CN114696290A - Control system for preventing high-voltage relay from generating adhesion fault in electric vehicle - Google Patents
Control system for preventing high-voltage relay from generating adhesion fault in electric vehicle Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0092—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption with use of redundant elements for safety purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
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Abstract
The invention discloses a control system for preventing a high-voltage relay from generating adhesion faults in an electric vehicle, which outputs a low-voltage control signal to a second end of a coil in the high-voltage relay through a battery pack management module so as to electrify the coil in the high-voltage relay, attracts the high-voltage relay, prepares a power supply module for working when the power supply voltage of the coil in the high-voltage relay is detected to be smaller than a first preset voltage value, and compensates power for the coil in the high-voltage relay, so that when the voltage at two ends of the coil in the high-voltage relay is lower and the adhesion faults are likely to occur, the voltage compensation is timely performed on the coil in the high-voltage relay, the adhesion of the high-voltage relay is prevented when the high voltage is cut off under load, and the safety of the vehicle is improved.
Description
Technical Field
The invention relates to the technical field of relays, in particular to a control system for preventing a high-voltage relay from generating adhesion faults in an electric vehicle.
Background
With the rapid development of new energy automobiles, the high-voltage safety problem of new energy automobiles is more and more emphasized by users and whole automobile factories. The high-voltage relay is usually arranged in the battery pack and comprises a coil control loop and a switch loop controlled by the coil control loop, the coil control loop is usually supplied with power by a 12V storage battery in the vehicle, and the battery pack management system controls the on-off of the high-voltage relay through controlling the coil control loop. The inventor is generating electricity at the in-process that realizes traditional technique, and when the supply voltage of high voltage relay's coil was crossed lowly, if high voltage relay was in the on-load and cuts off high-voltage status this moment, the contact that will lead to high voltage relay melts the adhesion for whole car lasts takes high pressure, causes the potential safety hazard.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, a first object of the present invention is to provide a control system for preventing a sticking failure of a high-voltage relay in an electric vehicle, which can prevent the sticking failure of the high-voltage relay when the high voltage is to be cut off, and improve the safety of the vehicle.
A second object of the present invention is to provide an electric vehicle.
A third object of the present invention is to provide a control method for preventing a sticking failure of a high-voltage relay in an electric vehicle.
In order to achieve the above object, a first embodiment of the present invention provides a control system for preventing a high-voltage relay from generating a sticking fault in an electric vehicle, including:
the input end of the first power supply conversion circuit is connected with the high-voltage power supply output end of the electric vehicle, the output end of the first power supply conversion circuit is connected with the first end of the coil in the high-voltage relay, and the first power supply conversion circuit is used for converting first direct current provided by the high-voltage power supply output end so as to supply power to the coil in the high-voltage relay;
the standby power supply module is used for converting first direct current provided by the high-voltage power supply output end so as to compensate and supply power to the coil in the high-voltage relay;
the battery pack management module is used for outputting a low-voltage control signal to the second end of the coil in the high-voltage relay so as to electrify the coil in the high-voltage relay, attracting the high-voltage relay and controlling the power supply module to work when detecting that the power supply voltage of the coil in the high-voltage relay is smaller than a first preset voltage value so as to compensate and supply power to the coil in the high-voltage relay.
According to the control system for preventing the high-voltage relay from generating the adhesion fault in the electric vehicle of the embodiment of the invention, the first direct current provided by the high-voltage power supply output end is converted through the first power supply conversion circuit so as to supply power to the coil in the high-voltage relay, the first direct current provided by the high-voltage power supply output end is converted through the standby power supply module so as to compensate and supply power to the coil in the high-voltage relay, the low-voltage control signal is output to the second end of the coil in the high-voltage relay through the battery pack management module so as to electrify the coil in the high-voltage relay, the high-voltage relay is attracted, the preparation power supply module is operated when the power supply voltage of the coil in the high-voltage relay is detected to be smaller than the first preset voltage value so as to compensate and supply power to the coil in the high-voltage relay, so that when the adhesion fault is likely to occur at the lower voltage of the two ends of the coil in the high-voltage relay, the coil in the high-voltage relay is subjected to voltage compensation in time, the high-voltage relay is prevented from being adhered when the high voltage is cut off under load, and the safety of a vehicle is improved
According to one embodiment of the present invention, the battery pack management module detects the supply voltage at preset time intervals after the power-on self-test is completed, wherein,
when the power supply voltage is detected to drop for N times continuously and the minimum value of the power supply voltage in the detection results of the N times is smaller than a second preset voltage value, performing primary fault alarm and sending a primary fault alarm signal to the vehicle control unit, wherein N is an integer greater than or equal to 1, and the second preset voltage value is greater than the first preset voltage value;
and when the power supply voltage is detected to be smaller than the first preset voltage value, performing secondary fault alarm, and sending a secondary fault alarm signal to the vehicle control unit.
According to one embodiment of the invention, the battery pack management module performs three-level fault alarm when receiving a vehicle collision signal and sends the three-level fault alarm signal to the vehicle control unit.
According to one embodiment of the invention, when the battery pack management module performs primary fault alarm, the primary fault code is recorded, the flag bit is collocated, and whether the high-voltage relay is closed or not is judged, wherein,
if the high-voltage relay is not in suction, a suction prohibition signal of the high-voltage relay is output to prevent the high-voltage relay from generating adhesion faults.
According to one embodiment of the invention, when the battery pack management module performs the secondary fault alarm, the secondary fault code is recorded, the flag bit is collocated, and whether the high-voltage relay is closed or not is judged, wherein,
if the high-voltage relay is not in operation, outputting an operation prohibition signal of the high-voltage relay to prevent the high-voltage relay from generating adhesion fault;
if the high-voltage relay is attracted, the standby power supply module is controlled to work so as to supply power to a coil in the high-voltage relay in a compensation mode, and a high-voltage output power limiting instruction is sent to the vehicle control unit, so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time.
According to one embodiment of the invention, when the battery pack management module carries out three-level fault alarm, the battery pack management module records a three-level fault code, and carries out collocation of a flag bit and detects whether to carry out two-level fault alarm or not;
if the secondary fault alarm is not detected, sending a high-voltage output power limiting instruction to the vehicle control unit so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time;
and if the secondary fault alarm is detected, controlling the standby power supply module to work so as to perform compensation power supply on a coil in the high-voltage relay and sending a high-voltage output power limiting instruction to the vehicle control unit, so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time.
According to one embodiment of the present invention, the response priority of the tertiary fault alarm is higher than the response priority of the secondary fault alarm, and the response priority of the secondary fault alarm is higher than the response priority of the primary fault alarm.
According to one embodiment of the invention, a backup power module comprises:
the input end of the second power supply conversion circuit is connected with the high-voltage power supply output end of the electric vehicle, and the second power supply conversion circuit is used for converting the first direct current provided by the high-voltage power supply output end;
the emergency relay, the one end of switch links to each other with second power supply switching circuit's output in the emergency relay, and the other end of switch links to each other with the first end of high-voltage relay coil in the emergency relay, and the one end of coil is connected to the low potential in the emergency relay, and the other end of coil is as reserve power module's control end in the emergency relay, and the emergency relay is used for breaking off or actuation under battery package management module's control to whether control second power supply switching circuit carries out work.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides an electric vehicle, including the control system for preventing the high-voltage relay from generating the sticking fault in the electric vehicle.
According to the electric vehicle provided by the embodiment of the invention, through the control system for preventing the high-voltage relay from being adhered to generate the fault in the electric vehicle, the standby power supply module can be timely controlled to perform compensation power supply on the coil in the high-voltage relay when the fault occurs, the adhesion of the high-voltage relay caused by the excessively low power supply voltage of the coil in the high-voltage relay is prevented, and the safety of the vehicle can be improved.
In order to achieve the above object, a third embodiment of the present invention provides a control method for preventing a high-voltage relay from generating a sticking fault in an electric vehicle, where the electric vehicle is the aforementioned electric vehicle, and the control method includes the following steps:
after the battery pack management module finishes power-on self-detection, detecting the power supply voltage of a coil in the high-voltage relay;
when detecting that the power supply voltage of the coil in the high-voltage relay is smaller than a first preset voltage value, controlling the standby power supply module to work so as to compensate and supply power to the coil in the high-voltage relay.
According to the control method for preventing the high-voltage relay from being adhered in the electric vehicle, the battery pack management module detects the power supply voltage of the coil in the high-voltage relay after the power-on self-detection is finished, and when the power supply voltage of the coil in the high-voltage relay is detected to be smaller than a first preset voltage value, the standby power supply module is controlled to work to compensate and supply power to the coil in the high-voltage relay, so that the adhesion of the high-voltage relay caused by the fact that the power supply voltage of the coil in the high-voltage relay is too low can be prevented, and the safety of the vehicle can be improved.
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
FIG. 1 is a schematic diagram of a high voltage power supply circuit of a vehicle in the prior art;
fig. 2 is a schematic configuration diagram of a control system for preventing a sticking failure of a high-voltage relay in an electric vehicle according to an embodiment of the present invention;
fig. 3 is a schematic configuration diagram of a control system for preventing a sticking failure of a high-voltage relay in an electric vehicle according to still another embodiment of the present invention;
fig. 4 is a flowchart of a control method for preventing a sticking fault of a high-voltage relay in an electric 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 accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
Fig. 1 is a schematic diagram of a high-voltage power supply of a vehicle in the prior art. If the high-voltage positive relay PR and the high-voltage negative relay NR are adhered in the high-voltage power supply circuit, the vehicle-mounted high-voltage electric appliances such as the motor controller PEU, the oil pump controller O/P and the compressor A/C which are connected at the later stage are in an uncontrollable dangerous state with high voltage continuously, and huge high-voltage safety risks are brought to transportation, disassembly and maintenance of high-voltage vehicles at the later stage.
In general, a high-voltage relay may cause contact sticking under a short-circuit large-current impact or a load cut-off high-voltage condition. If the high-voltage power supply circuit has a short-circuit large current, a fuse arranged in a manual maintenance switch MSD in the battery pack is fused, and the vehicle can be driven to run down at a high voltage. And if the high-voltage relay is in a load cut-off high-voltage state, the fuse cannot be fused, and the whole vehicle is continuously in a high-voltage state.
The inventor finds that the high-voltage relay is easy to be adhered when the coil power supply voltage of the high-voltage relay is too low and the high voltage is cut off under load. The analysis process is as follows:
the high-voltage relay includes a low-voltage coil and a high-voltage side switch controlled by the low-voltage coil. The low-voltage side control loop of the high-voltage relay comprises a battery pack management module, a 12V storage battery and a DCDC converter. The DCDC converter is used for converting high-voltage direct current output by a vehicle into low-voltage direct current and charging a 12V storage battery. The 12V storage battery supplies power for the battery pack management module and the low-voltage coil. The battery pack management module controls the on-off of the switch on the high-voltage side by controlling the on-off of the low-voltage coil. After the ignition signal of the whole vehicle is sent out, the battery pack management module is electrified, and self-checking and state judgment are carried out. When a driver steps on a brake, the high voltage is started by one key, and after the battery pack management module detects a condition that the high voltage is met, a low-voltage control signal is sent to the low-voltage coil, so that the 12V storage battery, the low-voltage coil and the battery pack management module form a power supply loop, the low-voltage coil is electrified, and the high-voltage relay is electrically controlled to be closed, so that the process that the high voltage is loaded on the high-voltage relay is completed. If the supply voltage of the 12V battery is reduced (for example, to 7V) during the operation of the high-voltage relay, the low-voltage side control loop of the high-voltage relay cannot be maintained in a closed state and is opened, and if the high-voltage loop is discharging to the outside (for example, under the working conditions of vehicle driving forward or air conditioner refrigerating), the high-voltage side loop will be cut off with load, and the high-voltage relay may be stuck. If the power supply voltage of the 12V battery is extremely low (for example, 5V), except that the low-voltage side control loop cannot be maintained closed, the battery pack management module is also turned off due to the fact that the voltage is too low and the battery pack management module cannot normally work, so that a low-voltage control signal of a high-voltage relay originally output by the battery pack management module is not output, and further, the loop on the high-voltage side is cut off with load. The reason why the low-voltage side power supply voltage is too low is that the DCDC converter has no output and the 12V secondary battery is aged and cannot be discharged or the discharge voltage is too low.
In view of the above technical problem, as shown in fig. 2, the present application provides a control system for preventing a high voltage relay from adhesion fault in an electric vehicle, which includes a first power conversion circuit 100, a standby power module 200, and a battery pack management module 300.
The input end of the first power conversion circuit 100 is connected with the high-voltage power supply output end of the electric vehicle, the output end of the first power conversion circuit 100 is connected with the first end of the coil L1 in the high-voltage relay, and the first power conversion circuit 100 is used for converting first direct current provided by the high-voltage power supply output end so as to supply power to the coil L1 in the high-voltage relay.
The input end of the standby power supply module 200 is connected with the high-voltage power supply output end of the electric vehicle, the output end of the standby power supply module 200 is connected with the first end of the coil L1 in the high-voltage relay, and the standby power supply module 200 is used for converting the first direct current provided by the high-voltage power supply output end so as to supply power to the coil L1 in the high-voltage relay in a compensating mode.
The first end of the battery pack management module 300 is connected with the second end of the coil L1 in the high-voltage relay, the second end of the battery pack management module 300 is connected with the first end of the coil L1 in the high-voltage relay, the third end of the battery pack management module 300 is connected with the control end of the standby power supply module 200, the battery pack management module 300 is used for outputting a low-voltage control signal to the second end of the coil in the high-voltage relay so as to electrify the coil L1 in the high-voltage relay, attract the high-voltage relay, and when the fact that the power supply voltage of the coil L1 in the high-voltage relay is smaller than a first preset voltage value is detected, the standby power supply module 200 is prepared to work so as to supply power to the coil L1 in the high-voltage relay in a compensation mode.
Specifically, the first power conversion circuit 100 may be a DCDC converter for converting a first direct current provided by a high-voltage power supply output terminal of the vehicle into a low-voltage direct current and supplying power to the coil L1 of the high-voltage relay. Wherein, the high voltage power supply device of the vehicle may be a power battery of the vehicle, and the DCDC converter may convert a first direct current output by the power battery into 12V and supply power to the coil L1 in the high voltage relay. When the coil L1 in the high-voltage relay is electrified, the switch K1 in the high-voltage relay can be closed, so that the working circuit on the high-voltage side can be controlled to be electrified and operated.
After the battery pack management module 300 is powered on, if a power-on demand of the high-voltage relay is received, a low-voltage control signal is output to the second end of the coil L1 in the high-voltage relay, so that the coil L1 in the high-voltage relay is powered on, and then the switch K1 in the high-voltage relay can be closed, so that the power-on work of a work circuit on the high-voltage side can be controlled. The battery pack management module 300 detects voltages at two ends of a coil L1 in the high-voltage relay in real time, and if the voltages at two ends of a coil L1 in the high-voltage relay are smaller than a first preset value, contacts of the high-voltage relay are likely to be adhered if the high-voltage relay is in a load cut-off state. Therefore, when the battery pack management module 300 detects that the voltage at the two ends of the coil L1 in the high-voltage relay is smaller than the first preset value, the standby power supply module 200 is controlled to work, so that the standby power supply module 200 converts the first direct current provided by the high-voltage power supply output end of the vehicle into the compensation voltage to perform compensation power supply for the coil L1 in the high-voltage relay, and therefore the voltage at the two ends of the coil L1 in the high-voltage relay is higher than the first preset value, and the contact adhesion fault of the high-voltage relay is prevented.
In the control system for preventing the high-voltage relay from generating the adhesion fault in the electric vehicle provided by the above embodiment, the first direct current provided by the high-voltage power supply output terminal is converted by the first power conversion circuit to supply power to the coil in the high-voltage relay, the first direct current provided by the high-voltage power supply output terminal is converted by the standby power supply module to compensate and supply power to the coil in the high-voltage relay, and the low-voltage control signal is output to the second end of the coil in the high-voltage relay by the battery pack management module to electrify the coil in the high-voltage relay, so as to attract the high-voltage relay, and the preparation power supply module is operated to compensate and supply power to the coil in the high-voltage relay when the supply voltage of the coil in the high-voltage relay is detected to be smaller than the first preset voltage value, so that when the adhesion fault is likely to occur at the lower voltage of the two ends of the coil in the high-voltage relay, and the coil in the high-voltage relay is subjected to voltage compensation in time, so that the high-voltage relay is prevented from being adhered when the high voltage is cut off under load, and the safety of a vehicle is improved.
As shown in fig. 3, in one embodiment, the backup power module 200 includes a second power conversion circuit 210 and an emergency relay 220. The input end of the second power conversion circuit 210 is connected to the high-voltage power supply output end of the electric vehicle, and the second power conversion circuit 210 is configured to convert the first direct current provided by the high-voltage power supply output end. One end of a switch K2 in the emergency relay 220 is connected to the output end of the second power conversion circuit 210, the other end of a switch K2 in the emergency relay 220 is connected to the first end of a high-voltage relay coil L1, one end of a coil L2 in the emergency relay 220 is connected to a low potential, the other end of a coil L2 in the emergency relay 220 is used as the control end of the standby power supply module 200, and the emergency relay 220 is used for being switched off or switched on under the control of the battery pack management module 300 to control whether the second power conversion circuit 210 works or not.
Specifically, in this embodiment, the second power conversion circuit 210 may also be a standby DCDC converter, which converts the first direct current provided by the high-voltage power supply output terminal into a compensation voltage. In this embodiment, the compensation voltage output by the second power conversion circuit 210 is generally lower than the supply voltage output by the first power conversion circuit 100. Because reserve DCDC converter only supports coil L1 return circuit work among the high-voltage relay temporarily, prevents to arouse that high-voltage relay carries to switch and the adhesion, considers different new forms of energy motorcycle types power consumption demands and cost requirement, and this reserve DCDC converter's power is difficult too big, can select between 500W ~ 1KW power.
The second power switching circuit 210 supplies power to the coil L1 in the high voltage relay through the emergency relay 220. Wherein the emergency relay 200 is controlled by the battery pack management module 300. When the battery pack management module 300 detects that the voltage across the coil L1 in the high-voltage relay is lower than the first preset value, the coil L2 in the emergency relay 200 is controlled to be energized, so that the switch K2 in the emergency relay 200 is controlled to be closed, and the second power conversion circuit 210 can supply power to the coil L1 in the high-voltage relay through the emergency relay 220.
As shown in fig. 3, further, the control system for preventing the high-voltage relay from sticking fault in the electric vehicle may further include a 12V battery 400, and the first power conversion circuit 100 may further convert the first direct current provided by the high-voltage power supply output terminal of the vehicle into a low-voltage direct current and supply power to the 12V battery 400, so that the 12V battery supplies power to the battery pack management module 300, the coil L2 in the emergency relay 200, and other low-voltage electrical appliances of the vehicle. In this embodiment, the 12V battery 400 supplies power to the pack management module 300 through the low-voltage relay 500. The switch K3 end of the low-voltage relay 500 is connected with the battery pack management module 300, the other end of the low-voltage relay is connected with the anode of the 12V storage battery 400, one end of the coil L3 of the low-voltage relay 500 is connected with the cathode of the 12V storage battery, and the other end of the coil L3 of the low-voltage relay is connected with the vehicle controller of the vehicle and used for receiving an ignition signal. When the ignition signal comes, the coil L3 of the low voltage relay 500 is energized, and then the switch K3 of the low voltage relay 500 is closed, so that the 12V secondary battery can supply power to the pack management module 300 through the low voltage relay 500.
In one embodiment, after the power-on self-test is completed, the battery pack management module 300 detects the power supply voltage at preset time intervals, wherein when it is detected that the power supply voltage decreases N times continuously and the minimum value of the power supply voltage in the N times of detection results is smaller than a second preset voltage value, a primary fault alarm is performed, and a primary fault alarm signal is sent to the vehicle control unit, where N is an integer greater than or equal to 1, and the second preset voltage value is greater than the first preset voltage value. And when the power supply voltage is detected to be smaller than the first preset voltage value, performing secondary fault alarm, and sending a secondary fault alarm signal to the vehicle control unit.
Specifically, the power supply voltage of the coil L1 of the high-voltage relay is generally 12V. After the power-on self-test of the battery pack management module 300 is completed, the power supply voltage is actively monitored in real time, and the battery pack management module 300 can sample the power supply voltage as a voltage sampling period every 20 ms. If the voltage values of N consecutive periods all decrease by 5%, and the absolute value of the lowest supply voltage in the N periods is smaller than a first preset value (e.g., 10V), it is determined that the supply voltage of the coil L1 of the high-voltage relay has an obvious decrease trend, at this time, the battery pack management module 300 performs a primary fault alarm, and sends a primary alarm signal to the vehicle controller, for example, the supply voltage is obviously decreased on a CAN message and sent as a primary alarm fault.
And when the battery pack management module 300 detects that the power supply voltage is smaller than the first preset value, performing secondary fault alarm, and sending a secondary fault alarm signal to the vehicle control unit. The first preset value is smaller than the second preset value, and in this embodiment, the first preset value may be 9V. That is, the battery pack management module 300 monitors that the power supply voltage at the two ends of the coil L1 in the high-voltage relay is less than 9V, and determines that the power supply voltage is too low, and at this time, the power supply voltage is too low on the CAN message and is sent as a secondary alarm fault.
In one embodiment, the battery pack management module 300 performs a three-level fault alarm when receiving the vehicle collision signal, and transmits the three-level fault alarm signal to the vehicle control unit.
The control system for preventing adhesion fault of the high-voltage relay in the electric vehicle provided by the embodiment, the battery pack management module 100 can monitor the power supply voltage of the coil L1 in the high-voltage relay, carry out fault early warning according to the power supply voltage, and also can carry out fault early warning according to the collision signal of the vehicle, so that the power supply voltage of the coil L1 in the high-voltage relay is controlled in time to work in a normal range when a fault occurs, the adhesion is prevented from occurring when the high-voltage relay is cut off with load, and the safety of the vehicle can be improved.
In one embodiment, the battery pack management module 300 may implement different control strategies based on the detected failure level.
As an example, when the battery pack management module 300 performs a primary fault alarm, it records a primary fault code, and sets a flag bit, and determines whether the high-voltage relay is activated. If the high-voltage relay is not attracted, an attraction prohibition signal of the high-voltage relay is output to prevent the high-voltage relay from generating adhesion faults.
If the high-voltage relay has attracted a high voltage, the battery pack management module 300 pays attention to whether a secondary fault occurs, without issuing other commands. After the high voltage of the whole vehicle is reached and before the first-level fault code is not cleared, the battery pack management module 300 sets the fault flag bit to be 1 all the time and prohibits the high-voltage relay from being attracted again.
As yet another example, when the battery pack management module 300 performs a secondary fault alarm, it records a secondary fault code, and sets a flag bit, and determines whether the high-voltage relay is engaged. If the high-voltage relay is not attracted, an attraction prohibition signal of the high-voltage relay is output to prevent the high-voltage relay from generating adhesion faults. If the high-voltage relay is closed, the standby power supply module 200 is controlled to work to perform compensation power supply on a coil in the high-voltage relay, and a high-voltage output power limiting instruction is sent to the vehicle control unit, so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time (for example, 10ms), and the high-voltage relay is disconnected, so that a driver gradually stops along the side to perform power supply loop fault detection.
After the high voltage of the whole vehicle is reached and before the secondary fault code is not cleared, the battery pack management module 300 sets the fault flag bit to be 1 all the time and prohibits the high-voltage relay from being attracted again.
As another example, when the battery pack management module 300 performs a three-level fault alarm, it records a three-level fault code, concatenates flag bits, and detects whether a two-level fault occurs. If the secondary fault alarm is not detected, a high-voltage output power limiting instruction is sent to the vehicle control unit, so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time (for example, 10 ms). If the secondary fault is detected, the standby power supply module 200 is controlled to work to perform compensation power supply on a coil L1 in the high-voltage relay, and a high-voltage output power limiting instruction is sent to the vehicle control unit, so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time to disconnect the high-voltage relay.
After the high-voltage relay is disconnected and before the three-level fault code is not cleared, the battery pack management module 300 keeps the fault flag at 1 and prohibits the high-voltage relay from being attracted again.
Further, in the three types of faults, the response priority of the tertiary fault alarm is higher than that of the secondary fault alarm, and the response priority of the secondary fault alarm is higher than that of the primary fault alarm.
According to the control system for preventing the high-voltage relay from being adhered to generate the fault in the electric vehicle, the power supply voltage of the coil in the high-voltage relay is monitored in real time through the battery pack management module, the control of the standby power supply module is carried out according to fault classification and a specific control strategy, so that the standby power supply module is timely controlled to carry out compensation power supply for the coil in the high-voltage relay when the fault occurs, the adhesion of the high-voltage relay caused by the fact that the power supply voltage of the coil in the high-voltage relay is too low is prevented, and the safety of the vehicle can be improved.
Further, still another embodiment of the present application provides an electric vehicle including the control system for preventing the high-voltage relay from a sticking fault in the aforementioned electric vehicle.
Above-mentioned electric vehicle through the control system who prevents among the aforementioned electric vehicle that high voltage relay from taking place the adhesion trouble, can in time control reserve power module when breaking down and compensate the power supply for the coil among the high voltage relay, prevent to draw the supply voltage of coil among the high voltage relay and cross lowly arouse the adhesion of high voltage relay to can improve the security of vehicle.
As shown in fig. 4, another embodiment of the present application provides a control method for preventing a high-voltage relay from generating a sticking fault in an electric vehicle, where the electric vehicle is the aforementioned electric vehicle, and the control method includes the following steps:
and S101, detecting the power supply voltage of a coil in the high-voltage relay after the battery pack management module finishes power-on self-detection.
And S102, when the fact that the power supply voltage of the coil in the high-voltage relay is smaller than a first preset voltage value is detected, controlling the standby power supply module to work so as to supply power to the coil in the high-voltage relay in a compensation mode.
It should be noted that, for the description of the control method for preventing the high-voltage relay from generating the adhesion fault in the present application, please refer to the description of the control system for preventing the high-voltage relay from generating the adhesion fault in the present application, and details are not repeated here.
According to the control method for preventing the adhesion fault of the high-voltage relay in the electric vehicle, after the battery pack management module finishes power-on self-inspection, the power supply voltage of the coil in the high-voltage relay is detected, and when the power supply voltage of the coil in the high-voltage relay is detected to be smaller than a first preset voltage value, the standby power supply module is controlled to work, so that the coil in the high-voltage relay is compensated and powered, the situation that the adhesion of the high-voltage relay is caused due to the fact that the power supply voltage of the coil in the high-voltage relay is too low can be prevented, and the safety of the vehicle can be improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as 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. For example, 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.
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 do not necessarily 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, 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 of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
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 control system for preventing a high-voltage relay from generating an adhesion fault in an electric vehicle, comprising:
the input end of the first power supply conversion circuit is connected with the high-voltage power supply output end of the electric vehicle, the output end of the first power supply conversion circuit is connected with the first end of the coil in the high-voltage relay, and the first power supply conversion circuit is used for converting first direct current provided by the high-voltage power supply output end so as to supply power to the coil in the high-voltage relay;
the standby power supply module is used for converting first direct current provided by the high-voltage power supply output end so as to compensate and supply power to the coil in the high-voltage relay;
the battery package management module, the first end of battery package management module with the second end of coil links to each other in the high-voltage relay, the second end of battery package management module with the first end of coil links to each other in the high-voltage relay, the third end of battery package management module with reserve power module's control end links to each other, battery package management module is used for exporting low pressure control signal extremely the second end of coil in the high-voltage relay, so that on the coil in the high-voltage relay, the actuation high-voltage relay to detect control when the supply voltage of coil is less than first default voltage value in the high-voltage relay reserve power module carries out work, in order to right coil compensation power supply in the high-voltage relay.
2. The control system for preventing the high voltage relay from generating the sticking fault in the electric vehicle according to claim 1, wherein the battery pack management module detects the supply voltage at every preset time interval after the power-on self-test is completed, wherein,
when the power supply voltage is detected to drop for N times continuously and the minimum value of the power supply voltage in the detection results of the N times is smaller than a second preset voltage value, performing primary fault alarm and sending a primary fault alarm signal to the vehicle control unit, wherein N is an integer greater than or equal to 1, and the second preset voltage value is greater than the first preset voltage value;
and when the power supply voltage is detected to be smaller than the first preset voltage value, performing secondary fault alarm, and sending a secondary fault alarm signal to the vehicle control unit.
3. The control system for preventing the high-voltage relay from generating the adhesion fault in the electric vehicle as claimed in claim 2, wherein the battery pack management module performs a three-level fault alarm when receiving a vehicle collision signal and transmits the three-level fault alarm signal to the vehicle control unit.
4. The control system for preventing the high voltage relay from generating the sticking fault in the electric vehicle according to claim 2, wherein the battery pack management module records a primary fault code, unseats a flag bit, and judges whether the high voltage relay is engaged when performing a primary fault alarm, wherein,
and if the high-voltage relay is not attracted, outputting an attraction prohibition signal of the high-voltage relay to prevent the high-voltage relay from generating adhesion faults.
5. The control system for preventing the high voltage relay from generating the sticking fault in the electric vehicle according to claim 2, wherein the battery pack management module records a secondary fault code, unseats a flag bit, and judges whether the high voltage relay is engaged when the secondary fault alarm is performed, wherein,
if the high-voltage relay is not in suction, a suction prohibition signal of the high-voltage relay is output to prevent the high-voltage relay from generating adhesion fault;
and if the high-voltage relay is attracted, controlling the standby power supply module to work so as to perform compensation power supply on a coil in the high-voltage relay and sending a high-voltage output power limiting instruction to the vehicle control unit so as to enable the vehicle control unit to limit the high-voltage output power to be zero within a first preset time.
6. The control system for preventing the high-voltage relay from generating the adhesion fault in the electric vehicle according to claim 3, wherein when the battery pack management module performs a tertiary fault alarm, a tertiary fault code is recorded, a flag bit is collocated, and whether a secondary fault alarm is performed or not is detected;
if the secondary fault alarm is not detected, sending a high-voltage output power limiting instruction to the vehicle control unit so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time;
and if the secondary fault alarm is detected, controlling the standby power supply module to work so as to perform compensation power supply on a coil in the high-voltage relay and sending a high-voltage output power limiting instruction to the vehicle control unit, so that the vehicle control unit limits the high-voltage output power to be zero within a first preset time.
7. The control system for preventing a high-voltage relay from a sticking fault in an electric vehicle according to claim 3, wherein a response priority of the tertiary malfunction alarm is higher than a response priority of the secondary malfunction alarm, and a response priority of the secondary malfunction alarm is higher than a response priority of the primary malfunction alarm.
8. The control system for preventing the sticking failure of the high voltage relay in the electric vehicle according to any one of claims 1 to 7, wherein the backup power supply module comprises:
the input end of the second power supply conversion circuit is connected with the high-voltage power supply output end of the electric vehicle, and the second power supply conversion circuit is used for converting the first direct current provided by the high-voltage power supply output end;
the emergency relay, the one end of switch in the emergency relay with second power supply converting circuit's output links to each other, the other end of switch in the emergency relay with the first end of high-voltage relay coil links to each other, the one end of coil is connected to the low potential in the emergency relay, the other end of coil is as in the emergency relay reserve power module's control end, the emergency relay is used for disconnection or actuation under battery package management module's control to control whether second power supply converting circuit carries out work.
9. An electric vehicle characterized by comprising the control system for preventing the high-voltage relay from sticking failure in the electric vehicle according to any one of claims 1 to 8.
10. A control method for preventing a high-voltage relay from sticking failure in an electric vehicle, characterized in that the electric vehicle is the electric vehicle of claim 9, the control method comprising the steps of:
after the battery pack management module finishes power-on self-detection, detecting the power supply voltage of a coil in the high-voltage relay;
and when detecting that the power supply voltage of the coil in the high-voltage relay is smaller than a first preset voltage value, controlling the standby power supply module to work so as to compensate and supply power to the coil in the high-voltage relay.
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| CN202011604020.1A CN114696290A (en) | 2020-12-30 | 2020-12-30 | Control system for preventing high-voltage relay from generating adhesion fault in electric vehicle |
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| CN202011604020.1A CN114696290A (en) | 2020-12-30 | 2020-12-30 | Control system for preventing high-voltage relay from generating adhesion fault in electric vehicle |
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