CN110588435A - High-voltage control system of electric automobile and high-voltage power-on control method thereof - Google Patents
High-voltage control system of electric automobile and high-voltage power-on control method thereof Download PDFInfo
- Publication number
- CN110588435A CN110588435A CN201910894150.4A CN201910894150A CN110588435A CN 110588435 A CN110588435 A CN 110588435A CN 201910894150 A CN201910894150 A CN 201910894150A CN 110588435 A CN110588435 A CN 110588435A
- Authority
- CN
- China
- Prior art keywords
- voltage
- charging
- control
- battery management
- management system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- 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
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a high-voltage control system of an electric automobile and a high-voltage electrifying control method thereof, wherein the system comprises: the battery management system is used for outputting a pre-charging control pulse signal; and the pre-charging system is connected with the first end of the negative relay, the second end of the negative relay and the battery management system respectively, and is used for carrying out chopping control on pre-charging voltage between the first end of the negative relay and the second end of the negative relay according to a pre-charging control pulse signal. The system controls the pre-charging system to carry out chopping control on the pre-charging voltage through the battery management system, can adjust the pre-charging control pulse signal to adjust the pre-charging speed while finishing the pre-charging function, improves the controllability and the intelligence of pre-charging, and reduces the space occupied by the high-voltage control system due to the small volume of the pre-charging system.
Description
Technical Field
The invention relates to the technical field of vehicle engineering, in particular to a high-voltage control system of an electric automobile and a high-voltage electrifying control method thereof.
Background
At present, high-voltage electrification is needed when an electric automobile is started, and pre-charging is generally needed before the high-voltage electrification in order to avoid damage of high-voltage electric equipment such as a motor controller and a relay for controlling the high-voltage electrification and the high-voltage electrification.
In the related art, a pre-charging method is usually performed by connecting a power resistor and a pre-charging relay in parallel at two ends of a main relay for controlling high voltage power-up and power-down, closing the pre-charging relay first when pre-charging power-up is performed, limiting a pre-charging current through the power resistor to avoid damage caused by the pre-charging current, and closing the main relay when the voltage at two ends of a power-using device is close to a high voltage rated voltage and the voltage difference at two ends of the main relay is small to complete pre-charging.
However, the above-mentioned pre-charging method cannot control the pre-charging speed and the charging time, the controllability of the pre-charging is poor, and the space of the battery pack is occupied due to the large volume of the power resistor and the pre-charging relay.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a high voltage control system of an electric vehicle, which outputs a pre-charge control pulse signal through a battery management system to control a pre-charge system to perform chopper control on a pre-charge voltage, and can adjust a pre-charge speed by adjusting the pre-charge control pulse signal while completing a pre-charge function, so that a pre-charge time can be planned according to actual requirements, thereby improving controllability and intelligence of pre-charge, and since the pre-charge system has a smaller volume, the occupied space is reduced, which is beneficial to increase the capacity of an electric vehicle battery pack to improve the endurance mileage.
The second purpose of the invention is to provide a control method for high-voltage power-on of an electric vehicle.
A third object of the invention is to propose a vehicle.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a high voltage control system for an electric vehicle, including: the battery management system is used for outputting a pre-charging control pulse signal; and the pre-charging system is connected with the first end of the negative relay, the second end of the negative relay and the battery management system respectively, and is used for carrying out chopping control on pre-charging voltage between the first end of the negative relay and the second end of the negative relay according to a pre-charging control pulse signal.
The high-voltage control system of the electric automobile provided by the embodiment of the invention outputs the pre-charging control pulse signal through the battery management system to control the pre-charging system to carry out chopping control on the pre-charging voltage, and can adjust the pre-charging speed by adjusting the pre-charging control pulse signal while completing the pre-charging function, so that the pre-charging time can be planned according to actual requirements, the controllability and the intelligence of pre-charging are improved, and the volume of the pre-charging system is smaller, so that the occupied space is reduced, and the capacity of an electric automobile battery pack is increased to improve the endurance mileage.
In addition, the high-voltage control system of the electric automobile of the embodiment of the invention also comprises the following additional technical characteristics:
in one embodiment of the present invention, the duty cycle of the precharge control pulse signal is adjustable.
In one embodiment of the present invention, a priming system comprises: the driving module is connected with the battery management system and used for generating a driving pulse signal according to the pre-charging control pulse signal; the control electrode of the first switch tube is connected with the driving module, the first electrode of the first switch tube is connected with the first end of the negative relay, the second electrode of the first switch tube is connected with the second end of the negative relay, and the first switch tube is used for being switched on or switched off under the control of the driving pulse signal so as to carry out chopping control on the pre-charging voltage.
In one embodiment of the present invention, the priming system further comprises: the driving module is connected with a control electrode of the first switching tube through the first resistor; a first end of the second resistor is connected with the control electrode of the first switch tube, and a second end of the second resistor is connected with the second electrode of the first switch tube; a third resistor and a first capacitor, which are connected in series between the first pole of the first switch tube and the second pole of the first switch tube; the first pole of the first switch tube is connected with the first end of the negative relay through the fourth resistor and the first fuse which are connected in series.
In one embodiment of the present invention, the priming system further comprises: the power module is connected with the driving module and used for converting the direct-current voltage of the whole vehicle into power voltage so as to provide working voltage for the driving module.
In one embodiment of the present invention, the priming system further comprises: the switch module is respectively connected with the battery management system and the power supply module, and is used for controlling the normal work or stop work of the power supply module according to a power supply switch control signal output by the battery management system.
In one embodiment of the present invention, the high voltage control system of the electric vehicle further includes: the positive relay is connected with the battery management system; the negative relay is connected with the battery management system; a motor controller; and the positive electrode of the high-voltage battery pack is connected with the positive electrode of the motor controller through the positive relay, and the negative electrode of the high-voltage battery pack is connected with the negative electrode of the motor controller through the negative relay.
In order to achieve the above object, a second embodiment of the present invention provides a method for controlling high-voltage power-on of an electric vehicle, including: the battery management system controls the positive relay to be closed; the battery management system outputs a pre-charging control pulse signal to control the pre-charging system to carry out chopping control on pre-charging voltage between the first end of the negative pole relay and the second end of the negative pole relay; when the battery management system detects that the difference value between the voltage of the high-voltage battery pack and the voltage at the two ends of the motor controller is smaller than a preset difference value threshold value, the negative relay is controlled to be closed; and the battery management system stops outputting the pre-charging control pulse signal.
In addition, the control method for high-voltage electrification of the electric automobile provided by the embodiment of the invention further comprises the following additional technical characteristics:
in an embodiment of the present invention, the control method for high voltage power-on of an electric vehicle further includes: and the battery management system adjusts the duty ratio of the pre-charging control pulse signal.
According to the control method for high-voltage power-on of the electric automobile, the battery management system outputs the pre-charging control pulse signal to control the pre-charging system to carry out chopping control on the pre-charging voltage, the pre-charging function is completed, meanwhile, the pre-charging speed can be adjusted by adjusting the pre-charging control pulse signal, therefore, the pre-charging time can be planned according to actual requirements, controllability and intelligence of pre-charging are improved, the pre-charging system with a smaller size is adopted to reduce the occupied space, and the capacity of a battery pack of the electric automobile is increased to improve the endurance mileage.
To achieve the above object, an embodiment of a third aspect of the invention proposes a vehicle including: the high-voltage control system of the electric automobile according to any one of the above embodiments.
Additional aspects and advantages of the invention 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 invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention 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 structural diagram of a high-voltage control system of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pre-charging system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a high-voltage control system of a specific electric vehicle according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a control method for high-voltage power-on of an electric vehicle according to an embodiment of the present invention; and
fig. 5 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, 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 illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The invention mainly aims at the technical problems that the pre-charging speed and the charging time cannot be controlled when an electric automobile is pre-charged in the related technology, and the space of a battery pack is occupied due to the large volumes of a power resistor and a pre-charging relay, and provides a high-voltage control system of the electric automobile and a high-voltage power-on control method thereof, which can adjust the pre-charging speed according to the actual requirement, plan the pre-charging time and reduce the space occupied by the pre-charging system.
The high-voltage control system of the electric vehicle, the control method of the high-voltage power-on of the electric vehicle, and the vehicle according to the embodiment of the invention are described below with reference to the drawings.
Fig. 1 is a schematic structural diagram of a high-voltage control system of an electric vehicle according to an embodiment of the present invention.
As shown in fig. 1, the high voltage control system of the electric vehicle may include a battery management system 10, a precharge system 20, and a negative relay K2.
The pre-charging system 20 is connected to the first terminal and the second terminal of the negative relay K2, and the battery management system 10. The voltage between the first terminal and the second terminal of the negative relay K2 (i.e., the voltage between HV _ in and HV _ out) may be a precharge voltage for precharging the electric vehicle with a power supply apparatus such as a high-voltage battery pack.
In a specific application, the battery management system 10 is configured to output a pre-charge control pulse signal, and in an embodiment of the present invention, the pre-charge control pulse signal may be a Pulse Width Modulation (PWM) signal having a corresponding duty ratio, and the pre-charge control pulse signal may drive the pre-charge system 20 to chop the pre-charge voltage.
Further, after the pre-charging system 20 receives the pre-charging control pulse signal, in an embodiment of the present invention, each functional module in the pre-charging system 20 may be driven to operate according to the pre-charging control pulse signal, so as to perform chopper control on the pre-charging voltage between the first end and the second end of the negative relay, that is, adjust and limit the voltage value of the pre-charging voltage, and output the voltage with a lower converted voltage value to pre-charge the electric vehicle, so as to avoid damage to the high-voltage electric equipment, the main relay, and other equipment. After the high-voltage electric device is precharged, the battery management system 10 stops outputting the precharge control pulse signal, and the precharge system 20 stops chopping.
It should be noted that the pre-charging system 20 in the embodiment of the present invention may be provided independently, or the pre-charging system 20 may be integrated on the control board of the battery management system 10 to reduce the space occupied by the pre-charging system 20 because the volume of each functional module in the pre-charging system 20 in the embodiment of the present invention is small.
In an embodiment of the present invention, the duty ratio of the pre-charge control pulse signal is adjustable, so that a user can control the battery management system 10 to output pre-charge control pulse signals with different duty ratios according to actual needs, and further, the pre-charge system 20 performs chopping control to a corresponding degree according to the pre-charge control pulse signals with different duty ratios, so as to output voltages and currents with different values, so as to control the charging speed and the charging time of pre-charge.
For example, when a user needs to shorten the pre-charging time to realize fast power-on of the entire vehicle, the battery management system 10 may be controlled to output a pre-charging control pulse signal with a large duty ratio, and the pre-charging system 20 chops the pre-charging voltage according to the pre-charging control pulse signal and then outputs a voltage with a large voltage value, so that the voltages at two ends of the high-voltage electric equipment are increased to a preset high-voltage rated voltage at a fast speed to complete pre-charging, thereby increasing the charging speed of pre-charging and realizing control of the charging time.
In summary, in the high-voltage control system of the electric vehicle according to the embodiment of the invention, the battery management system outputs the pre-charge control pulse signal to control the pre-charge system to perform chopping control on the pre-charge voltage, and the pre-charge control pulse signal can be adjusted to adjust the pre-charge speed while completing the pre-charge function, so that the pre-charge time can be planned according to actual requirements, and controllability and intelligence of pre-charge are improved.
Based on the above embodiment, in order to more clearly describe each functional module included in the precharge system and the principle of implementing chopping control in the present embodiment, the precharge system in the embodiment of the present invention is described in detail below, and fig. 2 is a schematic structural diagram of the precharge system provided in the embodiment of the present invention.
As shown in fig. 2, the precharge system includes a driving module (U10), a power module (U12), a connector (P3), a switch module (Q11), a first switch tube (Q5), a first resistor (R15), a second resistor (R51), a third resistor (R48), a fourth resistor (R50), a first capacitor (C33), a first fuse (F1), a fifth resistor (R49), a sixth resistor (R53), a second capacitor (C34), a third capacitor (C37), and a fourth capacitor (C38).
Referring to fig. 2, pin No. 2 of the driving module (U10) is connected to the output terminal of the battery management system 10 to receive the precharge control pulse signal sent by the battery management system 10. The first end of the fifth resistor (R49) is connected with the No. 4 pin of the driving module (U10), the second end of the fifth resistor (R49) is connected with the No. 5 pin of the driving module (U10) and the first end of the second capacitor (C34), the fifth resistor (R49) and the second capacitor (C34) form a low-pass filter circuit of the driving module (U10), and high-frequency signals are prevented from passing through the driving module (U10). The No. 10 pin of the driving module (U10) is connected with the first end of a first resistor (R15), the second end of the first resistor (R15) is connected with the control stage of a first switch tube (Q5), so that the driving module (U10) is connected with the control electrode of the first switch tube (Q5) through a first resistor (R15) and sends a driving pulse signal generated according to the pre-charging control pulse signal to the first switch tube (Q5). Further, the first terminal of the second resistor (R51) is connected to the control terminal of the first switch (Q5), and the second terminal is connected to the second terminal of the first switch (Q5), so that the second resistor (R51) can absorb the energy in the loop, which causes the oscillation, and prevent the resonance from damaging the first switch (Q5). The third resistor (R48) and the first capacitor (C33) are connected in series between the first pole and the second pole of the first switch tube (Q5) to form a voltage suppression circuit, and current at the moment when the first switch tube (Q5) is switched on or switched off is prevented from breaking down the first switch tube (Q5). Furthermore, a first pole of the first switch tube (Q5) is connected with a first end of a fourth resistor (R50), a second end of the fourth resistor (R50) is connected with a first end of a first fuse (F1), a second end of the first fuse (F1) is connected with a pin 4 of a connector (P3), a second pole of the first switch tube (Q5) is connected with a pin 1 of a connector (P3), wherein the pin 4 of the connector (P3) is connected with a first end of a negative relay, the pin 1 of the connector (P3) is connected with a second end of the negative relay, so that the first pole of the first switch tube (Q5) is connected with the first end of the negative relay K2 through the connector (P3) by the fourth resistor (R50) and the first fuse (F1) which are connected in series, the second pole is connected with a second end of the negative relay K2, namely, the second pole is connected with the second end of the second relay K2 through the voltage pre-charging relay (P2) connected between the second end of the connector (P3), the fourth resistor (R50) and the first fuse (F1) limit the current in the pre-charging loop and prevent the first switch tube (Q5) from being damaged when the pre-charging current is too large.
With continued reference to fig. 2, a first pole of the switch module (Q11) is connected to the output of the battery management system 10 and a second pole of the switch module (Q11) is connected to pin No. 1 of the power module (U12) to send the received power switch control signal sent by the battery management system 10 to the switch module (Q11). Furthermore, a pin 2 of the switch module (Q11) is connected with a vehicle direct current Voltage (VBB) and a third capacitor (C37) of the electric vehicle, a sixth resistor (R53) and a fourth capacitor (C38) are connected between a pin 7 and a pin 4 of the switch module (Q11) in parallel, the third capacitor (C37) is connected, and the sixth resistor (R53) and the fourth capacitor (C38) form a low-pass filter circuit of the switch module (Q11). Furthermore, pin No. 7 of the switch module (Q11) is connected to pin No. 11 and pin No. 16 of the drive module (U10), so that the switch module (Q11) converts the received vehicle dc Voltage (VBB) of the electric vehicle into a supply voltage (ViosB) for driving the drive module (U10) to operate, and then sends the supply voltage (ViosB) to the drive module (U10) to drive the drive module (U10) to operate.
During specific application, the battery management system 10 firstly sends a power switch control signal to control the switch module (Q11) to be switched on so as to control the power module (U12) to normally work, then the power module (U12) converts the direct current Voltage (VBB) of the whole vehicle into power voltage (ViosB), and then sends the power voltage (ViosB) to the drive module (U10) to supply power to the drive module (U10). Further, after the driving module (U10) is powered on, the battery management system 10 sends the pre-charge control pulse signal to the driving module (U10), and the driving module (U10) sends the driving pulse signal generated according to the pre-charge control pulse signal to the first switching tube (Q5) to control the first switching tube (Q5) to turn on or off according to the duty ratio of the driving pulse signal, where the duty ratio of the driving pulse signal may be equal to the duty ratio of the pre-charge control pulse signal. Further, the first switching tube (Q5) performs chopper control of the precharge voltage between the first terminal and the second terminal of the negative relay K2 connected to the plug-in (P3), and the precharge voltage is converted into a voltage having a low voltage value by turning on or off the first switching tube (Q5) to precharge the electric vehicle. Finally, when the pre-charging is completed, the battery management system 10 stops sending the pre-charging control pulse signal and the power switch control signal, and the driving module (U10) and the power module (U12) stop working.
From this, the battery management system control pre-charging system carries out chopper control to the precharge voltage, realized the precharge to electric automobile, function module such as drive module, power module and switch tube through among the pre-charging system has replaced power resistor and the pre-charging relay who carries out the precharge among the prior art, because function module such as drive module, power module and switch tube among the pre-charging system can be microdevices such as microchip, so the volume of pre-charging system is less, can integrate on battery management system's control panel, the space that the pre-charging system occupied has been reduced.
In summary, in the pre-charging system according to the embodiment of the invention, the battery management system sends the power switch control signal to control the power module to operate, then the power module supplies power to the driving module, and after the driving module is powered on to operate, the first switching tube is controlled to operate according to the pre-charging control pulse signal to perform chopping control on the pre-charging voltage, and the voltage with a lower voltage value converted from the pre-charging voltage is pre-charged to the electric vehicle. The pre-charging system can perform chopping control on the pre-charging voltage according to different duty ratios in the pre-charging control pulse signal, so that the controllability of pre-charging is improved, the volume of the pre-charging system is smaller, and the occupied space is reduced.
Based on the above embodiments, in order to more clearly and completely describe the working process of the high-voltage control system of the present invention in the pre-charging process, an embodiment of the present invention further provides a specific high-voltage control system of an electric vehicle, and fig. 3 is a schematic structural diagram of the specific high-voltage control system of the electric vehicle provided in the embodiment of the present invention.
As shown in fig. 3, the high voltage control system of the electric vehicle further includes, based on that shown in fig. 1: the high-voltage battery pack comprises a positive electrode relay K1, a motor controller 30, a high-voltage battery pack 40, a second switching tube Q1, a third switching tube Q2 and a second fuse F2.
The high-voltage battery pack 40, the second fuse F2, the positive relay K1, the motor controller 30, and the negative relay K2 form a series circuit as shown in fig. 2. The positive pole of the high-voltage battery pack 40 is connected with the positive pole of the motor controller 30 through a positive pole relay K1, and the negative pole of the high-voltage battery pack 40 is connected with the negative pole of the motor controller 30 through a negative pole relay K2. The first output terminal of the battery management system 10 is connected to the positive relay K1 through a second switch Q1, the second output terminal of the battery management system 10 is connected to the negative relay K2 through a third switch Q2, and the third output terminal of the battery management system 10 is connected to the precharge system 20. The precharge system 10 is connected to the first terminal (a) and the second terminal (B) of the negative relay K2.
The structure of the pre-charging system 20 is as shown in fig. 2 in the above embodiment, the high-voltage battery pack 40 is formed by connecting a plurality of single batteries in series and in parallel, and is used for providing a high-voltage power supply for the entire vehicle, the second fuse F2 is connected in series in a loop to prevent the high-voltage battery pack 40 from being damaged by an excessive current or a short circuit in the loop, the battery management system 10 can respectively control the attraction and disconnection of the positive relay K1 and the negative relay K2 by controlling the on and off of the second switching tube Q1 and the third switching tube Q2, the motor controller 30 is a high-voltage electric device, pre-charging is required before high-voltage power-up, and when a difference between a voltage at two ends of the motor controller 30 and a voltage of the high-voltage battery pack 40 is smaller than a preset difference threshold.
In particular, as a possible implementation manner, when performing the pre-charging, the battery management system 10 first detects whether the high-voltage interlock signal is normal, that is, whether the connector of the pre-charging system 20 in the above example is correctly connected. Then, when it is determined that the high-voltage interlock detection is normal, the first output terminal of the battery management system 10 sends a first control signal to the second switching tube Q1 to control the Q1 to be turned on, and further controls the positive relay K1 to be closed, so that the high-voltage battery pack 40 provides the precharge voltage.
Further, after the positive relay K1 of the battery management system 10 is closed, the third output terminal of the battery management system 10 sends a power switch control signal to the switch module in the pre-charging system 20 to control the power module in the pre-charging system 20 to supply power to the driving module, and then after it is determined that the driving module is powered on and running, the battery management system 10 sends a pre-charging control pulse signal with a duty ratio of a corresponding size to the driving module in the pre-charging system 20 through the third output terminal according to actual needs, so that the pre-charging system 20 performs chopper control on the pre-charging voltage between A, B two points as described in the above embodiment, thereby adjusting and limiting the pre-charging voltage between A, B two points, and outputting a voltage with a lower converted voltage value to pre-charge the motor controller 30.
Furthermore, in the pre-charging process, the battery management system 10 detects the voltage at two ends of the motor controller 30 in real time, and as the pre-charging system 20 performs chopping control continuously, the voltage at two ends of the motor controller 30 gradually increases, and when the battery management system 10 detects that the difference between the voltage of the high-voltage battery pack 40 and the voltage at two ends of the motor controller 30 is smaller than the preset difference threshold, the second output end of the battery management system 10 sends a second control signal to the third switching tube Q2 to control the Q2 to be turned on, so as to control the negative relay K2 to attract, and stop applying the pre-charging voltage to the pre-charging system 20, so as to facilitate the subsequent control of the pre-charging system 20 to stop working.
Finally, the battery management system 10 controls the pre-charging system 20 to stop chopping, that is, the battery management system 10 stops sending the pre-charging control pulse signal and the power switch control signal in sequence, so that the pre-charging system 20 stops working, and pre-charging is finished.
Therefore, the high-voltage control system of the embodiment of the invention realizes high-voltage pre-charging, and avoids the damage of high voltage on high-voltage electric equipment such as a motor controller and a relay when the high voltage is electrified. In addition, in the pre-charging process, the pre-charging time can be controlled by adjusting the duty ratio of a pre-charging control pulse signal sent by the battery management system, so that the quick power-on function of the whole vehicle is favorably realized, and the controllability of pre-charging is improved.
In order to realize the embodiment, the invention further provides a control method for high-voltage electrification of the electric automobile. The control method for high-voltage power-on of the electric automobile is realized based on the high-voltage control system of the electric automobile.
Fig. 4 is a schematic flowchart of a control method for high-voltage power-on of an electric vehicle according to an embodiment of the present invention, and as shown in fig. 4, the method includes the following steps:
and step 101, controlling the positive relay to be closed by the battery management system.
And 102, outputting a pre-charging control pulse signal by the battery management system, and controlling the pre-charging system to perform chopping control on pre-charging voltage between the first end of the negative relay and the second end of the negative relay.
The pre-charge control pulse signal may be a Pulse Width Modulation (PWM) signal with a corresponding duty ratio, and the pre-charge system 20 may be driven to chop the pre-charge voltage through the pre-charge control pulse signal.
It should be noted that, in an embodiment of the present invention, the battery management system may adjust the duty ratio of the pre-charge control pulse signal, so as to control the pre-charge system 20 to perform chopping control to a corresponding degree according to the pre-charge control pulse signals with different duty ratios, so as to output voltages and currents with different values, and control the charging speed and charging time of pre-charge.
And 103, when the battery management system detects that the difference value between the voltage of the high-voltage battery pack and the voltage at the two ends of the motor controller is smaller than a preset difference value threshold value, controlling the negative relay to be closed.
Specifically, in the pre-charging process, the battery management system detects the voltage at the two ends of the motor controller in real time, and when the battery management system detects that the difference value between the voltage of the high-voltage battery pack and the voltage at the two ends of the motor controller is smaller than a preset difference threshold value, the pre-charging of the motor controller is completed, so that the battery management system controls the negative relay to be closed, the pre-charging voltage is stopped being applied to the pre-charging system 20, and the pre-charging system 20 is conveniently controlled to stop working subsequently.
In step 104, the battery management system stops outputting the pre-charge control pulse signal.
And finally, the battery management system stops outputting the pre-charging control pulse signal so as to control the pre-charging system to stop chopping and finish pre-charging.
It should be noted that, for the specific implementation of each step, reference may be made to the description in the foregoing example, and details are not described here.
In summary, in the control method for high-voltage power-on of an electric vehicle according to the embodiment of the present invention, the battery management system outputs the pre-charge control pulse signal to control the pre-charge system to perform chopping control on the pre-charge voltage, and the pre-charge control pulse signal can be adjusted to adjust the pre-charge speed while completing the pre-charge function, so that the pre-charge time can be planned according to the actual requirement, the controllability and the intelligence of the pre-charge are improved, and the pre-charge system with a smaller volume is adopted to reduce the space occupied by the pre-charge system, which is beneficial to increase the capacity of the battery pack of the electric vehicle to improve the.
In order to implement the above embodiment, the embodiment of the present invention further provides a vehicle, as shown in fig. 5, the vehicle 100 includes a high-voltage control system 200 of an electric vehicle according to the above embodiment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. 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 more 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 invention, "a plurality" 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 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 invention 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 the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in 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.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A high voltage control system for an electric vehicle, comprising:
the battery management system is used for outputting a pre-charging control pulse signal;
the pre-charging system is respectively connected with the first end of the negative relay, the second end of the negative relay and the battery management system, and the pre-charging system is used for carrying out chopping control on pre-charging voltage between the first end of the negative relay and the second end of the negative relay according to the pre-charging control pulse signal.
2. The high voltage control system of claim 1, wherein a duty cycle of the pre-charge control pulse signal is adjustable.
3. The high pressure control system of claim 1, wherein the pre-charge system comprises:
the driving module is connected with the battery management system and used for generating a driving pulse signal according to the pre-charging control pulse signal;
the control electrode of the first switch tube is connected with the driving module, the first electrode of the first switch tube is connected with the first end of the negative relay, the second electrode of the first switch tube is connected with the second end of the negative relay, and the first switch tube is used for being switched on or switched off under the control of the driving pulse signal so as to carry out chopping control on the pre-charging voltage.
4. The high pressure control system of claim 3, wherein the pre-charge system further comprises:
the driving module is connected with a control electrode of the first switching tube through the first resistor;
a first end of the second resistor is connected with the control electrode of the first switch tube, and a second end of the second resistor is connected with the second electrode of the first switch tube;
a third resistor and a first capacitor, which are connected in series between the first pole of the first switch tube and the second pole of the first switch tube;
the first pole of the first switch tube is connected with the first end of the negative relay through the fourth resistor and the first fuse which are connected in series.
5. The high pressure control system of claim 3, wherein the pre-charge system further comprises:
the power module is connected with the driving module and used for converting the direct-current voltage of the whole vehicle into power voltage so as to provide working voltage for the driving module.
6. The high pressure control system of claim 5, wherein the pre-charge system further comprises:
the switch module is respectively connected with the battery management system and the power supply module, and is used for controlling the normal work or stop work of the power supply module according to a power supply switch control signal output by the battery management system.
7. The high pressure control system of any of claims 1-6, further comprising:
the positive relay is connected with the battery management system;
the negative relay is connected with the battery management system;
a motor controller;
and the positive electrode of the high-voltage battery pack is connected with the positive electrode of the motor controller through the positive relay, and the negative electrode of the high-voltage battery pack is connected with the negative electrode of the motor controller through the negative relay.
8. A control method for high-voltage power-on of an electric vehicle is characterized by being applied to the high-voltage control system of the electric vehicle according to claim 7, and comprising the following steps:
the battery management system controls the positive relay to be closed;
the battery management system outputs a pre-charging control pulse signal to control the pre-charging system to carry out chopping control on pre-charging voltage between the first end of the negative pole relay and the second end of the negative pole relay;
when the battery management system detects that the difference value between the voltage of the high-voltage battery pack and the voltage at the two ends of the motor controller is smaller than a preset difference value threshold value, the negative relay is controlled to be closed;
and the battery management system stops outputting the pre-charging control pulse signal.
9. The control method according to claim 8, characterized by further comprising:
the battery management system adjusts a duty ratio of the pre-charge control pulse signal.
10. A vehicle, characterized by comprising: the high voltage control system of an electric vehicle according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894150.4A CN110588435A (en) | 2019-09-20 | 2019-09-20 | High-voltage control system of electric automobile and high-voltage power-on control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894150.4A CN110588435A (en) | 2019-09-20 | 2019-09-20 | High-voltage control system of electric automobile and high-voltage power-on control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110588435A true CN110588435A (en) | 2019-12-20 |
Family
ID=68861882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910894150.4A Pending CN110588435A (en) | 2019-09-20 | 2019-09-20 | High-voltage control system of electric automobile and high-voltage power-on control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110588435A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113071315A (en) * | 2021-03-10 | 2021-07-06 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330225A (en) * | 2008-07-08 | 2008-12-24 | 奇瑞汽车股份有限公司 | Apparatus for monitoring high voltage output of power battery |
| CN102390279A (en) * | 2011-09-21 | 2012-03-28 | 奇瑞汽车股份有限公司 | Safe control loop of electric automobile |
| CN103342100A (en) * | 2013-07-23 | 2013-10-09 | 北京经纬恒润科技有限公司 | Power-on monitoring method and system of electric automobile |
| KR20140132567A (en) * | 2013-05-08 | 2014-11-18 | 전광수 | Hybrid electric vehicles high-voltage battery charging device |
| CN104901355A (en) * | 2015-04-14 | 2015-09-09 | 北汽福田汽车股份有限公司 | Pre-charging device and method of electric automobile |
| DE102014219211A1 (en) * | 2014-09-23 | 2016-03-24 | Robert Bosch Gmbh | Electric actuator with preheating |
| CN107317368A (en) * | 2017-06-29 | 2017-11-03 | 湖北航天技术研究院总体设计所 | A kind of microminiature pre-charging device and pre-charge method |
| CN206758359U (en) * | 2017-04-14 | 2017-12-15 | 广州视源电子科技股份有限公司 | Control relay circuit and power circuit |
-
2019
- 2019-09-20 CN CN201910894150.4A patent/CN110588435A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330225A (en) * | 2008-07-08 | 2008-12-24 | 奇瑞汽车股份有限公司 | Apparatus for monitoring high voltage output of power battery |
| CN102390279A (en) * | 2011-09-21 | 2012-03-28 | 奇瑞汽车股份有限公司 | Safe control loop of electric automobile |
| KR20140132567A (en) * | 2013-05-08 | 2014-11-18 | 전광수 | Hybrid electric vehicles high-voltage battery charging device |
| CN103342100A (en) * | 2013-07-23 | 2013-10-09 | 北京经纬恒润科技有限公司 | Power-on monitoring method and system of electric automobile |
| DE102014219211A1 (en) * | 2014-09-23 | 2016-03-24 | Robert Bosch Gmbh | Electric actuator with preheating |
| CN104901355A (en) * | 2015-04-14 | 2015-09-09 | 北汽福田汽车股份有限公司 | Pre-charging device and method of electric automobile |
| CN206758359U (en) * | 2017-04-14 | 2017-12-15 | 广州视源电子科技股份有限公司 | Control relay circuit and power circuit |
| CN107317368A (en) * | 2017-06-29 | 2017-11-03 | 湖北航天技术研究院总体设计所 | A kind of microminiature pre-charging device and pre-charge method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113071315A (en) * | 2021-03-10 | 2021-07-06 | 重庆长安汽车股份有限公司 | Method and system for detecting connection integrity of high-voltage electrical system of electric automobile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10710469B2 (en) | Automotive dual voltage battery charging system | |
| CN105539156A (en) | High voltage control circuit, high voltage control method and vehicle | |
| US9180781B2 (en) | Electric automobile | |
| KR20210133374A (en) | System and method for charging using motor driving system | |
| KR101866063B1 (en) | System for controlling relay of an auxiliary battery and method thereof | |
| JP6608287B2 (en) | System comprising a battery formed from a battery module and corresponding method for connecting or disconnecting a battery module | |
| CN110588435A (en) | High-voltage control system of electric automobile and high-voltage power-on control method thereof | |
| CN111746308B (en) | Electric power system and control method thereof | |
| CN113183761A (en) | High-voltage pre-charging loop, high-voltage pre-charging method and high-voltage pre-charging system of electric automobile | |
| CN114123423B (en) | Control circuit and control method for movable body with multiple driving modes | |
| US11065975B2 (en) | Method for electrically charging an energy store by switching between two configurations | |
| KR101866001B1 (en) | Method and system for controlling low voltage dc/dc comverter for hybrid electric vehicle | |
| KR20190066376A (en) | Smart pra pre-charging system | |
| CN112406537A (en) | Vehicle and control system and method thereof | |
| WO2020125711A1 (en) | Auxiliary power supply system of railway vehicle, and control method therefor | |
| KR20170064914A (en) | Apparatus for protecting high voltage battery of green car and method thereof | |
| CN220577065U (en) | Charging control device, system and vehicle | |
| KR102239678B1 (en) | The electric vehicle for agriculture, and the circuit and the method for charging-discharging battery for the same | |
| CN215817587U (en) | New energy automobile air conditioner control circuit and new energy automobile | |
| US20240088690A1 (en) | Method and system for charger adaptive voltage regulation | |
| CN117261793A (en) | Power supply circuit, electronic device, vehicle, and power supply method | |
| CN117284140A (en) | Vehicle battery charge and discharge control method and device, electronic equipment and storage medium | |
| EP4160894A1 (en) | Direct current converter, control method, vehicle, device, program, and medium | |
| US10538176B2 (en) | Method for managing a load supplied by a converter that is itself supplied by a battery, and corresponding system | |
| CN117526464A (en) | Charging circuit, control method of charging circuit, vehicle controller and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191220 |