CN112009246A - Automobile auxiliary power supply management system and control method - Google Patents
Automobile auxiliary power supply management system and control method Download PDFInfo
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- CN112009246A CN112009246A CN202010812971.1A CN202010812971A CN112009246A CN 112009246 A CN112009246 A CN 112009246A CN 202010812971 A CN202010812971 A CN 202010812971A CN 112009246 A CN112009246 A CN 112009246A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- 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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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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
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an automobile auxiliary power supply management system and a control method, wherein the system comprises a battery pack, a DCDC converter, a low-voltage storage battery and a VCU, the battery pack is connected with the low-voltage storage battery through the DCDC converter, the VCU is connected with a control end of the DCDC converter, an output end of the DCDC converter is connected with a current sensor in series, an output end of the current sensor is connected with the VCU, and an output end of the VCU is connected with a fault alarm module. According to the invention, the current sensor added to the system can alarm the current fault in the DCDC working process, and the whole vehicle DCDC charging safety management is improved.
Description
Technical Field
The invention relates to the field of automobile battery management control, in particular to an automobile auxiliary power supply management system and a control method.
Background
And the auxiliary power supply management module is responsible for controlling the DCDC converter and controlling the DCDC high-voltage relay, the enabling state and the working voltage according to the state of the whole vehicle and the state of the low-voltage battery. In the non-READY state, the VCU needs to control DCDC enable according to the low-voltage battery voltage. After READY, the VCU directly controls DCDC enable. And in a charging state, the VCU directly controls the DCDC to enable, and after the wake-up signal is invalid, whether the DCDC is enabled or not is determined according to the power-on mode of the whole vehicle. The VCU needs to control the DCDC enable, adjust the DCDC low-voltage output value, judge the DCDC mode, diagnose the DCDC low-voltage charging fault and the DCDC short-circuit overcurrent fault and the like according to conditions.
The prior art has the defects that:
1. the traditional automobile auxiliary power supply management system is not perfect in design in the aspects of functions, cost and the like.
2. The conventional management and control method of the auxiliary power supply of the automobile needs to be optimized in terms of control and fault diagnosis.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automobile auxiliary power supply management system and a control method, which are used for improving and optimizing the management control system and the method in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an automobile auxiliary power supply management system, includes battery package, DCDC converter, low pressure battery, VCU, the battery package passes through the DCDC converter and connects low pressure battery, the control end of DCDC converter is connected to VCU, the output of DCDC converter concatenates and sets up current sensor, VCU is connected to current sensor's output, fault alarm module is connected to the VCU output.
The DCDC converter is connected with the control end of the VCU through a CAN line and used for controlling the DCDC converter to convert the voltage of the battery pack into the charging voltage of the low-voltage storage battery.
The VCU is connected with the low-voltage battery charging indication module.
The VCU detects temperature data of the DCDC converter through a temperature sensor.
The battery pack comprises a battery pack, a main positive relay, a main negative relay, a pre-charging relay and a pre-charging resistor, wherein the main positive relay and the main negative relay are respectively arranged on positive and negative output terminals of the battery pack, the pre-charging resistor and the pre-charging relay are connected in series and then connected in parallel at two ends of the main positive relay, and the main positive relay, the main negative relay and the pre-charging relay are respectively connected with a VCU (vertical control Unit).
The system further comprises a battery pack switch MSD, wherein the battery pack switch MSD is connected in series in the battery pack and used for controlling connection between the battery packs, and the battery pack switch comprises a voltage fuse and a high-voltage circuit breaker which are connected in series.
The method comprises the step of judging and managing the DCDC fault, wherein a VCU enables the DCDC to work, detects the voltage and current values of the DCDC during low-voltage charging, and judges the voltage and current values to give a fault alarm.
The method further comprises a DCDC enable control step: the VCU is used for controlling the enabling of the DCDC converter, and when the main positive relay and the main negative relay are closed, the temperature of the DCDC converter is lower than a DCDC enabling temperature threshold value, and the DCDC has no system fault, the VCU sends a DCDC enabling command if any one of the following conditions is met:
1) the PowerMode mode is Charge;
2) the vehicle enters a READY state;
3) and the PowerMode signal is in an On state, the vehicle is in a non-READY state, and the voltage of the low-voltage storage battery is lower than a DCDC enabling voltage threshold value.
The DCDC enable control step further includes: the VCU controls the DCDC to quit the enable working state, and when any one of the following conditions is met, the VCU controls the DCDC to quit the enable:
1) detecting that the DCDC low-voltage charging fault is True, and the duration time is greater than a set time threshold;
2) detecting that the DCDC short-circuit overcurrent fault is True, wherein the duration time is greater than a set time threshold;
3) detecting that the DCDC has a True fault and the duration time is greater than a set time threshold;
4) the PowerMode signal is in an Off state, and the duration time is greater than a set time threshold;
5) detecting that the DCDC temperature exceeds a threshold value of the DCDC enable prohibition temperature and the duration is greater than a set time threshold value;
6) the main relay is in an off state and the duration time is greater than a set time threshold.
The method further comprises a DCDC low-voltage output control step:
1) when the DCDC is not enabled, the DCDC low-voltage output request voltage value is 0V, and the valid bit of the DCDC low-voltage output voltage value is invalid;
2) after the DCDC is enabled, the DCDC low-voltage output request voltage value is determined by table look-up according to the DCDC low-voltage output current; if the DCDC temperature exceeds the power limit temperature threshold, limiting the DCDC output power, and adjusting the DCDC low-voltage output request voltage value to be a limit voltage value; when the DCDC temperature is reduced to the threshold value of the limitation-free temperature, the DCDC low-voltage output request voltage value is subjected to table lookup determination according to the DCDC low-voltage output current;
3) and if the voltage value of the DCDC low-voltage output request is greater than 0V, the effective bit of the DCDC low-voltage output voltage value is valid.
The invention has the advantages that:
1. the invention designs an automobile auxiliary power supply management system, wherein an MSD (battery pack switch) is arranged in a power battery, and the switch is formed by connecting a high-voltage fuse and a high-voltage breaker in series. When the power battery fails, the high-voltage fuse is disconnected when the current exceeds a certain limit value. When the high-voltage circuit breaker is overhauled, the high-voltage circuit breaker can be manually disconnected, the internal circuit of the battery pack is cut off, and the safety is greatly improved.
2. The automobile auxiliary power supply management system designed by the invention is provided with the pre-charging relay and the pre-charging resistor at the port of the high-voltage power battery, so that the main positive relay is better protected, a pre-charging environment is provided for high-voltage components needing pre-charging, safety is realized, and cost is saved.
3. The automobile auxiliary power supply management system designed by the invention is additionally provided with the current sensor at the DCDC output end, and whether the DCDC has the overcurrent fault or not is judged by detecting the DCDC output current, so that the safety is improved.
4. A more perfect control method is designed to control the enabling and the quitting of the DCDC, and the safety and the control efficiency are improved.
5. A DCDC protection mode is designed, namely in different working environments, the voltage output by the DCDC is slightly different, and the service life of the DCDC and the stability of a system are improved.
6. A low-voltage battery charging indication is designed, so that the influence on the service life of the battery and the normal work of low-voltage accessories caused by over-discharge of the low-voltage battery is avoided.
7. The designed DCDC fault diagnosis method comprises the following steps: low voltage charging faults and short circuit overcurrent faults. The safety and the stability of the system are improved.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
fig. 1 is a schematic diagram of the structure of the management system of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
As shown in fig. 1, an auxiliary power management system for a vehicle includes: the high-voltage power battery pack comprises a battery pack, a battery pack maintenance switch, a main relay, a pre-charging relay and a pre-charging resistor, low-voltage accessories such as a DCDC (direct current), a current sensor, a low-voltage battery and a VCU (vertical charging Unit), and high-voltage accessories such as an EAC (earth-insulated switchgear). The main relay comprises a main positive relay and a main negative relay, the battery pack is generally formed by serially connecting a plurality of battery monomers, the positive pole of the battery pack is connected with the positive pole input end of the DCDC through the main positive relay, the negative pole of the battery pack is connected with the negative pole input end of the DCDC through the main negative relay, the pre-charging relay is connected with the pre-charging resistor in series and then connected with the two ends of the main positive relay in parallel, and the output end of the DCDC converter is respectively connected with the two ends of the low-voltage battery and accessories for low voltage to. The output end of the DCDC converter is connected with a current sensor in series for detecting current, the current output end is connected with a VCU, and the VCU is connected with an enabling control end of the DCDC through a CAN line.
An MSD (battery pack switch) is provided inside the battery pack, and the switch is formed by connecting a high-voltage fuse in series with a high-voltage circuit breaker. When the power battery fails, the high-voltage fuse is disconnected when the current exceeds a certain limit value. When in maintenance, the high-voltage circuit breaker can be manually disconnected, the internal circuit of the battery pack is cut off, and the operation is safe. When the battery pack is formed by serially connecting a plurality of battery monomers, the MSD and the battery monomers are serially connected together so as to realize control; when the parallel connection is performed, the MSD is arranged at the output end of the battery pack after the parallel connection.
Design of a pre-charging resistor: the high voltage on the whole vehicle needs the main relay (main positive and main negative) to be completely closed, and in order to protect the main positive relay contact, the invention designs the pre-charging relay to be connected with a pre-charging resistor in series (the resistance value gradually becomes smaller along with the connection time, and the resistance value is changed), so that the protection circuit avoids the sudden change of high voltage and heavy current. Meanwhile, a pre-charging environment is provided for high-voltage accessories such as the EAC and the PTC which need to be pre-charged (only one pre-charging is needed, and the cost is saved). When the pre-charging is completed, the main positive relay is closed.
The VCU controls the DCDC to work through a CAN line signal, and the DCDC converts the high-voltage direct current of 360V into the direct current of 14V under the general condition.
A current sensor: and detecting the magnitude of the output current of the DCDC, and sending the detection result to the VCU for controlling the VCU, detecting data, judging faults and controlling.
A management control method for an automobile auxiliary power supply comprises the following control steps:
1. DCDC enable determination:
when the main relay (main positive and main negative) is closed and the DCDC temperature is lower than the DCDC enabling temperature threshold value 90 ℃ (TBD) and the DCDC has no system fault, the VCU issues a DCDC enabling command if any of the following conditions are met:
1) the PowerMode mode is Charge;
2) the vehicle enters a READY state;
3) the PowerMode signal is in an On state, the vehicle is in a non-READY state, and the voltage of the low-voltage storage battery is lower than a DCDC enabling voltage threshold value 11V (TBD).
2. DCDC disable determination:
satisfying any one of the following conditions, DCDC exit enabled:
1) and detecting that the DCDC low-voltage charging fault is True and lasting for a certain time of 0.5s (TBD), and sending a DCDC enable exit command by the VCU.
2) And detecting that the DCDC short-circuit overcurrent fault is True and lasting for a certain time of 0.5s (TBD), and sending a DCDC enable exit command by the VCU.
3) And if the DCDC self fault is detected to be True and lasts for a certain time of 0.5s (TBD), the VCU sends a DCDC enable exit command.
4) And the PowerMode signal is in an Off state and lasts for a certain time of 0.5s (TBD), the VCU sends out a DCDC enable-out command.
5) And detecting that the DCDC temperature exceeds a DCDC enable prohibiting temperature threshold value of 100 ℃ (TBD) for a certain time of 0.5s (TBD), and then the VCU sends a DCDC enable exiting command.
6) And the main relay (main positive or main negative) is in an off state and lasts for a certain time of 0.5s (TBD), and the VCU sends out a DCDC enable-out command.
3. DCDC low-voltage output voltage value
1) And when the DCDC is not enabled, the DCDC low-voltage output request voltage value is 0V (TBD), and the valid bit of the DCDC low-voltage output voltage value is invalid.
2) And after the DCDC is enabled, the DCDC low-voltage output request voltage value is determined by table lookup according to the DCDC low-voltage output current. If the DCDC temperature exceeds a certain value of 80 ℃ (TBD), the DCDC output power is limited, and the DCDC low-voltage output request voltage value is adjusted to a specific value of 12V (TBD). When the DCDC temperature is reduced to a specific value 60 ℃ (TBD), the DCDC low-voltage output request voltage value is determined by table lookup according to the DCDC low-voltage output current.
3) And if the voltage value of the DCDC low-voltage output request is greater than 0V, the effective bit of the DCDC low-voltage output voltage value is valid.
4. Low voltage battery charge indication
1) When the high voltage is not applied and the DCDC does not work, lightening a low-voltage battery charging indicator lamp; (Red indicator light: currently the low-voltage battery is not charged)
2) And if the DCDC has a low-voltage charging fault, lighting a low-voltage battery charging indicator lamp.
5. DCDC fault determination
(ii) DCDC Low Voltage charging Fault
And 5s (TBD) after the VCU controls the DCDC to enable, if the voltage value of the low-voltage battery is detected to be 10.6-11.5V (TBD), a DCDC low-voltage charging primary fault is reported, and if the voltage value of the low-voltage battery is detected to be less than 10.5V (TBD), a DCDC low-voltage charging secondary fault is reported, and the fault can be eliminated after the VCU is electrified again.
② short-circuit overcurrent fault of DCDC
And 5s (TBD) after the VCU controls the DCDC to enable, if the current value of the low-voltage battery is detected to be 108-112A (TBD), the DCDC short-circuit overcurrent primary fault is reported, if the current value of the low-voltage battery is detected to be larger than 112A (TBD), the DCDC short-circuit overcurrent secondary fault is reported, and the fault can be removed by electrifying again.
In the application, the DCDC converter has a temperature self-checking function and a fault self-checking function and CAN transmit data to the VCU through the CAN line for the VCU to analyze, judge and control.
In the present application, each english notation includes:
PowerMode: power mode.
Charge: a state of charge.
An ON state: the whole vehicle is electrified under low voltage without high voltage.
Ready state: the whole vehicle is in a drivable state after being electrified.
MSD: and a battery pack switch.
DCDC: a dc converter (rated power 1.5KW, rated output 14V, rated output current 107A). The temperature state and the fault state can be self-checked.
VCU: and (5) a vehicle control unit.
EAC: electric compressors (refrigeration) (cannot be powered directly, pre-charge is required).
PTC: heater (heating) (cannot be directly powered on, needs pre-charging).
TBD: the parameter that can mark adapts to different hardware equipment and states.
The application has the advantages that through the scheme, the application is provided with;
1. the invention designs an automobile auxiliary power supply management system, wherein an MSD (battery pack switch) is arranged in a power battery, and the switch is formed by connecting a high-voltage fuse and a high-voltage breaker in series. When the power battery fails, the high-voltage fuse is disconnected when the current exceeds a certain limit value. When the high-voltage circuit breaker is overhauled, the high-voltage circuit breaker can be manually disconnected, the internal circuit of the battery pack is cut off, and the safety is greatly improved.
2. The automobile auxiliary power supply management system designed by the invention is provided with the pre-charging relay and the pre-charging resistor at the port of the high-voltage power battery, so that the main positive relay is better protected, a pre-charging environment is provided for high-voltage components needing pre-charging, safety is realized, and cost is saved.
3. The automobile auxiliary power supply management system designed by the invention is additionally provided with the current sensor at the DCDC output end, and whether the DCDC has the overcurrent fault or not is judged by detecting the DCDC output current, so that the safety is improved.
4. A more perfect control method is designed to control the enabling and the quitting of the DCDC, and the safety and the control efficiency are improved.
5. A DCDC protection mode is designed, namely in different working environments, the voltage output by the DCDC is slightly different, and the service life of the DCDC and the stability of a system are improved.
6. A low-voltage battery charging indication is designed, so that the influence on the service life of the battery and the normal work of low-voltage accessories caused by over-discharge of the low-voltage battery is avoided.
7. The designed DCDC fault diagnosis method comprises the following steps: low voltage charging faults and short circuit overcurrent faults. The safety and the stability of the system are improved.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. An automobile auxiliary power supply management system comprises a battery pack, a DCDC converter, a low-voltage storage battery and a VCU, wherein the battery pack is connected with the low-voltage storage battery through the DCDC converter, the VCU is connected with a control end of the DCDC converter, and the automobile auxiliary power supply management system is characterized in that: the output end of the DCDC converter is connected with a current sensor in series, the output end of the current sensor is connected with a VCU, and the output end of the VCU is connected with a fault alarm module.
2. The vehicle auxiliary power management system of claim 1, wherein: the DCDC converter is connected with the control end of the VCU through a CAN line and used for controlling the DCDC converter to convert the voltage of the battery pack into the charging voltage of the low-voltage storage battery.
3. An automotive auxiliary power management system as defined in claim 1 or 2, characterized in that: the VCU is connected with the low-voltage battery charging indication module.
4. An automobile assistant management system according to claim 1 or 2, characterized in that: the VCU detects temperature data of the DCDC converter through a temperature sensor.
5. An automobile assistant management system according to claim 1 or 2, characterized in that: the battery pack comprises a battery pack, a main positive relay, a main negative relay, a pre-charging relay and a pre-charging resistor, wherein the main positive relay and the main negative relay are respectively arranged on positive and negative output terminals of the battery pack, the pre-charging resistor and the pre-charging relay are connected in series and then connected in parallel at two ends of the main positive relay, and the main positive relay, the main negative relay and the pre-charging relay are respectively connected with a VCU (vertical control Unit).
6. An auxiliary management system for a vehicle according to any one of claims 1 to 5, wherein: the system further comprises a battery pack switch MSD, wherein the battery pack switch MSD is connected in series in the battery pack and used for controlling connection between the battery packs, and the battery pack switch comprises a voltage fuse and a high-voltage circuit breaker which are connected in series.
7. A management control method for an automobile auxiliary power supply is characterized by comprising the following steps: the method comprises a DCDC fault judgment management step, wherein a VCU enables the DCDC to work, detects the voltage and current values of the DCDC during low-voltage charging, and judges the voltage and current values to give a fault alarm.
8. The automobile auxiliary power supply management control method according to claim 7, characterized in that: the method further comprises a DCDC enable control step: the VCU is used for controlling the enabling of the DCDC converter, and when the main positive relay and the main negative relay are closed, the temperature of the DCDC converter is lower than a DCDC enabling temperature threshold value, and the DCDC has no system fault, the VCU sends a DCDC enabling command if any one of the following conditions is met:
1) the PowerMode mode is Charge;
2) the vehicle enters a READY state;
3) and the PowerMode signal is in an On state, the vehicle is in a non-READY state, and the voltage of the low-voltage storage battery is lower than a DCDC enabling voltage threshold value.
9. The vehicle auxiliary power management control method according to claim 8, characterized in that: the DCDC enable control step further includes: the VCU controls the DCDC to quit the enable working state, and when any one of the following conditions is met, the VCU controls the DCDC to quit the enable:
1) detecting that the DCDC low-voltage charging fault is True, and the duration time is greater than a set time threshold;
2) detecting that the DCDC short-circuit overcurrent fault is True, wherein the duration time is greater than a set time threshold;
3) detecting that the DCDC has a True fault and the duration time is greater than a set time threshold;
4) the PowerMode signal is in an Off state, and the duration time is greater than a set time threshold;
5) detecting that the DCDC temperature exceeds a threshold value of the DCDC enable prohibition temperature and the duration is greater than a set time threshold value;
6) the main relay is in an off state and the duration time is greater than a set time threshold.
10. The automobile auxiliary power supply management control method according to claim 7, characterized in that: the method further comprises a DCDC low-voltage output control step:
1) when the DCDC is not enabled, the DCDC low-voltage output request voltage value is 0V, and the valid bit of the DCDC low-voltage output voltage value is invalid;
2) after the DCDC is enabled, the DCDC low-voltage output request voltage value is determined by table look-up according to the DCDC low-voltage output current; if the DCDC temperature exceeds the power limit temperature threshold, limiting the DCDC output power, and adjusting the DCDC low-voltage output request voltage value to be a limit voltage value; when the DCDC temperature is reduced to the threshold value of the limitation-free temperature, the DCDC low-voltage output request voltage value is subjected to table lookup determination according to the DCDC low-voltage output current;
3) and if the voltage value of the DCDC low-voltage output request is greater than 0V, the effective bit of the DCDC low-voltage output voltage value is valid.
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