CN115583152A - Method and system for detecting connection state of output line of DCDC module - Google Patents

Method and system for detecting connection state of output line of DCDC module Download PDF

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Publication number
CN115583152A
CN115583152A CN202110755300.0A CN202110755300A CN115583152A CN 115583152 A CN115583152 A CN 115583152A CN 202110755300 A CN202110755300 A CN 202110755300A CN 115583152 A CN115583152 A CN 115583152A
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voltage
dcdc module
value
current
vehicle
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CN202110755300.0A
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Chinese (zh)
Inventor
邱琳
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GAC Aion New Energy Automobile Co Ltd
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GAC Aion New Energy Automobile Co Ltd
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Priority to CN202110755300.0A priority Critical patent/CN115583152A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K31/00—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator
    • B60K31/0008—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator including means for detecting potential obstacles in vehicle path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Arrangement of adaptations of instruments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The invention discloses a method and a system for detecting the connection state of an output circuit of a DCDC module, which can conveniently diagnose the abnormal connection condition of a 12v output circuit of the DCDC module by combining a voltage method and a current method, and timely light an instrument fault lamp to inform a customer of checking and maintaining a vehicle in advance so as to ensure the safety of the vehicle. The invention has the advantages of high detection accuracy, easy realization and low cost without changing the existing high-low voltage power supply structure in the pure electric motor.

Description

Method and system for detecting connection state of output line of DCDC module
Technical Field
The invention relates to the technical field of direct current converter diagnosis, in particular to a method and a system for detecting the connection state of an output line of a DCDC module.
Background
The high-voltage power of the high-voltage battery can be converted into a 12v power supply through a DCDC module (direct current converter) on the pure electric vehicle, and the 12v power supply is supplied to a low-voltage system, so that normal use of low-voltage electric appliance equipment, an ECU controller and the like of the vehicle is guaranteed.
When the DCDC module is mounted on a vehicle, the connection of the negative wire harness terminal is abnormal or the main fuse of the output circuit is blown out due to production, after-sale replacement installation omission or vibration and bump of the vehicle in use. When the situation happens, 12v output by the DCDC module cannot be supplied to vehicle low-voltage electrical equipment and an ECU controller for use, and only the electric quantity of a low-voltage storage battery can be consumed; when the consumption time is increased, the low-voltage storage battery is fed, so that the supply voltage of the low-voltage storage battery is smaller than the operable voltage range. When such a situation occurs, the vehicle in running is powered off due to the fact that the ECU controller cannot work, power is lost, and great risks are caused to running safety.
In the prior art, if a fault (e.g., input under-voltage, overcurrent, etc.) occurs inside the DCDC module, the DCDC module itself can diagnose the corresponding fault and can directly light a fault lamp on the combination meter to remind the driver. However, if there is no fault inside the DCDC module, and a negative harness terminal connection abnormality occurs, the DCDC module cannot detect itself. In order to detect such a situation, in the prior art, a control circuit is generally required to be additionally arranged inside the DCDC module, and the control circuit determines the connection state between the converter of the DCDC module and the 12V storage battery according to the collected voltage data by detecting that a voltage signal corresponding to a resistor is input to an input end of the control circuit. Such control circuits typically require the use of a control chip or processing chip having data processing capabilities. Therefore, the existing detection method can increase the cost and development difficulty of the DCDC module, and can not be realized for some DCDC modules without internal detection electronic components.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for detecting the connection state of the output line of the DCDC module, which can conveniently detect and diagnose that the connection state of the 12v circuit detected by the DCDC module is abnormal, and perform alarm reminding.
In order to solve the above technical problems, as an aspect of the present invention, a method for detecting a connection state of an output line of a DCDC module, which can be applied to a pure electric vehicle, is provided, and the method includes the following steps:
step S10, when the trigger condition is met, starting a function of detecting the connection state of the output line of the DCDC module;
step S11, periodically obtaining the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle;
step S12, obtaining a difference value between the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle, comparing the difference value with a preset voltage threshold value, and judging whether the difference value is greater than or equal to the voltage threshold value;
step S13, when the judgment result is yes, obtaining a 12V output current value of the current DCDC module;
step S14, judging whether the battery current value is smaller than a preset current threshold value and continues for at least one preset time threshold value;
and S15, when the judgment result is yes, determining that the connection of the 12V output line of the DCDC module is abnormal, performing abnormal alarm, and limiting the vehicle speed not to exceed a preset first vehicle speed threshold value.
In step S10, the triggering condition is:
the vehicle completes the low voltage application and the high voltage application while the vehicle speed is greater than a predetermined second vehicle speed threshold.
The voltage threshold value is 0.8V, the current threshold value is 7A, the time threshold value is 30s, the first vehicle speed threshold value is 60km/h, and the second vehicle speed threshold value is 3km/h.
In step S15, the performing of the abnormal alarm specifically includes:
after the abnormal connection of the 12V output line of the DCDC module is determined, a warning lamp of the combination instrument is lightened or a warning is given through sound, and meanwhile, a speed limit request is sent to the VCU so as to control the speed of the vehicle to be not more than the preset first vehicle speed threshold value.
Wherein, further include:
in step S12 or step S14, when the determination result is no, it is determined that the output line connection of the DCDC module 12V is normal, and the flow proceeds to step S11.
Accordingly, in another aspect of the present invention, a system for detecting a connection state of an output line of a DCDC module, which can be applied to a pure electric vehicle, includes:
the function starting unit is used for starting a function of detecting the connection state of the output line of the DCDC module when judging that a preset trigger condition is met;
the voltage value obtaining unit is used for periodically obtaining the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle;
the first condition judgment unit is used for receiving the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery, which are obtained by the voltage value obtaining unit, calculating a difference value between the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery, comparing the difference value with a preset voltage threshold value, and judging whether the difference value is greater than or equal to the voltage threshold value;
the current value obtaining unit is used for obtaining the 12V output current value of the current DCDC module when the judgment result of the first condition judgment unit is yes;
the second condition judgment unit is used for judging whether the battery current value is smaller than a preset current threshold value and continues for at least one preset time threshold value;
and the abnormality processing unit is used for determining that the connection of the 12V output line of the DCDC module is abnormal, giving an abnormality alarm and limiting the vehicle speed not to exceed a preset first vehicle speed threshold when the judgment result of the second condition judgment unit is yes.
Wherein the triggering condition is as follows:
the vehicle completes the low voltage supply and the high voltage supply, and the vehicle speed is larger than a preset second vehicle speed threshold.
The voltage threshold value is 0.8V, the current threshold value is 7A, the time threshold value is 30s, the first vehicle speed threshold value is 60km/h, and the second vehicle speed threshold value is 3km/h.
Wherein the exception handling unit is specifically configured to:
after the abnormal connection of the 12V output line of the DCDC module is determined, an alarm lamp of the combination instrument is lightened or an alarm is given through sound, and meanwhile, a speed limit request is sent to the VCU so as to control the speed of the vehicle to be not more than a preset first vehicle speed threshold value.
Wherein, further include:
and the connection normal processing unit is used for determining that the connection of the 12V output line of the DCDC module is normal and controlling the voltage value obtaining unit to continue working when the judgment result of the first condition judgment unit or the second condition judgment unit is negative.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method and a system for detecting the connection state of an output line of a DCDC module, wherein the abnormal state of the connection of the output line of the DCDC module can be conveniently detected by comparing the 12v output voltage of the DCDC module with the positive voltage of a low-voltage storage battery and combining the output current of the DCDC module;
according to the embodiment of the invention, the monitoring circuit is formed without additionally adding detection electronic components, and the abnormal state of the connection state of the 12v output circuit of the DCDC module can be diagnosed by utilizing the existing detection circuit and combining a voltage method and a current method for comparison; the method is low in cost, and the detection efficiency and accuracy are very high; after the abnormality is diagnosed, the driver can be reminded to check and maintain the vehicle in time by means of lightening the instrument fault lamp and limiting the highest vehicle speed, and the driving safety is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive labor.
FIG. 1 is a schematic diagram of an application environment of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a method for detecting a connection status of an output line of a DCDC module according to the present invention;
FIG. 3 is a more detailed schematic flow diagram corresponding to FIG. 2;
fig. 4 is a schematic structural diagram of an embodiment of a system for detecting a connection state of an output line of a DCDC module according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a schematic diagram of an application environment of the present invention is shown; in a pure electric vehicle, a power supply system generally includes a power battery and a battery management system, a vehicle control unit, an integrated motor controller, a DCDC module, a low-voltage battery, and a low-voltage load. Wherein:
the power battery and the battery management system are used for providing electric energy for the pure electric vehicle and driving the vehicle. The power battery provides high-voltage electricity input for the DCDC module, and the DCDC module is used for converting the high-voltage electricity into 12v low-voltage electricity output;
the vehicle control unit is used for controlling the vehicle to finish high voltage application, controlling the DCDC module to be opened and closed, and monitoring the fault state of the DCDC module;
the integrated motor controller is used for carrying out pre-charging protection when the voltage of the DCDC module is high and carrying out electric energy discharge protection when the voltage of the DCDC module is low;
the DCDC module is a direct current converter and is used for receiving the instruction of the whole vehicle controller, converting the high voltage of the power battery into low voltage of 12v and outputting the low voltage to a low voltage system for working;
a low voltage battery, which may be, for example, a low voltage lead acid battery, for powering the entire vehicle 12v low voltage system before the DCDC module is not operational; or the supplementary power supply is carried out after the DCDC module supplies power;
the low-voltage load comprises all 12v low-voltage power consumption systems on the vehicle, such as a controller ECU, a lighting system, a loudspeaker, an air conditioner blower, a switch, a motor and the like.
It can be understood that the pure electric vehicle low-voltage power supply system is composed of a low-voltage storage battery and a DCDC module, and when the vehicle does not have high voltage and the DCDC module does not output power, the vehicle low-voltage system is powered by the low-voltage storage battery. When the vehicle finishes high voltage application, the DCDC module switches on the output power.
In order to ensure that the low-voltage storage battery is always at a higher electric quantity level, no power feed is carried out. The output power of the DCDC module needs to be larger than the sum of the consumed power of the low-voltage load of the vehicle. Meanwhile, the output voltage of the DCDC module is required to be higher than that of the low-voltage storage battery so as to ensure that the storage battery is in a continuous low-current charging state, and the low-voltage storage battery can supply power to the outside for a short time only when the vehicle needs high power instantaneously and the capacity of the storage battery exceeds the maximum power output by the DCDC module.
If the DCDC module has internal faults, such as undervoltage input and overcurrent detection, the DCDC module can diagnose the corresponding faults and can directly light a fault lamp on the combination instrument to remind a driver. However, if there is no fault inside the DCDC module, the negative wire harness terminal is abnormally connected, and the main fuse of the output circuit is blown. The power output by the DCDC module cannot be effectively transmitted to the low-voltage load, so that the low-voltage storage battery can be continuously discharged outwards, and the phenomenon of feeding is further caused.
The present invention provides a very efficient detection method for such a DCDC module internal failure, but a failure due to the output circuit connection status, which will be described below with reference to the accompanying drawings.
Fig. 2 is a main flow chart illustrating an embodiment of a method for detecting a connection state of an output line of a DCDC module according to the present invention. In this implementation, the method comprises the steps of:
step S10, when the trigger condition is met, starting a function of detecting the connection state of the output line of the DCDC module;
in step S10, the triggering condition is:
the vehicle completes the low voltage and high voltage power while the vehicle speed is greater than a predetermined second vehicle speed threshold, which in one example is 3km/h.
S11, periodically obtaining the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle;
step S12, obtaining a difference value between the current output voltage value of the DCDC module and the current positive voltage value (namely KL30 voltage) of the low-voltage storage battery in the electric vehicle, comparing the difference value with a preset voltage threshold value, and judging whether the difference value is greater than or equal to the voltage threshold value, wherein in one example, the voltage threshold value is 0.8V;
step S13, when the judgment result is yes, obtaining the 12V output current value of the current DCDC module;
step S14, determining whether the battery current value is less than a predetermined current threshold (e.g. 7A) for at least a predetermined time (e.g. 30S);
and step S15, when the judgment result is yes, determining that the connection of the 12V output line of the DCDC module is abnormal, performing abnormal alarm, and limiting the vehicle speed not to exceed a preset first vehicle speed threshold (such as 60 km/h).
In step S15, the performing of the abnormal alarm specifically includes:
after the abnormal connection of the 12V output line of the DCDC module is determined, a warning lamp of the combination instrument is lightened or a warning is given through sound, and meanwhile, a speed limit request is sent to the VCU so as to control the speed of the vehicle to be not more than the preset first vehicle speed threshold value. Under the condition, a fault lamp on the combination instrument is lightened through the DCDC module, a customer can be informed to check and maintain the vehicle in time in advance, the VCU reports a fault according to the DCDC module, the maximum vehicle speed of the vehicle is actively limited to be not more than 60km/h, and the customer attention is attracted, so that the vehicle safety is ensured.
Wherein, further include:
in step S12 or step S14, when the determination result is no, it is determined that the output line connection of the DCDC module 12V is normal, and the flow proceeds to step S11.
In the method of the present invention, wherein the selection of the current threshold and the voltage threshold is based on the following principle:
in terms of voltage, the actual output voltage of the DCDC module is generally about 14 v. The maximum voltage of the storage battery is generally about 12.8 v. When the DCDC module is not operating, the KL30 voltage of the DCDC module approaches the low-voltage battery voltage. When the DCDC module works normally and the output circuit is connected normally, the voltage value of the positive electrode of the low-voltage storage battery (namely the KL30 voltage value) is close to the output voltage of the DCDC module, and under the condition, the voltage value obtained by subtracting the KL30 voltage value from the 12v output value detected by the DCDC module is basically within 0.5v (harness loss). For example, in one example, when the output circuit connection of the DCDC module is abnormal, the DCDC module detects that the 12v output voltage is 14v, the KL30 voltage of the DCDC module is 12.8v, and the DCDC module detects that the KL30 voltage value subtracted from the 12v output is 1.2v. Therefore, through voltage method comparison, a certain voltage acquisition error margin is reserved, and when the fact that the value obtained by subtracting the KL30 voltage value from the 12v output value detected by the DCDC module is larger than or equal to 0.8v is judged, the connection state of the output circuit of the DCDC module can be judged to be abnormal.
On the other hand, in terms of current, a low-voltage load of the vehicle consumes a certain amount of power as long as the vehicle finishes high-voltage power supply, even if the vehicle is in a very low-load working condition, because for example, a high-voltage relay consumes power, all ECU controllers of the vehicle consume power, and an instrument and a central control panel consume power. The sum of the power consumptions of the devices reaches at least 10A. Therefore, when the DCDC module works normally and the output circuit is connected normally, the low-voltage load supplies power and the DCDC module outputs power, and the 12v output current detected by the DCDC module is generally more than or equal to 10A; however, if the output circuit of the DCDC module is abnormally connected, which is equivalent to that no load is connected behind the output of the DCDC module 12v, the detection of 12v output current by the DCDC module is generally less than or equal to 1A (no output). Therefore, through comparison by a current method, a certain current acquisition error margin is reserved, and when the DCDC module is judged to detect that the 12v output current is less than or equal to 7A and lasts for 30s, the abnormal connection state of the output circuit of the DCDC module can be judged.
The method provided by the invention combines the voltage judgment method and the current judgment method, and when the two methods judge that the fault occurs, the DCDC module can judge that the 12v circuit connection state is abnormal.
As shown in fig. 2, a more detailed flow chart of the present invention corresponding to fig. 2 is shown. The process comprises the following steps:
judging whether the vehicle finishes the low voltage application;
if the condition that the vehicle finishes the high voltage and the low voltage is met, continuously judging whether the vehicle finishes the high voltage or not, and if the vehicle does not finish the low voltage, not starting the function of detecting the connection state of the 12v output terminal by the DCDC module;
step three, if the vehicle is satisfied with the condition of finishing high voltage, the VCU enables the DCDC module to work and outputs 12v;
step four, judging whether the vehicle speed is more than or equal to 3km/h;
step five, if the vehicle meets the condition that the vehicle speed is more than or equal to 3km/h, the DCDC module starts a function of detecting the connection state of the 12v output terminal;
step six, judging whether the difference value of the 12v output voltage of the DCDC module and the KL30 input voltage of the constant power of the storage battery connected with the DCDC module is larger than or equal to 0.8v;
step seven, if the DCDC module meets the condition that the 12v output-KL 30 voltage is larger than or equal to 0.8v, continuously judging whether the 12v output current detected by the DCDC module is smaller than or equal to 7A and lasts for 30s;
step eight, if the conditions that the DCDC module detects that the 12v output-KL 30 voltage is more than or equal to 0.8v and the DCDC module detects whether the 12v output current is less than or equal to 7A and lasts for 30s are met, the DCDC module judges that the 12v output terminal is connected abnormally;
step nine, the DCDC module lights an alarm lamp of the combination instrument;
step ten, the VCU limits the vehicle speed to be less than or equal to 60km/h;
step eleven, if the conditions that the DCDC module detects that the 12v output-KL 30 voltage is larger than or equal to 0.8v and the DCDC module detects whether the 12v output current is smaller than or equal to 7A and lasts for 30s are not met, the DCDC module judges that the 12v output terminal is normally connected.
Step twelve: when the vehicle is used in a whole vehicle, the flow is transferred to the fifth step, and the DCDC module keeps the function of starting and detecting the connection state of the 12V output terminal;
fig. 4 is a schematic structural diagram illustrating an embodiment of a system for detecting a connection state of an output line of a DCDC module according to the present invention. In an implementation application, the system is implemented in a battery management system of a pure electric vehicle, and specifically, in this embodiment, the system 1 includes:
a function starting unit 10, configured to start a function of detecting a connection state of an output line of the DCDC module when it is determined that a predetermined trigger condition is satisfied;
the voltage value obtaining unit 11 is used for periodically obtaining the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle;
a first condition determining unit 12, configured to receive the current output voltage value of the DCDC module obtained by the voltage value obtaining unit 11 and the current positive voltage value of the low-voltage battery, calculate a difference between the current output voltage value and the current positive voltage value, compare the difference with a predetermined voltage threshold, and determine whether the difference is greater than or equal to the voltage threshold;
a current value obtaining unit 13, configured to obtain a 12V output current value of the current DCDC module when the determination result of the first condition determining unit 12 is yes;
a second condition determining unit 14, configured to determine whether the battery current value is smaller than a predetermined current threshold and lasts for at least a predetermined time threshold;
the abnormality processing unit 15 is configured to determine that the connection of the output line of the DCDC module 12V is abnormal, perform an abnormality alarm, and limit the vehicle speed to not exceed a predetermined first vehicle speed threshold when the judgment result of the second condition judgment unit 14 is yes; more specifically, after determining that the connection of the 12V output line of the DCDC module is abnormal, a combination meter alarm lamp is lightened or an alarm is given through sound, and meanwhile, a speed limit request is sent to the VCU so as to control the speed of the vehicle to be not more than a preset first vehicle speed threshold value.
And a connection normal processing unit 16, configured to determine that the output line of the DCDC module 12V is connected normally and control the voltage value obtaining unit to continue to operate when the judgment result of the first condition judging unit 12 or the second condition judging unit 14 is negative.
Specifically, in one example, the trigger condition is:
the vehicle completes the low voltage supply and the high voltage supply, and the vehicle speed is larger than a preset second vehicle speed threshold.
The voltage threshold value is 0.8V, the current threshold value is 7A, the time threshold value is 30s, the first vehicle speed threshold value is 60km/h, and the second vehicle speed threshold value is 3km/h.
For more details, reference may be made to and combined with the above description of fig. 1 to 3, which is not described in detail here.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method and a system for detecting the connection state of an output line of a DCDC module, wherein the abnormal state of the connection of the output line of the DCDC module can be conveniently detected by comparing the 12v output voltage of the DCDC module with the positive voltage of a low-voltage storage battery and combining the output current of the DCDC module;
according to the embodiment of the invention, the monitoring circuit is formed without additionally adding detection electronic components, and the abnormal state of the connection state of the 12v output circuit of the DCDC module can be diagnosed by utilizing the existing detection circuit and combining a voltage method and a current method for comparison; the method is low in cost, and the detection efficiency and accuracy are very high; after the abnormality is diagnosed, the driver can be reminded to check and maintain the vehicle in time by means of lightening the instrument fault lamp and limiting the highest vehicle speed, and the driving safety is improved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. A method of detecting a DCDC module output line connection status, the method comprising the steps of:
step S10, when a preset trigger condition is met, starting a function of detecting the connection state of an output line of the DCDC module;
s11, periodically obtaining the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle;
step S12, obtaining a difference value between the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle, comparing the difference value with a preset voltage threshold value, and judging whether the difference value is greater than or equal to the voltage threshold value;
step S13, when the judgment result is yes, obtaining the 12V output current value of the current DCDC module;
step S14, judging whether the battery current value is smaller than a preset current threshold value and continues for at least one preset time threshold value;
and S15, when the judgment result is yes, determining that the connection of the 12V output line of the DCDC module is abnormal, performing abnormal alarm, and limiting the vehicle speed not to exceed a preset first vehicle speed threshold value.
2. The method of claim 1, wherein in step S10, the triggering condition is:
the vehicle completes the low voltage supply and the high voltage supply, and the vehicle speed is larger than a preset second vehicle speed threshold.
3. The method of claim 2, wherein the voltage threshold is 0.8V, the current threshold is 7A, the time threshold is 30s, the first vehicle speed threshold is 60km/h, and the second vehicle speed threshold is 3km/h.
4. The method according to claim 3, wherein in step S15, the performing an anomaly alarm is specifically:
after the abnormal connection of the 12V output line of the DCDC module is determined, a warning lamp of the combination instrument is lightened or a warning is given through sound, and meanwhile, a speed limit request is sent to the VCU so as to control the speed of the vehicle to be not more than the preset first vehicle speed threshold value.
5. The method of any of claims 1 to 4, further comprising:
in step S12 or step S14, when the determination result is no, it is determined that the output line connection of the DCDC module 12V is normal, and the flow proceeds to step S11.
6. A system for detecting a connection status of an output line of a DCDC module, comprising:
the function starting unit is used for starting a function of detecting the connection state of the output line of the DCDC module when judging that a preset trigger condition is met;
the voltage value obtaining unit is used for periodically obtaining the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery in the electric vehicle;
the first condition judgment unit is used for receiving the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery, which are obtained by the voltage value obtaining unit, calculating a difference value between the current output voltage value of the DCDC module and the current positive voltage value of the low-voltage storage battery, comparing the difference value with a preset voltage threshold value, and judging whether the difference value is greater than or equal to the voltage threshold value;
the current value obtaining unit is used for obtaining the 12V output current value of the current DCDC module when the judgment result of the first condition judgment unit is yes;
the second condition judging unit is used for judging whether the battery current value is smaller than a preset current threshold value and continues for at least one preset time threshold value;
and the abnormality processing unit is used for determining that the connection of the 12V output line of the DCDC module is abnormal, giving an abnormality alarm and limiting the vehicle speed not to exceed a preset first vehicle speed threshold when the judgment result of the second condition judgment unit is yes.
7. The system of claim 6, wherein the trigger condition is:
the vehicle completes the low voltage supply and the high voltage supply, and the vehicle speed is larger than a preset second vehicle speed threshold.
8. The system of claim 7, wherein the voltage threshold is 0.8V, the current threshold is 7A, the time threshold is 30s, the first vehicle speed threshold is 60km/h, and the second vehicle speed threshold is 3km/h.
9. The system of claim 8, wherein the exception handling unit is specifically configured to:
after the abnormal connection of the 12V output line of the DCDC module is determined, a warning lamp of the combination instrument is lightened or a warning is given through sound, and meanwhile, a speed limit request is sent to the VCU so as to control the speed of the vehicle to be not more than the preset first vehicle speed threshold value.
10. The system of any of claims 6 to 9, further comprising:
and the connection normal processing unit is used for determining that the connection of the 12V output line of the DCDC module is normal and controlling the voltage value obtaining unit to continue working when the judgment result of the first condition judgment unit or the second condition judgment unit is negative.
CN202110755300.0A 2021-07-05 2021-07-05 Method and system for detecting connection state of output line of DCDC module Pending CN115583152A (en)

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CN202110755300.0A CN115583152A (en) 2021-07-05 2021-07-05 Method and system for detecting connection state of output line of DCDC module

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Application Number Priority Date Filing Date Title
CN202110755300.0A CN115583152A (en) 2021-07-05 2021-07-05 Method and system for detecting connection state of output line of DCDC module

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CN115583152A true CN115583152A (en) 2023-01-10

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