CN114940098A - Double-storage-battery insufficient-power-preventing system and method and electric automobile - Google Patents
Double-storage-battery insufficient-power-preventing system and method and electric automobile Download PDFInfo
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
- B60L3/0023—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
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
- B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
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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
- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
- B60L2210/12—Buck converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The invention discloses a double-storage-battery power shortage prevention system and method and an electric automobile. In the process of supplementing the power to the auxiliary storage battery, when the SOC value of the main storage battery is larger than or equal to the preset power supplementing finishing SOC threshold value, the whole vehicle control unit enables the controlled end of the switch module to be disconnected, the power supplementing to the main storage battery is stopped, and the main storage battery can be effectively prevented from being overcharged.
Description
Technical Field
The invention belongs to the field of battery control of electric automobiles, and particularly relates to a double-storage-battery power shortage prevention system and method and an electric automobile.
Background
Reach the electric automobile that L3 level intelligent driving at present, in order to satisfy the functional safety requirement, all have two 12V batteries to carry out the low pressure power supply for all controllers of whole car, one is main battery, and one is auxiliary battery, and under main battery state normal condition, whole car low pressure power supply is accomplished by main battery, when main battery breaks down and can't supply power, is whole car low pressure power supply by auxiliary battery. With the increase of intelligent functions and intelligent equipment of the electric automobile, after the electric automobile is electrified under high voltage, the 12V storage battery is easy to lack of power due to the influence of dark current. At present, two methods for preventing power shortage are commonly used.
The first method is to add a voltage acquisition circuit, and when the voltage of a certain 12V storage battery is detected to be smaller than a set threshold value, the whole vehicle is powered off. The method can only prevent the electric quantity of the 12V storage battery from being consumed, and cannot solve the problem that a plurality of controllers need to continuously work in a low-power-consumption standby mode, so that a plurality of intelligent functions cannot be realized after the whole vehicle is subjected to high voltage.
And secondly, waking up the whole vehicle control unit at regular time, detecting any one 12V storage battery, electrifying at high voltage if the voltage of the 12V storage battery is lower than a set threshold value, and outputting fixed voltage to supplement electricity for the two 12V storage batteries. The method does not consider the situation that the 12V main storage battery is not lack of power, the 12V main storage battery is overcharged, the power is supplemented by fixed voltage, the power supplementing efficiency is low, and the energy consumption is high.
Disclosure of Invention
The invention aims to provide a double-storage-battery insufficient-power-supply-prevention system and method and an electric automobile, so that the main storage battery is ensured not to be overcharged while the double storage batteries are charged for a long time.
The double-storage-battery power-loss prevention system comprises a whole vehicle control unit, a vehicle-mounted T-BOX, a battery management system, a DCDC controller, a DCDC converter and a relay, wherein the vehicle-mounted T-BOX, the battery management system and the DCDC controller are in communication connection with the whole vehicle control unit through a CAN bus; the whole vehicle control unit is connected with the auxiliary storage battery, and the battery management system is connected with the power battery. The anti-power-shortage system also comprises an intelligent storage battery sensor and a switch module, wherein the intelligent storage battery sensor is connected with the main storage battery, the intelligent storage battery sensor is in communication connection with the whole vehicle control unit through a CAN bus, the controlled end of the switch module is connected between the DCDC converter and the main storage battery, and the control end of the switch module is connected with the whole vehicle control unit; the default state of the controlled end of the switch module is a closed state (that is, a line between the DCDC converter and the main battery is a path in the default state).
Among the above-mentioned two battery anti-shortage system: the vehicle-mounted T-BOX is mainly responsible for waking up a vehicle control unit regularly, and the auxiliary vehicle control unit realizes the regular detection of the voltage of the auxiliary storage battery. The switch module is mainly responsible for disconnecting a line between the DCDC converter and the main storage battery when the main storage battery is not required to be supplied with power. The DCDC controller is mainly responsible for controlling the output voltage (namely converting high voltage into low voltage) of the DCDC converter to supplement power for the main storage battery and the auxiliary storage battery. The battery management system is mainly responsible for controlling the on and off of the relay, realizing high-voltage power-on or low-voltage power-off, and simultaneously sending the current residual energy of the power battery to the whole vehicle control unit. The intelligent storage battery sensor is mainly responsible for detecting the SOC value of the main storage battery. The whole vehicle control unit is mainly responsible for system main control and logic operation, judges power supply starting and quitting conditions and coordinates other parts to work.
Preferably, the switch module can have two structural forms:
the first type is that the switch module is a controllable switch, the controlled end of the controllable switch is connected between the DCDC converter and the main storage battery, and the control end of the controllable switch is connected with the whole vehicle control unit. The switch module is applied to a scene that a vehicle control unit has enough pins and can directly output high and low level signals to control the opening/closing of a controllable switch.
And secondly, the switch module comprises a switch controller and a controllable switch, the controlled end of the controllable switch is connected between the DCDC converter and the main storage battery, the control end of the controllable switch is connected with the switch controller, and the switch controller is in communication connection with the whole vehicle control unit through a CAN bus. The switch module is applied to a scene that a finished automobile control unit does not have enough pins, a switch controller is required to be added to receive a control command of the finished automobile control unit, and the opening/closing of a controllable switch is controlled according to the control command of the finished automobile control unit.
The electric automobile comprises the double-storage-battery power shortage prevention system.
The invention discloses a double-storage-battery power shortage prevention method, which adopts the double-storage-battery power shortage prevention system and comprises the following steps:
the method comprises the steps that when the whole vehicle enters a dormant state, a main storage battery electricity shortage prevention function is triggered, an intelligent storage battery sensor is awakened at regular time, the SOC value of the main storage battery is detected and judged, and if the SOC value of the main storage battery is smaller than a preset electricity supplementing SOC threshold value, an electricity supplementing request of the main storage battery and the detected SOC value of the main storage battery are sent to a whole vehicle control unit.
The method comprises the steps that when the whole vehicle enters a dormant state, an auxiliary storage battery power shortage prevention function is triggered, the vehicle-mounted T-BOX awakens a whole vehicle control unit at regular time and sends an auxiliary storage battery voltage detection request to the whole vehicle control unit, the whole vehicle control unit detects and judges the voltage of the auxiliary storage battery after receiving the auxiliary storage battery voltage detection request, and if the voltage of the auxiliary storage battery is smaller than a preset power supply voltage threshold value, the auxiliary storage battery needs power supply.
When the whole vehicle control unit receives a main storage battery power supplementing request, judging whether a power supply gear of the whole vehicle is an OFF gear or not, if not, quitting the power shortage prevention function of the main storage battery, if so, judging whether a power supplementing starting condition is met or not, if so, requesting a battery management system to control a relay to be closed by the whole vehicle control unit, electrifying at high voltage, and requesting a DCDC controller to control the output voltage (namely converting the high voltage into low voltage) of a DCDC converter to be the power supplementing of the main storage battery; after high-voltage electrification, the intelligent storage battery sensor sends the detected SOC value of the main storage battery to a vehicle control unit in real time; in the process of supplementing power to the main storage battery, when the power supply gear of the whole vehicle is not an OFF gear, the function of preventing power shortage of the main storage battery is withdrawn, and when the condition of supplementing power to the main storage battery and withdrawing the main storage battery is met, the whole vehicle control unit requests the DCDC controller to control the DCDC converter to stop working, requests the battery management system to control the relay to be disconnected, and the whole vehicle is powered OFF at high voltage and sleeps.
When the whole vehicle control unit judges that the auxiliary storage battery needs to be supplied with power, whether a power supply gear of the whole vehicle is an OFF gear or not is judged, if not, the power shortage prevention function of the auxiliary storage battery is quitted, if yes, whether a power supply starting condition is met or not is judged, if yes, the whole vehicle control unit requests a battery management system to control a relay to be closed, high-voltage power is supplied, and a DCDC controller is requested to control the output voltage (namely, high-voltage power is converted into low-voltage power) of a DCDC converter to be supplied with power for the auxiliary storage battery; after high-voltage electrification, the intelligent storage battery sensor sends the detected SOC value of the main storage battery to the whole vehicle control unit in real time, and the whole vehicle control unit detects and judges the voltage of the auxiliary storage battery in real time; in the process of supplementing power to the auxiliary storage battery, when the power supply gear of the whole vehicle is a non-OFF gear, the auxiliary storage battery power shortage prevention function is quitted, when the SOC value of the main storage battery is larger than or equal to a preset power supplementing finishing SOC threshold value, the whole vehicle control unit enables the controlled end of the switch module to be disconnected (the power supplementing to the main storage battery is stopped corresponding to the fact that a circuit between the DCDC converter and the main storage battery is disconnected), and when the auxiliary storage battery power supplementing quitting condition is met, the whole vehicle control unit enables the controlled end of the switch module to be restored to a closed state, requests the DCDC controller to control the DCDC converter to stop working, requests the battery management system to control the relay to be disconnected, and the whole vehicle is powered down at high voltage and dormant.
Preferably, the timing time for the vehicle-mounted T-BOX to wake up the vehicle control unit at regular time is determined according to the voltage of the auxiliary battery received last time before the vehicle-mounted T-BOX goes to sleep (the voltage is sent to the vehicle-mounted T-BOX by the vehicle control unit), if the voltage is greater than or equal to a preset third voltage threshold, the timing time is determined to be a preset first time, if the voltage is greater than or equal to a preset fourth voltage threshold and less than a preset third voltage threshold, the timing time is determined to be a preset second time, and if the voltage is less than the preset fourth voltage threshold, the timing time is determined to be a preset third time; the preset first time is greater than the preset second time, and the preset second time is greater than the preset third time. The mode of setting the timing time can effectively avoid the problem that the vehicle-mounted T-BOX frequently wakes up to consume part of the electric quantity of the main storage battery, and can also meet the detection requirement of preventing power shortage.
Preferably, the entire vehicle control unit determines an output voltage request value of the DCDC converter according to the SOC value of the main storage battery, and sends the output voltage request value of the DCDC converter to the DCDC controller, so that the DCDC controller controls the DCDC converter to output voltage according to the output voltage request value; the initial value of the output voltage request value of the DCDC converter is a preset first voltage threshold value, the output voltage request value of the DCDC converter decreases along with the increase of the SOC value of the main storage battery, but the output voltage request value of the DCDC converter is larger than a preset second voltage threshold value, and the preset second voltage threshold value is smaller than the preset first voltage threshold value. The method for adjusting the output voltage request value of the DCDC converter can improve the compensation efficiency and reduce the compensation energy consumption. If the controlled end of the switch module is in an off state, the output voltage request value of the DCDC converter is a preset fifth voltage threshold value; the preset fifth voltage threshold is greater than the preset second voltage threshold and less than the preset first voltage threshold.
If the conditions 1a and 1b are simultaneously met, the condition that the power supply starting condition is met is shown; wherein:
condition 1a is: the current residual energy of the power battery is larger than a preset first energy threshold value;
condition 1b is: there is no fault that prohibits the high voltage power-up.
If any condition in the conditions 2 a-2 d is met, the main storage battery power supply withdrawing condition is met; wherein:
condition 2a is: the current residual energy of the power battery is smaller than a preset second energy threshold;
condition 2b is: there is a fault requiring a high voltage down;
condition 2c is: the SOC value of the main storage battery is greater than or equal to a preset power supplementing finishing SOC threshold value;
condition 2d is: the power supply duration is greater than or equal to a preset power supply duration threshold;
if any condition in the conditions 3 a-3 c is met, the condition that the auxiliary storage battery is supplemented with electricity and quit is met; wherein the content of the first and second substances,
condition 3a is: the current residual energy of the power battery is smaller than a preset second energy threshold;
condition 3b is: there is a fault requiring a high voltage down;
condition 3c is: the power supply duration is greater than or equal to a preset power supply duration threshold.
The preset second energy threshold is smaller than the preset first energy threshold.
The power supply starting condition requires that the current residual energy of the power battery is larger than a preset first energy threshold, the power supply needs to be quitted when the current residual energy of the power battery is smaller than a preset second energy threshold, and the preset second energy threshold is smaller than the preset first energy threshold. The condition is favorable for ensuring that the power battery has enough energy to meet the electricity supplementing requirements of the main storage battery and the auxiliary storage battery, and the condition that the electric quantity of the power battery is exhausted for supplementing electricity to the main storage battery and the auxiliary storage battery is effectively avoided.
The limitation of the electricity supplementing time is designed in the condition of electricity supplementing quit, so that the excessive electricity supplementing when invalid electricity supplementing and faults occur can be avoided.
The timing time of regularly awakening the intelligent storage battery sensor is 30min, the intelligent storage battery sensor is awakened once every 30min, the problem that the intelligent storage battery sensor is frequently awakened to consume part of the electric quantity of the main storage battery can be effectively avoided, and the detection requirement for preventing power shortage can be met.
The preset power supply SOC threshold value is 60%, and the problems of frequent power supply and incapability of starting the whole vehicle can be avoided. The preset power supply voltage threshold is 12V, so that the problems of frequent power supply and incapability of starting the whole vehicle can be solved.
The preset power supply finishing SOC threshold value is 90%, the overlong power supply time can be avoided, the power supply efficiency of the last 10% SOC is not high, and the energy consumption can be effectively optimized.
The preset first energy threshold is 4 kw.h, and the preset second energy threshold is 3 kw.h, so that the power battery can have enough energy to meet the power supplementing requirements of the main storage battery and the auxiliary storage battery, and the condition that the electric quantity of the power battery is exhausted in order to supplement the power for the main storage battery and the auxiliary storage battery is effectively avoided.
The preset electricity supplementing time threshold is 30min, so that invalid electricity supplementing can be avoided under the condition that the main storage battery and/or the auxiliary storage battery cannot supplement electricity.
The invention has the following effects:
(1) the timing awakening and detecting method for detecting the SOC value of the main storage battery is used as a detection method for preventing power shortage, so that the situation that the main storage battery and the auxiliary storage battery are power-deficient can be avoided under the situation that the power battery is powered, the problem that the vehicle cannot be started after being parked for a long time is solved, and various intelligent functions can be continuously used during the parking of the vehicle.
(2) In the process of supplementing the power to the auxiliary storage battery, when the SOC value of the main storage battery is larger than or equal to the preset power supplementing finishing SOC threshold value, the whole vehicle control unit enables the controlled end of the switch module to be disconnected, the power supplementing to the main storage battery is stopped, the overcharge of the main storage battery is effectively avoided, and the service life of the main storage battery is prolonged by about 20%.
(3) Compared with the mode that the output voltage request value of the DCDC converter is fixed and unchanged, the fast and efficient power supplementing function is realized by adjusting the output voltage request value of the DCDC converter, the power supplementing time can be effectively reduced by about 10%, and the energy loss is reduced by about 6%.
Drawings
Fig. 1 is an architecture diagram of a double battery brown-out prevention system in embodiment 1.
Fig. 2 is a flowchart of a method for preventing a loss of power of a main battery in embodiment 1.
Fig. 3 is a flowchart of a method for preventing a power shortage of the auxiliary battery in embodiment 1.
Fig. 4 is an architecture diagram of a double battery power shortage prevention system in embodiment 2.
Fig. 5 is a flowchart of a method for preventing a power shortage of the auxiliary battery in embodiment 2.
Detailed Description
Example 1: the double-battery power shortage prevention system shown in fig. 1 comprises a vehicle-mounted T-BOX 1, a vehicle control unit (i.e., VCU) 2, a battery management system (i.e., BMS) 3, a DCDC controller 4, a DCDC converter 5, an intelligent battery sensor (i.e., IBS) 6, a relay 7 (which is a normally open relay), and a switch module, wherein the switch module is a controllable switch 81 (such as a relay, a MOS transistor, and the like). The vehicle-mounted T-BOX 1, the vehicle control unit 2, the battery management system 3, the DCDC controller 4 and the intelligent storage battery sensor 6 are in communication connection through a CAN bus. The DCDC controller 4 is connected with the DCDC converter 5, the DCDC converter 5 is connected with the auxiliary storage battery, the DCDC converter 5 is connected with the main storage battery through the controlled end of the controllable switch 81, the intelligent storage battery sensor is connected with the main storage battery, the whole vehicle control unit 2 is connected with the auxiliary storage battery and the control end of the controllable switch 81, the controlled end of the relay 7 is connected between the power battery and the DCDC converter 5, the control end of the relay 7 is connected with the battery management system 3, and the battery management system 3 is connected with the power battery. The default state of the controlled terminal of the controllable switch 81 is a closed state (i.e., the line between the DCDC converter 5 and the main battery is a path in the default state).
Among the above-mentioned two battery anti-shortage system: the vehicle-mounted T-BOX 1 is mainly responsible for waking up the whole vehicle control unit 2 at regular time, and the auxiliary whole vehicle control unit 2 realizes the regular detection of the voltage of the auxiliary storage battery. The controllable switch 81 is mainly responsible for disconnecting the line between the DCDC converter 5 and the main battery when there is no need to replenish the main battery. The DCDC controller 4 is mainly responsible for controlling the output voltage (i.e. converting high voltage into low voltage) of the DCDC converter 5 to supplement power for the main storage battery and the auxiliary storage battery. The battery management system 3 is mainly responsible for controlling the on and off of the relay 7, realizing high-voltage power-on or high-voltage power-down, and simultaneously sending the current residual energy of the power battery to the vehicle control unit 2. The intelligent battery sensor 6 is mainly responsible for detecting the SOC value of the main battery. The vehicle control unit 2 is mainly responsible for system main control and logic operation, judges power supply starting and quitting conditions and coordinates other parts to work.
The double-storage-battery insufficient-power-preventing method in the embodiment adopts the double-storage-battery insufficient-power-preventing system, and comprises a main storage battery insufficient-power-preventing method and an auxiliary storage battery insufficient-power-preventing method. When the whole vehicle enters a dormant state, the electricity shortage prevention function of the main storage battery and the electricity shortage prevention function of the auxiliary storage battery can be triggered.
As shown in fig. 2, the method for preventing the power shortage of the main battery includes:
and S101, the intelligent storage battery sensor 6 is self-awakened once at a timing of 30min, after awakening, the SOC value of the main storage battery is detected, and then S102 is executed.
Step S102, the intelligent storage battery sensor 6 judges whether the SOC value of the main storage battery is less than 60%, if so, the step S103 is executed, otherwise, the step S101 is executed again, and the self-awakening is continuously carried out for 30min at regular time.
Step S103, the intelligent storage battery sensor 6 sends the main storage battery power supplement request and the detected SOC value of the main storage battery to the entire vehicle control unit 2, and then step S104 is executed.
And step S104, when the whole vehicle control unit 2 receives the main storage battery power supply supplement request, judging whether the power supply gear of the whole vehicle is an OFF gear, if so, executing step S105, and otherwise, executing step S112.
And step S105, the whole vehicle control unit 2 judges whether a power supply starting condition is met, if so, step S107 is executed, and otherwise, step S106 is executed. If the conditions 1a and 1b are satisfied at the same time, it means that the condition for starting the power supply is satisfied. Condition 1a is: the current residual energy of the power battery is more than 4 kw.h; condition 1b is: there is no fault that prohibits the high voltage power-up.
And S106, the whole vehicle control unit 2 and the intelligent storage battery sensor 6 are in sleep, and then the step S101 is executed.
And step S107, the whole vehicle control unit 2 requests the battery management system 3 to control the relay 7 to be closed, high-voltage electrification is carried out, and then step S108 is executed.
Step S108, the vehicle control unit 2 requests the DCDC controller 4 to control the DCDC converter 5 to output voltage (i.e., convert high voltage into low voltage) to supplement power for the main battery, and then step S109 is executed. After high-voltage electrification, the intelligent storage battery sensor 6 sends the detected SOC value of the main storage battery to the whole vehicle control unit 2 in real time.
The concrete mode that the whole vehicle control unit 2 requests the DCDC controller 4 to control the output voltage of the DCDC converter 5 to supplement power for the main storage battery is as follows: the whole vehicle control unit 2 determines an output voltage request value of the DCDC converter according to the SOC value of the main storage battery, and sends the output voltage request value of the DCDC converter to the DCDC controller 4, so that the DCDC controller 4 controls the DCDC converter 5 to output voltage according to the output voltage request value; the initial value of the output voltage request value of the DCDC converter is a preset first voltage threshold (in this embodiment, the preset first voltage threshold is 15V), the output voltage request value of the DCDC converter decreases with the increase of the SOC value of the main battery, and the output voltage request value of the DCDC converter decreases by 0.2V every 5% increase of the SOC value of the main battery, but the output voltage request value of the DCDC converter should be greater than a preset second voltage threshold (in this embodiment, the preset second voltage threshold is 13.6V). The power compensation efficiency can be improved, and the power compensation energy consumption can be reduced.
And step S109, the whole vehicle control unit 2 judges whether the power supply gear of the whole vehicle is an OFF gear, if so, step S110 is executed, otherwise, step S112 is executed.
And step S110, the whole vehicle control unit 2 judges whether a main storage battery power-supplementing exit condition is met, if so, the step S111 is executed, and if not, the step S108 is executed. Wherein, if any condition in the conditions 2a to 2d is satisfied, the main storage battery power supply withdrawing condition is satisfied. Condition 2a is: the current residual energy of the power battery is less than 3 kw.h; condition 2b is: there is a fault requiring a high voltage down; condition 2c is: the SOC value of the main storage battery is greater than or equal to 90%; condition 2d is: the power supplementing time is more than or equal to 30 min.
And S111, the whole vehicle control unit 2 requests the DCDC controller 4 to control the DCDC converter 5 to stop working, requests the battery management system 3 to control the relay 7 to be disconnected, and stops the power supply under high voltage and the whole vehicle to sleep, and then the operation is finished.
And step S112, exiting the main storage battery power shortage prevention function, and then ending.
As shown in fig. 3, the method for preventing the insufficient power of the auxiliary battery includes:
step S201, the vehicle-mounted T-BOX 1 is self-awakened once at regular time, the whole vehicle control unit 2 is awakened after self-awakening, the auxiliary storage battery voltage detection request is sent to the whole vehicle control unit 2, and then step S202 is executed.
The timing time for the vehicle-mounted T-BOX 1 to wake up automatically at regular time (also the timing time for the vehicle-mounted T-BOX to wake up the whole vehicle control unit at regular time) is determined according to the voltage of the auxiliary storage battery received last before the vehicle-mounted T-BOX sleeps (the voltage is sent to the vehicle-mounted T-BOX by the whole vehicle control unit 2). The method specifically comprises the following steps: if the voltage of the auxiliary battery received last time before the sleep of the vehicle T-BOX is greater than or equal to the preset third voltage threshold (in this embodiment, the preset third voltage threshold is 12.5V), the timing time is determined to be the preset first time (in this embodiment, the preset first time is 120 h), if the voltage of the auxiliary battery received last time before the sleep of the vehicle T-BOX is greater than or equal to the preset fourth voltage threshold (in this embodiment, the preset fourth voltage threshold is 12V) and is less than the preset third voltage threshold, the timing time is determined to be the preset second time (in this embodiment, the preset second time is 72 h), if the voltage of the auxiliary battery received last time before the sleep of the vehicle T-BOX is less than the preset fourth voltage threshold, the timing time is determined to be the preset third time (in this embodiment, the preset third time is 48 h).
Step S202, after receiving the auxiliary battery voltage detection request, the entire vehicle control unit 2 detects the voltage of the auxiliary battery, and then executes step S203.
And step S203, the whole vehicle control unit 2 judges whether the voltage of the auxiliary storage battery is less than 12V, if so, the step S204 is executed, and if not, the step S201 is executed again.
Step S204, the vehicle control unit 2 determines that the auxiliary battery needs to be recharged, and then executes step S205.
Step S205, the entire vehicle control unit 2 determines whether the power supply gear of the entire vehicle is OFF gear, if yes, step S206 is executed, otherwise step S215 is executed.
Step S206, the vehicle control unit 2 determines whether the condition for starting the power supply is satisfied, if so, step S208 is executed, otherwise, step S207 is executed. If the conditions 1a and 1b are satisfied at the same time, it means that the condition for starting the power supply is satisfied. Condition 1a is: the current residual energy of the power battery is more than 4 kw.h; condition 1b is: there is no fault that prohibits the high voltage power-up.
And step S207, the vehicle control unit 2 and the vehicle T-BOX 1 are in sleep, and then the step S201 is executed.
Step S208, the vehicle control unit 2 requests the battery management system 3 to control the relay 7 to be closed, and the high-voltage power supply is performed, and then step S209 is performed.
In step S209, the vehicle control unit 2 requests the DCDC controller 4 to control the DCDC converter 5 to output voltage (i.e., convert high voltage into low voltage) to supplement power for the auxiliary battery, and then executes step S210. After high-voltage electrification, the intelligent storage battery sensor 6 sends the detected SOC value of the main storage battery to the whole vehicle control unit 2 in real time, and the whole vehicle control unit 2 detects and judges the voltage of the auxiliary storage battery in real time.
The specific way that the whole vehicle control unit 2 requests the DCDC controller 4 to control the output voltage of the DCDC converter 5 to supplement the power for the auxiliary storage battery is as follows: the whole vehicle control unit 2 determines an output voltage request value of the DCDC converter according to the SOC value of the main storage battery, and sends the output voltage request value of the DCDC converter to the DCDC controller 4, so that the DCDC controller 4 controls the DCDC converter 5 to output voltage according to the output voltage request value; the initial value of the output voltage request value of the DCDC converter is 15V, the output voltage request value of the DCDC converter decreases with the increase of the SOC value of the main battery, and the output voltage request value of the DCDC converter decreases by 0.2V every 5% increase of the SOC value of the main battery, but the output voltage request value of the DCDC converter should be larger than 13.6V. If the controlled terminal of the controllable switch 81 is in the off state, the output voltage request value of the DCDC converter is the preset fifth voltage threshold (in this embodiment, the preset fifth voltage threshold is 14.5V).
Step S210, the entire vehicle control unit 2 determines whether the power supply gear of the entire vehicle is OFF gear, if yes, step S211 is executed, otherwise step S215 is executed.
Step S211, the entire vehicle control unit 2 determines whether the SOC value of the main battery is greater than or equal to 90%, if so, step S212 is executed, otherwise, step S213 is executed.
In step S212, the vehicle control unit 2 controls the controlled terminal of the controllable switch 81 to be disconnected (corresponding to the line between the DCDC converter 5 and the main battery being disconnected, the power supply to the main battery is stopped), and then step S213 is executed.
And step S213, the vehicle control unit 2 judges whether the auxiliary storage battery power supply exit condition is met, if so, the step S214 is executed, and if not, the step S209 is executed. Wherein, if any condition in the conditions 3 a-3 c is satisfied, the condition of auxiliary storage battery power supply and exit is satisfied. Condition 3a is: the current residual energy of the power battery is less than 3 kw.h; condition 3b is: there is a fault requiring a high voltage down; condition 3c is: the power supplementing time is more than or equal to 30 min.
And S214, the vehicle control unit 2 controls the controlled end of the controllable switch 81 to recover the closed state, requests the DCDC controller 4 to control the DCDC converter 5 to stop working, requests the battery management system 3 to control the relay 7 to be disconnected, and stops the vehicle when the vehicle is powered off at high voltage and sleeps.
And S215, exiting the auxiliary storage battery power shortage prevention function, and then ending.
The present embodiment also provides an electric vehicle including a dual battery power shortage prevention system as shown in fig. 1.
Example 2: as shown in fig. 4, the double-battery power shortage prevention system in the present embodiment has the same most structure as that in embodiment 1, except that: the switch module comprises a switch controller 82 and a controllable switch 81, a controlled end of the controllable switch 81 is connected between the DCDC converter 5 and the main storage battery, a control end of the controllable switch 81 is connected with the switch controller 82, and the switch controller 82 is in communication connection with the whole vehicle control unit 2 through a CAN bus.
The double-storage-battery insufficient-power-preventing method in the embodiment adopts the double-storage-battery insufficient-power-preventing system, and most steps of the double-storage-battery insufficient-power-preventing method are the same as those in embodiment 1. As shown in fig. 5, the difference is that: in step S212, the entire vehicle control unit 2 sends a controllable switch off control command to the switch controller 82, and the switch controller 82 controls the controlled terminal of the controllable switch 81 to be turned off. In step S214, the entire vehicle control unit 2 sends a close state restoration control command to the switch controller 82, and the switch controller 82 controls the controlled terminal of the controllable switch 81 to restore the close state.
The present embodiment also provides an electric vehicle including a dual battery power shortage prevention system as shown in fig. 4.
Claims (10)
1. A double-storage-battery power-loss-prevention system comprises a whole vehicle control unit (2), a vehicle-mounted T-BOX (1), a battery management system (3), a DCDC controller (4), a DCDC converter (5), a relay (7), wherein the vehicle-mounted T-BOX (1), the battery management system (3) and the DCDC controller (4) are in communication connection with the whole vehicle control unit (2) through a CAN bus, the DCDC converter (5) is connected with the DCDC controller (4) and an auxiliary storage battery, and a controlled end is connected between a power battery and the DCDC converter (5) and a control end is connected with the battery management system (3); the whole vehicle control unit (2) is connected with an auxiliary storage battery, and the battery management system (3) is connected with a power battery; the method is characterized in that: the intelligent storage battery sensor (6) is connected with a main storage battery, the intelligent storage battery sensor (6) is in communication connection with the whole vehicle control unit (2) through a CAN bus, the controlled end of the switch module is connected between the DCDC converter (5) and the main storage battery, and the control end of the switch module is connected with the whole vehicle control unit (2); the default state of the controlled end of the switch module is a closed state.
2. The dual battery brown-out prevention system of claim 1, wherein: the switch module is a controllable switch (81), the controlled end of the controllable switch (81) is connected between the DCDC converter (5) and the main storage battery, and the control end of the controllable switch (81) is connected with the whole vehicle control unit (2).
3. The dual battery brown-out prevention system of claim 1, wherein: the switch module comprises a switch controller (82) and a controllable switch (81), the controlled end of the controllable switch (81) is connected between the DCDC converter (5) and the main storage battery, the control end of the controllable switch (81) is connected with the switch controller (82), and the switch controller (82) is in communication connection with the whole vehicle control unit (2) through a CAN bus.
4. An electric vehicle, characterized in that: comprising a dual battery underrun protection system according to any of claims 1 to 3.
5. A double-storage-battery power shortage prevention method is characterized by comprising the following steps: a double battery system for preventing loss of electric power using the double battery according to any one of claims 1 to 3, the method comprising:
when the whole vehicle enters a dormant state, triggering a main storage battery power shortage prevention function, awakening an intelligent storage battery sensor (6) at regular time, detecting and judging the SOC value of the main storage battery, and sending a main storage battery power supply request and the detected SOC value of the main storage battery to a whole vehicle control unit (2) if the SOC value of the main storage battery is smaller than a preset power supply SOC threshold value;
the method comprises the steps that when a whole vehicle enters a dormant state, an auxiliary storage battery power shortage prevention function is triggered, a vehicle-mounted T-BOX (1) wakes up a whole vehicle control unit (2) at regular time and sends an auxiliary storage battery voltage detection request to the whole vehicle control unit (2), the whole vehicle control unit (2) detects and judges the voltage of the auxiliary storage battery after receiving the auxiliary storage battery voltage detection request, and if the voltage of the auxiliary storage battery is smaller than a preset power supply voltage threshold value, the auxiliary storage battery is judged to need power supply;
when the whole vehicle control unit (2) receives a main storage battery power supplementing request, whether a power supply gear of the whole vehicle is an OFF gear or not is judged, if not, the function of preventing power shortage of the main storage battery is quitted, if yes, whether a power supplementing starting condition is met or not is judged, if yes, the whole vehicle control unit (2) requests a battery management system (3) to control a relay (7) to be closed, high-voltage electrification is performed, and a DCDC controller (4) is requested to control the output voltage of a DCDC converter (5) to supplement power for the main storage battery; in the process of supplementing power to the main storage battery, when the power supply gear of the whole vehicle is a non-OFF gear, the power shortage prevention function of the main storage battery is quitted, when the condition of supplementing power to the main storage battery and quitting the power supply gear is met, the whole vehicle control unit (2) requests the DCDC controller (4) to control the DCDC converter (5) to stop working, and requests the battery management system (3) to control the relay (7) to be disconnected, and the whole vehicle is powered OFF at high voltage and sleeps;
when the whole vehicle control unit (2) judges that the auxiliary storage battery needs to be supplied with power, whether the power supply gear of the whole vehicle is an OFF gear or not is judged, if not, the power shortage prevention function of the auxiliary storage battery is quitted, if yes, whether the power supply starting condition is met or not is judged, if yes, the whole vehicle control unit (2) requests the battery management system (3) to control the relay (7) to be closed, the high-voltage power is supplied, and the DCDC controller (4) is requested to control the output voltage of the DCDC converter (5) to be supplied with power for the auxiliary storage battery; in the process of supplementing power to the auxiliary storage battery, when the power supply gear of the whole vehicle is not an OFF gear, the auxiliary storage battery power shortage prevention function is quitted, when the SOC value of the main storage battery is larger than or equal to a preset power supplementing ending SOC threshold value, the whole vehicle control unit (2) enables the controlled end of the switch module to be disconnected, when the auxiliary storage battery power supplementing quitting condition is met, the whole vehicle control unit (2) enables the controlled end of the switch module to be recovered to a closed state, the DCDC controller (4) is requested to control the DCDC converter (5) to stop working, the battery management system (3) is requested to control the relay (7) to be disconnected, the power is turned OFF at high voltage, and the whole vehicle is in a dormant state.
6. The double battery power shortage prevention method according to claim 5, characterized in that:
the timing time for the vehicle-mounted T-BOX (1) to wake up the whole vehicle control unit (2) at regular time is determined according to the voltage of the auxiliary storage battery received last time before the vehicle-mounted T-BOX is dormant, if the voltage is greater than or equal to a preset third voltage threshold, the timing time is determined to be a preset first time, if the voltage is greater than or equal to a preset fourth voltage threshold and smaller than a preset third voltage threshold, the timing time is determined to be a preset second time, and if the voltage is smaller than the preset fourth voltage threshold, the timing time is determined to be a preset third time; the preset first time is greater than the preset second time, and the preset second time is greater than the preset third time.
7. The double battery power shortage prevention method according to claim 5, characterized in that: the whole vehicle control unit (2) determines an output voltage request value of the DCDC converter (5) according to the SOC value of the main storage battery, and sends the output voltage request value of the DCDC converter (5) to the DCDC controller (4), so that the DCDC controller (4) controls the DCDC converter (5) to output voltage according to the output voltage request value; the initial value of the output voltage request value of the DCDC converter (5) is a preset first voltage threshold value, the output voltage request value of the DCDC converter (5) decreases along with the increase of the SOC value of the main storage battery, but the output voltage request value of the DCDC converter (5) is larger than a preset second voltage threshold value, and the preset second voltage threshold value is smaller than the preset first voltage threshold value.
8. The double battery power shortage prevention method according to claim 7, characterized in that: if the controlled end of the switch module is in an off state, the output voltage request value of the DCDC converter (5) is a preset fifth voltage threshold value; the preset fifth voltage threshold is greater than the preset second voltage threshold and less than the preset first voltage threshold.
9. Double battery deficit prevention method according to any of claims 5 to 8, characterized in that:
if the conditions 1a and 1b are simultaneously met, the condition that the power supply starting condition is met is shown; wherein:
condition 1a is: the current residual energy of the power battery is larger than a preset first energy threshold value;
condition 1b is: no fault prohibiting high voltage power-up;
if any condition in the conditions 2 a-2 d is met, the condition that the main storage battery is compensated and the condition that the main storage battery is withdrawn is met; wherein:
condition 2a is: the current residual energy of the power battery is smaller than a preset second energy threshold;
condition 2b is: there is a fault requiring a high voltage down;
condition 2c is: the SOC value of the main storage battery is greater than or equal to a preset power supplementing finishing SOC threshold value;
condition 2d is: the power supply duration is greater than or equal to a preset power supply duration threshold;
if any condition in the conditions 3 a-3 c is met, the condition that the auxiliary storage battery is supplemented with electricity and quit is met; wherein, the first and the second end of the pipe are connected with each other,
condition 3a is: the current residual energy of the power battery is smaller than a preset second energy threshold value;
condition 3b is: there is a fault requiring a high voltage down;
condition 3c is: the power supply duration is greater than or equal to a preset power supply duration threshold;
the preset second energy threshold is smaller than the preset first energy threshold.
10. The double battery power shortage prevention method according to claim 9, characterized in that:
the timing time of timing awakening of the intelligent storage battery sensor (6) is 30min, the preset electricity supplementing SOC threshold value is 60%, the preset electricity supplementing voltage threshold value is 12V, the preset electricity supplementing finishing SOC threshold value is 90%, the preset first energy threshold value is 4 kw.h, the preset second energy threshold value is 3 kw.h, and the preset electricity supplementing time length threshold value is 30 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117799492A (en) * | 2023-09-15 | 2024-04-02 | 宁德时代(上海)智能科技有限公司 | Vehicle, and compensation control method, device, vehicle-mounted controller and storage medium thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117799492A (en) * | 2023-09-15 | 2024-04-02 | 宁德时代(上海)智能科技有限公司 | Vehicle, and compensation control method, device, vehicle-mounted controller and storage medium thereof |
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