CN117368788A - Vehicle low-voltage power supply fault diagnosis method, device and computer readable storage medium - Google Patents
Vehicle low-voltage power supply fault diagnosis method, device and computer readable storage medium Download PDFInfo
- Publication number
- CN117368788A CN117368788A CN202311345701.4A CN202311345701A CN117368788A CN 117368788 A CN117368788 A CN 117368788A CN 202311345701 A CN202311345701 A CN 202311345701A CN 117368788 A CN117368788 A CN 117368788A
- Authority
- CN
- China
- Prior art keywords
- voltage
- low
- power supply
- current
- short
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003745 diagnosis Methods 0.000 title claims abstract description 166
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims description 75
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims 10
- 238000013461 design Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to the technical field of vehicle fault diagnosis, and discloses a vehicle low-voltage power supply fault diagnosis method, a device and a computer-readable storage medium, wherein the method comprises the following steps: acquiring current diagnosis information respectively acquired by each fault diagnosis unit of a vehicle low-voltage power supply system; and performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information. By applying the technical scheme of the invention, the coverage and the accuracy of the fault diagnosis of the whole vehicle low-voltage power supply can be improved, so that the overall requirement of the automatic driving grade on the power supply can be met, and the overall safety performance of the vehicle can be improved.
Description
Technical Field
The invention relates to the technical field of vehicle fault diagnosis, in particular to a vehicle low-voltage power supply fault diagnosis method, a vehicle low-voltage power supply fault diagnosis device and a computer readable storage medium.
Background
With the development of the intellectualization of the automobile, the automobile with the automatic driving function gradually becomes the main direction of the automobile development, and when the automobile is in the L3 automatic driving classification, the automobile is required to complete the tasks of steering, acceleration and deceleration, road condition detection and reaction under the specified running condition; in some situations the driver may fully deliver driving rights to the autonomous vehicle, but need to take over when necessary.
In order to meet the requirement of the L3 automatic driving level, the vehicle needs to have complete autonomous driving capability, and when a fault occurs, the vehicle can still be ensured to run safely for a period of time until a driver takes over, so that the vehicle needs to carry out power related safety design to meet the L3 automatic driving level, and the vehicle can be ensured to run normally with basic safety functions when the power source type fault occurs.
The main current power supply safety design scheme only adopts an A/B path to independently supply power and performs overall overvoltage and overcurrent diagnosis on the A/B path, and only can perform overall partition control on the A/B path through an isolation valve, so that under a partial failure mode (such as bus short circuit), one abnormal power supply in the AB path can be ensured to be turned off, and the other abnormal power supply is ensured to normally supply power. However, the scheme has larger limitation, the fault of the power supply bus can be effectively diagnosed, other single faults or wire harness faults cannot be effectively diagnosed, the diagnosis coverage rate is insufficient, if the power failure of the vehicle-mounted electrical appliances occurs, the power supply of the whole vehicle A/B path is abnormal, finally, the electric control function of the whole vehicle is lost (including automatic driving control), and if personnel fail to control the vehicle through basic mechanical braking and steering in time, serious traffic accidents can be caused.
Accordingly, there is a need to provide a solution to the above-mentioned problems.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a vehicle low-voltage power supply fault diagnosis method, apparatus, and computer readable storage medium, which are used to solve the problems of insufficient coverage of the whole vehicle low-voltage power supply fault diagnosis and insufficient safety of a fault handling strategy in the prior art.
According to an aspect of an embodiment of the present invention, there is provided a vehicle low-voltage power supply failure diagnosis method including:
acquiring current diagnosis information respectively acquired by each fault diagnosis unit of a vehicle low-voltage power supply system;
and performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information.
In an alternative manner, the low voltage power supply system further includes: the system comprises a low-voltage power supply, a plurality of low-voltage power supply buses and a plurality of vehicle-mounted electric appliances distributed according to an array; any fault diagnosis unit is: a voltage detection unit, a short circuit detection unit or an on-off control unit;
the low-voltage power supply supplies power to each low-voltage power supply bus, and each vehicle-mounted electrical appliance is connected with two low-voltage power supply buses respectively;
the low-voltage power supply is provided with a voltage detection unit, at least one short circuit detection unit and at least one on-off control unit, each low-voltage power supply bus is provided with a short circuit detection unit and an on-off control unit, and each power supply connection part of each vehicle-mounted electrical appliance is provided with a voltage detection unit.
In an alternative manner, the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information includes:
when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit corresponding to each low-voltage power supply bus, if one piece of current short-circuit state information corresponding to any vehicle-mounted electric appliance is in a short-circuit state, judging that the low-voltage power supply bus corresponding to the current short-circuit state information is in a short-circuit state, and controlling the on-off control unit on the low-voltage power supply bus to be disconnected; or if the two pieces of current short-circuit state information corresponding to any vehicle-mounted electric appliance are short-circuit states, judging that the vehicle-mounted electric appliance is short-circuited, and controlling the on-off control units on the two paths of low-voltage power supply buses corresponding to the vehicle-mounted electric appliance to be disconnected.
In an optional manner, the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnostic information further includes:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit corresponding to each vehicle-mounted electric appliance, respectively generating a voltage diagnosis code of each low-voltage power supply bus based on a preset code diagnosis rule and all pieces of current voltage state information;
and respectively determining whether each low-voltage power supply bus and the corresponding vehicle-mounted electrical appliance have open-circuit faults or not according to the fault state corresponding to the voltage diagnosis code of each low-voltage power supply bus.
In an alternative way, the low voltage power supply includes: a low voltage battery and a DCDC dc converter; the low-voltage storage battery and the DCDC converter are respectively provided with a short circuit detection unit and an on-off control unit, and are connected with a total voltage detection unit; the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information further includes:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit and the current on-off information acquired by the on-off control unit corresponding to the DCDC converter, if the current voltage state information is a low-voltage fault and the current on-off information corresponding to the DCDC converter is an unabsorbed state, judging that the low-voltage storage battery has a power supply voltage low fault;
or when the at least one piece of current diagnosis information is the current short-circuit state information collected by the short-circuit detection unit on the low-voltage storage battery, if the current short-circuit state information corresponding to the low-voltage storage battery is in a short-circuit state, judging that the low-voltage storage battery has a short-circuit fault, and controlling the on-off control unit on the low-voltage storage battery to be disconnected.
In an optional manner, the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnostic information further includes:
when the at least one piece of current diagnosis information is the current voltage state information collected by the voltage detection unit and the current on-off information collected by the on-off control unit corresponding to the low-voltage storage battery, if the current voltage state information is in a low-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unabsorbed state, judging that the DCDC converter has a fault of excessively low power supply voltage; or if the current voltage state information is in a high voltage state and the current on-off information corresponding to the low voltage storage battery is in an unadsorbed state, judging that the DCDC converter has a fault of overhigh power supply voltage;
or when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit of the DCDC converter, if the current short-circuit state information corresponding to the DCDC converter is in a short-circuit state, judging that the DCDC converter has a short-circuit fault, and controlling the on-off control unit on the DCDC converter to be disconnected.
In an alternative way, any current short circuit state information is: a short-circuit state or no short-circuit state occurs;
wherein, the current value of the short circuit state is more than or equal to 200A, and the current value of the non-short circuit state is less than 200A.
In an alternative way, any current voltage state information is: normal voltage state, low voltage state, high voltage state or unpowered state;
the voltage value range of the normal voltage state is 9-16V, the voltage value range of the low voltage state is 0-9V, the voltage value range of the high voltage state is more than 16V, and the voltage value is not detected in the unpowered state.
According to another aspect of an embodiment of the present invention, there is provided a vehicle low-voltage power supply failure diagnosis apparatus including:
the acquisition module is used for acquiring current diagnosis information acquired by each fault diagnosis unit in the vehicle low-voltage power supply system respectively;
and the diagnosis module is used for diagnosing faults of the low-voltage power supply system based on at least one piece of current diagnosis information.
According to still another aspect of an embodiment of the present invention, there is provided a computer-readable storage medium having stored therein at least one executable instruction for causing a vehicle low-voltage power failure diagnosis apparatus to perform operations of the vehicle low-voltage power failure diagnosis method of the present invention.
According to the embodiment of the invention, the current diagnosis information respectively collected by each fault diagnosis unit of the vehicle low-voltage power supply system is obtained; based on at least one piece of current diagnosis information, fault diagnosis is carried out on the low-voltage power supply system, the coverage and the accuracy of fault diagnosis of the whole low-voltage power supply system can be improved, the overall requirement of an automatic driving level on a power supply is met, and the overall safety performance of the vehicle is improved.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present invention can be more clearly understood, and the following specific embodiments of the present invention are given for clarity and understanding.
Drawings
The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic flow chart of a first embodiment of a vehicle low-voltage power supply fault diagnosis method provided by the invention;
fig. 2 is a schematic diagram showing the structure of a power supply system for a low-voltage power supply in a first embodiment of a vehicle low-voltage power failure diagnosis method provided by the present invention;
FIG. 3 is a schematic flow chart of a second embodiment of a method for diagnosing a vehicle low-voltage power failure according to the present invention;
FIG. 4 is a schematic flow chart of a third embodiment of a method for diagnosing a vehicle low-voltage power failure according to the present invention;
FIG. 5 is a schematic flow chart diagram of a fourth embodiment of a vehicle low-voltage power supply fault diagnosis method provided by the invention;
fig. 6 shows a schematic structural diagram of a first embodiment of a vehicle low-voltage power failure diagnosis apparatus provided by the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
Fig. 1 shows a flowchart of a first embodiment of a vehicle low-voltage power failure diagnosis method provided by the invention, which is executed by a vehicle controller. As shown in fig. 1, the method comprises the steps of:
step 110: and acquiring current diagnosis information acquired by each fault diagnosis unit of the vehicle low-voltage power supply system. Wherein:
(1) the array type automobile low-voltage redundant power supply mode is adopted by the low-voltage power supply system, so that each vehicle-mounted low-voltage electrical appliance can receive two paths of independently controlled power supply inputs, and a single vehicle-mounted electrical appliance can be accurately isolated.
(2) The array type automobile low-voltage redundant power supply mode supports at least 2 low-voltage vehicle-mounted electric appliances. For example, if the array power supply and diagnosis are required for 100 low-voltage load electric appliances, 10 rows by 10 columns of array power supply arrangement or 5 rows by 20 columns of array power supply arrangement can be adopted, and the array power supply arrangement can also be adaptively adjusted according to the requirements of vehicle type projects. As shown in fig. 2, the present embodiment is illustrated with an array of 4 rows by 4 columns.
(3) The low-voltage power supply system includes: the system comprises a low-voltage power supply, a plurality of low-voltage power supply buses, a plurality of fault diagnosis units and a plurality of vehicle-mounted electric appliances distributed according to an array.
(4) The fault diagnosis unit includes, but is not limited to: voltage detection unit, short circuit detection unit and on-off control unit.
(5) The low-voltage power supply source respectively supplies power to each low-voltage power supply bus, and each vehicle-mounted electric appliance is respectively connected with two low-voltage power supply buses. The low-voltage power supply is provided with a voltage detection unit, at least one short circuit detection unit and at least one on-off control unit, each low-voltage power supply bus is provided with a short circuit detection unit and an on-off control unit, and each power supply connection position on each vehicle-mounted electrical appliance is provided with a voltage detection unit.
(6) The current diagnostic information is: the fault diagnosis unit collects current state information. For example, when a certain fault diagnosis unit is a voltage detection unit, the current diagnosis information at this time is: the voltage detection unit collects current voltage state information at a target position. Wherein the current voltage status information includes, but is not limited to: high voltage, normal pressure, low voltage, no power on and other status information.
Specifically, the vehicle controller acquires current diagnostic information acquired by any fault diagnosis unit of the low-voltage power supply system of the vehicle until current diagnostic information acquired by each fault diagnosis unit of the low-voltage power supply system is obtained.
The vehicle controller is a low-voltage power supply controller, belongs to a part of a low-voltage power supply system, and CAN also be arranged outside the low-voltage power supply system and receives current diagnosis information through a vehicle CAN bus.
Step 120: and performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information. Wherein:
(1) the amount of current diagnostic information employed varies for different fault diagnosis types.
(2) Fault diagnosis types include, but are not limited to: short circuit of vehicle-mounted electrical equipment, open circuit of vehicle-mounted electrical equipment, short circuit of low-voltage power supply bus, open circuit of low-voltage power supply bus, too low of low-voltage battery power supply voltage, too high or too low of power supply voltage of DCDC converter, short circuit of DCDC converter and the like.
(3) The partial fault type can carry out fault diagnosis only by using one piece of current diagnosis information, such as short circuit of a DCDC (direct current DC) converter; the partial fault type needs a plurality of pieces of current diagnosis information to judge faults, such as short circuit of vehicle-mounted electrical appliances.
Specifically, the vehicle controller performs fault diagnosis on the low-voltage power supply system according to at least one piece of current diagnosis information to determine the fault diagnosis type of the low-voltage power supply system.
The technical scheme of the embodiment can improve the coverage and the accuracy of the fault diagnosis of the whole vehicle low-voltage power supply so as to meet the overall requirement of the automatic driving level on the power supply and improve the overall safety performance of the vehicle.
Fig. 3 shows a flowchart of a second embodiment of the vehicle low-voltage power failure diagnosis method provided by the invention, which is executed by the vehicle controller. As shown in fig. 3, the method comprises the steps of:
step 210: and acquiring current diagnosis information acquired by each fault diagnosis unit of the vehicle low-voltage power supply system.
Step 220A: when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit corresponding to each low-voltage power supply bus, if one piece of current short-circuit state information corresponding to any vehicle-mounted electric appliance is in a short-circuit state, judging that the low-voltage power supply bus corresponding to the current short-circuit state information is in a short-circuit state, and controlling the on-off control unit on the low-voltage power supply bus to be disconnected.
Wherein, (1) the current short circuit state information is: a short circuit condition occurs or no short circuit condition occurs. (2) The current value of the short circuit state is more than or equal to 200A, and the current value of the non-short circuit state is less than 200A.
Step 220B: when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit corresponding to each low-voltage power supply bus, if the two pieces of current short-circuit state information corresponding to any vehicle-mounted electrical appliance are short-circuit states, judging that the vehicle-mounted electrical appliance is short-circuited, and controlling the on-off control unit on the two paths of low-voltage power supply buses corresponding to the vehicle-mounted electrical appliance to be disconnected.
The specific modes for determining the occurrence of a short circuit in the low-voltage power supply bus and the occurrence of a short circuit in the vehicle-mounted electric appliance are shown in table 1 below, and the state values of the disconnection detecting means are defined in table 2 below. For example, in combination with the low-voltage power supply system shown in fig. 2, if it is diagnosed that the electrical appliance E3 is internally shorted, the vehicle controller controls the KT2 and KT5 to be disconnected through the on-off control unit, so that the A2 power supply bus and the B1 power supply bus are disconnected, and only the electrical appliance E3A, B is simultaneously disconnected at the moment due to the adoption of the array power distribution strategy, and other electrical appliances only can disconnect one of the A, B power supplies at most, so that redundant operation of the vehicle can be ensured, and at the moment, a driver can be prompted that the vehicle is abnormal, and cautious driving or maintenance is required.
Table 1:
table 2:
the technical scheme of the embodiment further accurately locates the short-circuit faults of the vehicle-mounted electrical appliance and the low-voltage power supply bus so as to facilitate fault processing or maintenance, thereby meeting the requirement of automatic driving level on power supply safety design and improving the overall safety performance of the vehicle.
Fig. 4 shows a flowchart of a third embodiment of the vehicle low-voltage power failure diagnosis method provided by the invention, which is executed by the vehicle controller. As shown in fig. 4, the method comprises the steps of:
step 310: and acquiring current diagnosis information acquired by each fault diagnosis unit of the vehicle low-voltage power supply system.
Step 320: and when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit corresponding to each vehicle-mounted electric appliance, respectively generating a voltage diagnosis code of each low-voltage power supply bus based on a preset code diagnosis rule and all pieces of current voltage state information.
Wherein, (1) the current voltage state information is: normal voltage state, low voltage state, high voltage state, or unpowered state. (2) Taking the low voltage power bus B1 as an example, the preset encoding diagnostic rules are shown in table 3 below. (3) The state values of the voltage detection units are shown in table 4 below.
Table 3:
table 4:
step 330: and respectively determining whether each low-voltage power supply bus and the corresponding vehicle-mounted electrical appliance have open-circuit faults or not according to the fault state corresponding to the voltage diagnosis code of each low-voltage power supply bus.
Taking the low-voltage power supply bus B1 as an example, the vehicle-mounted electrical appliances corresponding to the low-voltage power supply bus B1 are E1 to E4. If the voltage diagnostic code obtained according to the current voltage state information provided by the low-voltage power supply bus B1 corresponding to E1-E4 is: 01001000, the fault state is: there is a disconnection of the E1 to E2 transmission lines in the low voltage power bus B1. At this time, the vehicle controller sends out information to prompt the driver to make a fault, the vehicle is abnormal, the driver is required to drive or maintain carefully, meanwhile, the power supply faults of the E2, E3 and E4B paths of the vehicle-mounted electric appliances are caused by the faults, and in order to prevent larger harm, part of functions of the electric appliances E2, E3 and E4 can be degraded.
The technical scheme of the embodiment further adopts an encoding type fault diagnosis strategy to support accurate positioning of the open-circuit faults of the vehicle-mounted electrical appliance and the low-voltage power supply bus so as to facilitate fault processing or maintenance, thereby meeting the requirement of an automatic driving grade on power supply safety design and improving the overall safety performance of the vehicle.
Fig. 5 shows a flowchart of a fourth embodiment of the vehicle low-voltage power failure diagnosis method provided by the invention, which is executed by the vehicle controller. As shown in fig. 5, the method comprises the steps of:
step 410: and acquiring current diagnosis information acquired by each fault diagnosis unit of the vehicle low-voltage power supply system.
Step 420A: when the at least one piece of current diagnosis information is the current voltage state information collected by the voltage detection unit and the current on-off information collected by the on-off control unit corresponding to the DCDC converter, if the current voltage state information is a low-voltage fault and the current on-off information corresponding to the DCDC converter is an unabsorbed state, judging that the low-voltage storage battery has a power supply voltage low fault.
Wherein (1) the low voltage power supply comprises: a low voltage battery and a DCDC dc converter. (2) A short circuit detection unit and an on-off control unit are respectively arranged on the low-voltage storage battery and the DCDC converter, and the low-voltage storage battery and the DCDC converter are connected with a total voltage detection unit.
If it is diagnosed that the low-voltage storage battery has a fault that the power supply voltage is too low, the vehicle controller outputs the fault information, and can cut off part of the electric appliances through the on-off control unit to reduce the load.
Step 420B: when the at least one piece of current diagnosis information is the current short-circuit state information collected by the short-circuit detection unit on the low-voltage storage battery, if the current short-circuit state information corresponding to the low-voltage storage battery is in a short-circuit state, judging that the low-voltage storage battery has a short-circuit fault, and controlling the on-off control unit on the low-voltage storage battery to be disconnected.
If it is diagnosed that the low-voltage storage battery has a short-circuit fault, the vehicle controller can control the on-off control unit to disconnect KT9, so that the low-voltage storage battery is isolated, the whole vehicle is temporarily powered by the DCDC converter, the whole vehicle is ensured to be powered normally in a short time, and a user is required to be prompted about the fault at the moment.
Step 420C: when the at least one piece of current diagnosis information is the current voltage state information collected by the voltage detection unit and the current on-off information collected by the on-off control unit corresponding to the low-voltage storage battery, if the current voltage state information is in a low-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unabsorbed state, judging that the DCDC converter has a fault of excessively low power supply voltage; or if the current voltage state information is in a high-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unabsorbed state, judging that the DCDC converter has a fault of overhigh power supply voltage.
If it is diagnosed that the DCDC converter has too high or too low power supply voltage, the vehicle controller can control the KT10 to be disconnected through the on-off control unit, so that the DCDC converter is isolated, the whole vehicle is temporarily powered by the low-voltage storage battery, the whole vehicle is ensured to be normally powered in a short time, and a user needs to be prompted about the related faults at the moment.
Step 420D: when the at least one piece of current diagnosis information is the current short-circuit state information collected by the short-circuit detection unit of the DCDC converter, if the current short-circuit state information corresponding to the DCDC converter is in a short-circuit state, judging that the DCDC converter has a short-circuit fault, and controlling the on-off control unit on the DCDC converter to be disconnected.
If a short-circuit fault of the DCDC converter is diagnosed, the vehicle controller can control the KT10 to be disconnected through the on-off control unit, so that the DCDC converter is isolated, the whole vehicle is temporarily powered by the low-voltage storage battery, the normal power supply of the whole vehicle is ensured, and a user is required to be prompted about the fault at the moment.
The technical scheme of the embodiment further carries out fault diagnosis on the low-voltage power supply of the vehicle, supports the fault type of the DCDC converter and the low-voltage storage battery to be accurately positioned, and is convenient for carrying out fault treatment or maintenance, thereby meeting the requirement of the automatic driving grade on the power supply safety design and improving the overall safety performance of the vehicle.
Fig. 6 shows a schematic structural view of an embodiment of the vehicle low-voltage power failure diagnosis apparatus of the present invention. As shown in fig. 6, the apparatus 500 includes: an acquisition module 510 and a diagnostic module 520.
An obtaining module 510, configured to obtain current diagnostic information collected by each fault diagnosis unit in the vehicle's low-voltage power supply system;
the diagnosis module 520 is configured to perform fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information.
In an alternative manner, the low voltage power supply system further includes: the system comprises a low-voltage power supply, a plurality of low-voltage power supply buses and a plurality of vehicle-mounted electric appliances distributed according to an array; any fault diagnosis unit is: a voltage detection unit, a short circuit detection unit or an on-off control unit;
the low-voltage power supply supplies power to each low-voltage power supply bus, and each vehicle-mounted electrical appliance is connected with two low-voltage power supply buses respectively;
the low-voltage power supply is provided with a voltage detection unit, at least one short circuit detection unit and at least one on-off control unit, each low-voltage power supply bus is provided with a short circuit detection unit and an on-off control unit, and each power supply connection part of each vehicle-mounted electrical appliance is provided with a voltage detection unit.
In an alternative, the diagnostic module 520 is specifically configured to:
when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit corresponding to each low-voltage power supply bus, if one piece of current short-circuit state information corresponding to any vehicle-mounted electric appliance is in a short-circuit state, judging that the low-voltage power supply bus corresponding to the current short-circuit state information is in a short-circuit state, and controlling the on-off control unit on the low-voltage power supply bus to be disconnected; or if the two pieces of current short-circuit state information corresponding to any vehicle-mounted electric appliance are short-circuit states, judging that the vehicle-mounted electric appliance is short-circuited, and controlling the on-off control units on the two paths of low-voltage power supply buses corresponding to the vehicle-mounted electric appliance to be disconnected.
In an alternative, the diagnostic module 520 is specifically further configured to:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit corresponding to each vehicle-mounted electric appliance, respectively generating a voltage diagnosis code of each low-voltage power supply bus based on a preset code diagnosis rule and all pieces of current voltage state information;
and respectively determining whether each low-voltage power supply bus and the corresponding vehicle-mounted electrical appliance have open-circuit faults or not according to the fault state corresponding to the voltage diagnosis code of each low-voltage power supply bus.
In an alternative way, the low voltage power supply includes: a low voltage battery and a DCDC dc converter; the low-voltage storage battery and the DCDC converter are respectively provided with a short circuit detection unit and an on-off control unit, and are connected with a total voltage detection unit; the diagnostic module 520 is specifically further configured to:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit and the current on-off information acquired by the on-off control unit corresponding to the DCDC converter, if the current voltage state information is a low-voltage fault and the current on-off information corresponding to the DCDC converter is an unabsorbed state, judging that the low-voltage storage battery has a power supply voltage low fault;
or when the at least one piece of current diagnosis information is the current short-circuit state information collected by the short-circuit detection unit on the low-voltage storage battery, if the current short-circuit state information corresponding to the low-voltage storage battery is in a short-circuit state, judging that the low-voltage storage battery has a short-circuit fault, and controlling the on-off control unit on the low-voltage storage battery to be disconnected.
In an alternative, the diagnostic module 520 is specifically further configured to:
when the at least one piece of current diagnosis information is the current voltage state information collected by the voltage detection unit and the current on-off information collected by the on-off control unit corresponding to the low-voltage storage battery, if the current voltage state information is in a low-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unabsorbed state, judging that the DCDC converter has a fault of excessively low power supply voltage; or if the current voltage state information is in a high-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unadsorbed state, judging that the DCDC converter has a fault of overhigh power supply voltage;
or when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit of the DCDC converter, if the current short-circuit state information corresponding to the DCDC converter is in a short-circuit state, judging that the DCDC converter has a short-circuit fault, and controlling the on-off control unit on the DCDC converter to be disconnected.
In an alternative way, any current short circuit state information is: a short-circuit state or no short-circuit state occurs;
wherein, the current value of the short circuit state is more than or equal to 200A, and the current value of the non-short circuit state is less than 200A.
In an alternative way, any current voltage state information is: normal voltage state, low voltage state, high voltage state or unpowered state;
the voltage value range of the normal voltage state is 9-16V, the voltage value range of the low voltage state is 0-9V, the voltage value range of the high voltage state is more than 16V, and the voltage value is not detected in the unpowered state.
The technical scheme of the embodiment can improve the coverage and the accuracy of the fault diagnosis of the power supply of the whole vehicle, so as to meet the overall requirement of the automatic driving level on the power supply and improve the overall safety performance of the vehicle.
The embodiment of the invention provides a computer readable storage medium, which stores at least one executable instruction, and the executable instruction enables a vehicle low-voltage power supply fault diagnosis device to execute the vehicle low-voltage power supply fault diagnosis method in any method embodiment when the executable instruction runs on the vehicle low-voltage power supply fault diagnosis device.
The executable instructions may be specifically for causing a vehicle low-voltage power supply failure diagnosis apparatus to:
acquiring current diagnosis information respectively acquired by each fault diagnosis unit of a vehicle low-voltage power supply system;
and performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information.
In an alternative manner, the low voltage power supply system further includes: the system comprises a low-voltage power supply, a plurality of low-voltage power supply buses and a plurality of vehicle-mounted electric appliances distributed according to an array; any fault diagnosis unit is: a voltage detection unit, a short circuit detection unit or an on-off control unit;
the low-voltage power supply supplies power to each low-voltage power supply bus, and each vehicle-mounted electrical appliance is connected with two low-voltage power supply buses respectively;
the low-voltage power supply is provided with a voltage detection unit, at least one short circuit detection unit and at least one on-off control unit, each low-voltage power supply bus is provided with a short circuit detection unit and an on-off control unit, and each power supply connection part of each vehicle-mounted electrical appliance is provided with a voltage detection unit.
In an alternative manner, the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information includes:
when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit corresponding to each low-voltage power supply bus, if one piece of current short-circuit state information corresponding to any vehicle-mounted electric appliance is in a short-circuit state, judging that the low-voltage power supply bus corresponding to the current short-circuit state information is in a short-circuit state, and controlling the on-off control unit on the low-voltage power supply bus to be disconnected; or if the two pieces of current short-circuit state information corresponding to any vehicle-mounted electric appliance are short-circuit states, judging that the vehicle-mounted electric appliance is short-circuited, and controlling the on-off control units on the two paths of low-voltage power supply buses corresponding to the vehicle-mounted electric appliance to be disconnected.
In an optional manner, the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnostic information further includes:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit corresponding to each vehicle-mounted electric appliance, respectively generating a voltage diagnosis code of each low-voltage power supply bus based on a preset code diagnosis rule and all pieces of current voltage state information;
and respectively determining whether each low-voltage power supply bus and the corresponding vehicle-mounted electrical appliance have open-circuit faults or not according to the fault state corresponding to the voltage diagnosis code of each low-voltage power supply bus.
In an alternative way, the low voltage power supply includes: a low voltage battery and a DCDC dc converter; the low-voltage storage battery and the DCDC converter are respectively provided with a short circuit detection unit and an on-off control unit, and are connected with a total voltage detection unit; the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information further includes:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit and the current on-off information acquired by the on-off control unit corresponding to the DCDC converter, if the current voltage state information is a low-voltage fault and the current on-off information corresponding to the DCDC converter is an unabsorbed state, judging that the low-voltage storage battery has a power supply voltage low fault;
or when the at least one piece of current diagnosis information is the current short-circuit state information collected by the short-circuit detection unit on the low-voltage storage battery, if the current short-circuit state information corresponding to the low-voltage storage battery is in a short-circuit state, judging that the low-voltage storage battery has a short-circuit fault, and controlling the on-off control unit on the low-voltage storage battery to be disconnected.
In an optional manner, the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnostic information further includes:
when the at least one piece of current diagnosis information is the current voltage state information collected by the voltage detection unit and the current on-off information collected by the on-off control unit corresponding to the low-voltage storage battery, if the current voltage state information is in a low-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unabsorbed state, judging that the DCDC converter has a fault of excessively low power supply voltage; or if the current voltage state information is in a high-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unadsorbed state, judging that the DCDC converter has a fault of overhigh power supply voltage;
or when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit of the DCDC converter, if the current short-circuit state information corresponding to the DCDC converter is in a short-circuit state, judging that the DCDC converter has a short-circuit fault, and controlling the on-off control unit on the DCDC converter to be disconnected.
In an alternative way, any current short circuit state information is: a short-circuit state or no short-circuit state occurs;
wherein, the current value of the short circuit state is more than or equal to 200A, and the current value of the non-short circuit state is less than 200A.
In an alternative way, any current voltage state information is: normal voltage state, low voltage state, high voltage state or unpowered state;
the voltage value range of the normal voltage state is 9-16V, the voltage value range of the low voltage state is 0-9V, the voltage value range of the high voltage state is more than 16V, and the voltage value is not detected in the unpowered state.
The technical scheme of the embodiment can improve the coverage and the accuracy of the fault diagnosis of the power supply of the whole vehicle, so as to meet the overall requirement of the automatic driving level on the power supply and improve the overall safety performance of the vehicle.
The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. In addition, embodiments of the present invention are not directed to any particular programming language.
In the description provided herein, numerous specific details are set forth. It will be appreciated, however, that embodiments of the invention may be practiced without such specific details. Similarly, in the above description of exemplary embodiments of the invention, various features of embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. Wherein the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Except that at least some of such features and/or processes or elements are mutually exclusive.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
Claims (10)
1. A vehicle low-voltage power supply failure diagnosis method, characterized by comprising:
acquiring current diagnosis information respectively acquired by each fault diagnosis unit of a vehicle low-voltage power supply system;
and performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information.
2. The method of claim 1, wherein the low voltage power supply system further comprises: the system comprises a low-voltage power supply, a plurality of low-voltage power supply buses and a plurality of vehicle-mounted electric appliances distributed according to an array; any fault diagnosis unit is: a voltage detection unit, a short circuit detection unit or an on-off control unit;
the low-voltage power supply supplies power to each low-voltage power supply bus, and each vehicle-mounted electrical appliance is connected with two low-voltage power supply buses respectively;
the low-voltage power supply is provided with a voltage detection unit, at least one short circuit detection unit and at least one on-off control unit, each low-voltage power supply bus is provided with a short circuit detection unit and an on-off control unit, and each power supply connection part of each vehicle-mounted electrical appliance is provided with a voltage detection unit.
3. The method of claim 2, wherein the step of performing fault diagnosis on the low-voltage power supply system based on at least one current diagnostic information comprises:
when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit corresponding to each low-voltage power supply bus, if one piece of current short-circuit state information corresponding to any vehicle-mounted electric appliance is in a short-circuit state, judging that the low-voltage power supply bus corresponding to the current short-circuit state information is in a short-circuit state, and controlling the on-off control unit on the low-voltage power supply bus to be disconnected; or if the two pieces of current short-circuit state information corresponding to any vehicle-mounted electric appliance are short-circuit states, judging that the vehicle-mounted electric appliance is short-circuited, and controlling the on-off control units on the two paths of low-voltage power supply buses corresponding to the vehicle-mounted electric appliance to be disconnected.
4. The method of claim 2, wherein the step of performing fault diagnosis on the low voltage power supply system based on at least one current diagnostic information further comprises:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit corresponding to each vehicle-mounted electric appliance, respectively generating a voltage diagnosis code of each low-voltage power supply bus based on a preset code diagnosis rule and all pieces of current voltage state information;
and respectively determining whether each low-voltage power supply bus and the corresponding vehicle-mounted electrical appliance have open-circuit faults or not according to the fault state corresponding to the voltage diagnosis code of each low-voltage power supply bus.
5. The method of claim 2, wherein the low voltage power supply comprises: a low voltage battery and a DCDC dc converter; the low-voltage storage battery and the DCDC converter are respectively provided with a short circuit detection unit and an on-off control unit, and are connected with a total voltage detection unit; the step of performing fault diagnosis on the low-voltage power supply system based on at least one piece of current diagnosis information further includes:
when the at least one piece of current diagnosis information is the current voltage state information acquired by the voltage detection unit and the current on-off information acquired by the on-off control unit corresponding to the DCDC converter, if the current voltage state information is a low-voltage fault and the current on-off information corresponding to the DCDC converter is an unabsorbed state, judging that the low-voltage storage battery has a power supply voltage low fault;
or when the at least one piece of current diagnosis information is the current short-circuit state information collected by the short-circuit detection unit on the low-voltage storage battery, if the current short-circuit state information corresponding to the low-voltage storage battery is in a short-circuit state, judging that the low-voltage storage battery has a short-circuit fault, and controlling the on-off control unit on the low-voltage storage battery to be disconnected.
6. The method of claim 5, wherein the step of performing fault diagnosis on the low voltage power supply system based on at least one current diagnostic information further comprises:
when the at least one piece of current diagnosis information is the current voltage state information collected by the voltage detection unit and the current on-off information collected by the on-off control unit corresponding to the low-voltage storage battery, if the current voltage state information is in a low-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unabsorbed state, judging that the DCDC converter has a fault of excessively low power supply voltage; or if the current voltage state information is in a high-voltage state and the current on-off information corresponding to the low-voltage storage battery is in an unadsorbed state, judging that the DCDC converter has a fault of overhigh power supply voltage;
or when the at least one piece of current diagnosis information is the current short-circuit state information acquired by the short-circuit detection unit of the DCDC converter, if the current short-circuit state information corresponding to the DCDC converter is in a short-circuit state, judging that the DCDC converter has a short-circuit fault, and controlling the on-off control unit on the DCDC converter to be disconnected.
7. The method according to any one of claims 3, 5, 6, wherein any one of the current short circuit state information is: a short-circuit state or no short-circuit state occurs;
wherein, the current value of the short circuit state is more than or equal to 200A, and the current value of the non-short circuit state is less than 200A.
8. The method according to any one of claims 4-6, wherein any one of the current voltage status information is: normal voltage state, low voltage state, high voltage state or unpowered state;
the voltage value range of the normal voltage state is 9-16V, the voltage value range of the low voltage state is 0-9V, the voltage value range of the high voltage state is more than 16V, and the voltage value is not detected in the unpowered state.
9. A vehicle low-voltage power supply failure diagnosis apparatus, characterized by comprising:
the acquisition module is used for acquiring current diagnosis information acquired by each fault diagnosis unit in the vehicle low-voltage power supply system respectively;
and the diagnosis module is used for diagnosing faults of the low-voltage power supply system based on at least one piece of current diagnosis information.
10. A computer readable storage medium having stored therein at least one executable instruction that, when run on a vehicle low voltage power supply fault diagnosis device, causes the vehicle low voltage power supply fault diagnosis device to perform the operations of the vehicle low voltage power supply fault diagnosis method of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311345701.4A CN117368788A (en) | 2023-10-17 | 2023-10-17 | Vehicle low-voltage power supply fault diagnosis method, device and computer readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311345701.4A CN117368788A (en) | 2023-10-17 | 2023-10-17 | Vehicle low-voltage power supply fault diagnosis method, device and computer readable storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117368788A true CN117368788A (en) | 2024-01-09 |
Family
ID=89407244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311345701.4A Pending CN117368788A (en) | 2023-10-17 | 2023-10-17 | Vehicle low-voltage power supply fault diagnosis method, device and computer readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117368788A (en) |
-
2023
- 2023-10-17 CN CN202311345701.4A patent/CN117368788A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107681757B (en) | Backup power supply | |
| US10183664B2 (en) | Vehicle system, battery system and control method thereof | |
| US9233610B2 (en) | Apparatus and method of compensating for motor velocity of fuel cell vehicle | |
| US9645185B2 (en) | AC traction motor fault detection using DC bus leakage hardware | |
| US7966110B2 (en) | High-voltage vehicle fault detection method and apparatus | |
| US9696385B2 (en) | Apparatus for detecting the state of a rechargeable battery to be checked | |
| US10407003B2 (en) | Short-circuit protection for vehicle redundant power architecture | |
| DE102013202725A1 (en) | EMERGENCY OPERATING STRATEGY FOR AN ELECTRIC VEHICLE | |
| KR101714243B1 (en) | Apparatus and method for diagonising current sensor of green car | |
| US10730391B2 (en) | Control of redundant power architecture for a vehicle | |
| US11603000B2 (en) | Travel control apparatus | |
| US20170144553A1 (en) | Method and apparatus for controlling a dc/dc power converter | |
| DE102010061618A1 (en) | Control for a hybrid high-voltage insulation protection | |
| DE102017101852B4 (en) | Method of separating a secondary battery and a power supply system | |
| US11981217B2 (en) | System for a drive energy store of a hybrid or electric vehicle, and method for charging a drive energy store of a hybrid or electric vehicle | |
| CN110034555A (en) | Redundant power | |
| CN117368788A (en) | Vehicle low-voltage power supply fault diagnosis method, device and computer readable storage medium | |
| DE102011075982B4 (en) | Method and system for controlling engine torque in hybrid vehicles | |
| CN113002519B (en) | Hybrid vehicle fault processing method and device, electronic equipment and vehicle | |
| DE102014204803B4 (en) | Control strategy for an electric machine in a vehicle | |
| US20210247450A1 (en) | Battery diagnosis apparatus and vehicle | |
| JP6794657B2 (en) | Electric vehicle power system | |
| US20230100819A1 (en) | Interlock system, method, storage medium, and vehicle | |
| CN112389201B (en) | Method and device for controlling balanced emergency power supply of double electrical systems of vehicle | |
| CN115133620A (en) | Power supply circuit, control method and device thereof, and medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |