor uninstallation is accomplished, still carried out safety inspection to BMS, protected BMS high-pressure system effectively.
Fig. 6 is a flowchart of a high-voltage power-off method of an electric vehicle according to still another exemplary embodiment. As shown in fig. 6, on the basis of fig. 5, the method may further include the following steps.
In step S20, when it is determined that the entire vehicle high voltage of the electric vehicle has been disconnected, the power supply of the low voltage Battery Management System (BMS) of the electric vehicle is disconnected.
Wherein disconnecting the power supply of the low voltage BMS may generally be achieved by disconnecting a relay between the BCM and the low voltage BMS. In the embodiment, after the high voltage of the whole vehicle is confirmed to be disconnected, the power supply of the low-voltage BMS is disconnected, and the BMS high-voltage system is protected.
The invention also provides a high-voltage electricity-withdrawing device of the electric vehicle. Fig. 7 is a block diagram of a high-voltage power-off device of an electric vehicle according to an exemplary embodiment. As shown in fig. 7, the high voltage de-energizing device 10 of the electric vehicle includes a receiving module 11, a compressor unloading transmitting module 12, a compressor determining module 13, and a high voltage disconnecting module 14.
The receiving module 11 is configured to receive a power-off instruction sent by a user and indicating that the electric vehicle is stopped and powered off.
The compressor unloading sending module 12 is configured to send a compressor unloading instruction to an air conditioner compressor of the electric vehicle in response to the power-off instruction.
The compressor judging module 13 is used for judging whether the air conditioner compressor is unloaded.
The high-voltage disconnection module 14 is used for disconnecting the whole vehicle high voltage of the electric vehicle when the air conditioner compressor is judged to be unloaded.
Optionally, the compressor determination module 13 may include any one or more of the following:
the first judgment submodule is used for judging whether the air conditioner compressor is unloaded or not according to the compressor unloading state information of the air conditioner compressor;
and the second judgment submodule is used for judging whether the air conditioner compressor is unloaded or not according to the time length after the compressor unloading instruction is sent.
Fig. 8 is a block diagram of a high-voltage power-off device of an electric vehicle according to another exemplary embodiment. As shown in fig. 8, on the basis of fig. 7, the apparatus 10 may further include a motor unloading transmitting module 15 and a motor judging module 16.
The motor unloading sending module 15 is configured to send a motor unloading command to a driving motor of the electric vehicle in response to the power-off command.
The motor judgment module 16 is used for judging whether the unloading of the driving motor is finished.
Wherein the high voltage disconnect module 14 may comprise: and a disconnection submodule 141 for disconnecting the entire vehicle high voltage of the electric vehicle when it is determined that the unloading of the air conditioner compressor is completed and it is determined that the unloading of the driving motor is completed.
Alternatively, the motor determination module 16 may include any one or more of the following:
the third judgment submodule is used for judging whether the driving motor is unloaded or not according to the motor unloading state information of the driving motor;
and the fourth judgment submodule is used for judging whether the unloading of the driving motor is finished according to the time length after the motor unloading instruction is sent.
Fig. 9 is a block diagram of a high-voltage power-off device of an electric vehicle according to still another exemplary embodiment. As shown in fig. 9, on the basis of fig. 7, the apparatus 10 may further include an initiating module 17, a high voltage disconnection determining module 18, and a first low voltage disconnection module 19.
The initiating module 17 is used for initiating sintering detection of the main contactor between the air conditioner compressor and the whole vehicle high voltage.
And the high-voltage disconnection judging module 18 is used for judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering detection.
The first low-voltage disconnection module 19 is used for disconnecting the low-voltage power supply of the air conditioner compressor when the whole vehicle high voltage of the electric vehicle is judged to be disconnected.
Fig. 10 is a block diagram of a high-voltage power-off device of an electric vehicle according to still another exemplary embodiment. As shown in fig. 10, on the basis of fig. 9, the device 10 may further comprise a second low voltage disconnection module 20.
The second low-voltage disconnection module 20 is used for disconnecting the low-voltage power supply of the battery management system of the electric vehicle when the whole vehicle high voltage of the electric vehicle is judged to be disconnected.
Optionally, the high voltage disconnection determination module 18 may include any one or more of the following:
the fifth judgment submodule is used for judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering state information of the sintering detection;
and the sixth judgment submodule is used for judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the duration after the sintering detection is initiated.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Through the technical scheme, when the parking power-off instruction sent by the user is received, the unloading instruction is sent to the air conditioner compressor, and when the air conditioner compressor is determined to be unloaded, the high voltage of the whole vehicle is cut off. Therefore, the loss of the air-conditioning compressor caused by the instant power failure of the air-conditioning compressor running at a high speed is avoided, the service life of the air-conditioning compressor is prolonged, the maintenance cost is reduced, and the driving safety is improved.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A high voltage de-energizing method for an electric vehicle, the method comprising:
receiving a power-off instruction which is sent by a user and indicates that the electric vehicle stops and powers off;
in response to the power-down command, sending a compressor unloading command to an air conditioner compressor of the electric vehicle, the unloading command instructing an operating power of the electric compressor to decay at a predetermined speed;
judging whether the air conditioner compressor is unloaded, wherein the unloading of the air conditioner compressor is judged to be completed when the current rotating speed of the air conditioner compressor is less than a compressor rotating speed threshold value;
in response to the power-off command, sending a motor unloading command to a drive motor of the electric vehicle;
judging whether the driving motor is unloaded or not, wherein when the current rotating speed of the driving motor is smaller than a motor rotating speed threshold value, the driving motor is judged to be unloaded;
when the air conditioner compressor is judged to be unloaded completely and the driving motor is judged to be unloaded completely, the whole vehicle high voltage of the electric vehicle is cut off;
initiating sintering detection of a main contactor between the air conditioner compressor and the whole vehicle high voltage;
and judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering detection.
2. The method of claim 1, wherein after the step of disconnecting the full vehicle high voltage of the electric vehicle, the method further comprises:
and when the high voltage of the whole electric vehicle is judged to be disconnected, the low-voltage power supply of the air conditioner compressor is disconnected.
3. The method of claim 1, further comprising:
and when the whole vehicle high voltage of the electric vehicle is judged to be disconnected, disconnecting the low-voltage power supply of the battery management system of the electric vehicle.
4. The method of claim 1, wherein the step of determining whether the overall high voltage of the electric vehicle has been disconnected according to the sintering detection comprises any one or more of:
judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering state information detected by sintering;
and judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the duration after the sintering detection is initiated.
5. A high voltage de-energizing device for an electric vehicle, the device comprising:
the receiving module is used for receiving a power-off instruction which is sent by a user and indicates that the electric vehicle stops and powers off;
a compressor unloading sending module, configured to send a compressor unloading instruction to an air conditioner compressor of the electric vehicle in response to the power-off instruction, where the unloading instruction instructs an operating power of the electric compressor to decay at a predetermined speed;
the compressor judging module is used for judging whether the air conditioner compressor is unloaded or not, wherein the unloading of the air conditioner compressor is judged to be completed when the current rotating speed of the air conditioner compressor is smaller than a compressor rotating speed threshold value;
the motor unloading sending module is used for responding to the power-off instruction and sending a motor unloading instruction to a driving motor of the electric vehicle;
the motor judgment module is used for judging whether the unloading of the driving motor is finished or not, wherein when the current rotating speed of the driving motor is smaller than a motor rotating speed threshold value, the unloading of the driving motor is judged to be finished;
the high-voltage disconnection module is used for disconnecting the whole vehicle high voltage of the electric vehicle when the air conditioner compressor is judged to be unloaded;
the initiating module is used for initiating sintering detection of a main contactor between the air conditioner compressor and the whole vehicle high voltage;
a high voltage disconnection judging module for judging whether the whole vehicle high voltage of the electric vehicle is disconnected according to the sintering detection,
wherein the high voltage disconnect module comprises: and the disconnection submodule is used for disconnecting the whole vehicle high voltage of the electric vehicle when the air conditioner compressor is judged to be unloaded and the driving motor is judged to be unloaded.
6. The apparatus of claim 5, further comprising:
and the first low-voltage disconnection module is used for disconnecting the low-voltage power supply of the air conditioner compressor when the whole vehicle high voltage of the electric vehicle is judged to be disconnected.
7. The apparatus of claim 5, further comprising:
and the second low-voltage disconnection module is used for disconnecting the low-voltage power supply of the battery management system of the electric vehicle when the whole vehicle high voltage of the electric vehicle is judged to be disconnected.
8. The apparatus of claim 5, wherein the high voltage disconnect determination module comprises any one or more of:
the fifth judgment submodule is used for judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the sintering state information of the sintering detection;
and the sixth judgment submodule is used for judging whether the whole vehicle high voltage of the electric vehicle is disconnected or not according to the duration after the sintering detection is initiated.
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| CN108032707B (en) * | 2017-12-29 | 2021-03-02 | 北汽（常州）汽车有限公司 | Power-off control method for air conditioning system of pure electric vehicle |
| CN111823865B (en) * | 2019-04-15 | 2022-01-07 | 比亚迪股份有限公司 | Vehicle power-off method and device and vehicle |
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| DE102006003254A1 (en) * | 2006-01-24 | 2007-07-26 | Robert Bosch Gmbh | Operating method for electrical machine with pulse-controlled inverter in case of disturbance, involves switching electrical machine into de-energizing mode and into short-circuit mode |
| CN102390279A (en) * | 2011-09-21 | 2012-03-28 | 奇瑞汽车股份有限公司 | Safe control loop of electric automobile |
| JP6346397B2 (en) * | 2012-02-03 | 2018-06-20 | 株式会社Ｓｕｂａｒｕ | Vehicle control device |
| CN104656629B (en) * | 2013-11-18 | 2018-01-23 | 比亚迪股份有限公司 | Sintering detection apparatus and method for contactor |
| CN103754115B (en) * | 2014-01-17 | 2017-11-03 | 北京智行鸿远汽车技术有限公司 | Time series management system and method above and below a kind of plug-in hybrid-power automobile high-low pressure |
| CN204774699U (en) * | 2015-02-16 | 2015-11-18 | 北京新能源汽车股份有限公司 | Discharge device of electric automobile's surplus electricity of high -pressure part |
| CN204956360U (en) * | 2015-08-20 | 2016-01-13 | 奇瑞汽车股份有限公司 | Power supply circuit of motor compressor |
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