CN113542085A - Method for rapid fault protection diagnosis of vehicle-mounted power supply - Google Patents
Method for rapid fault protection diagnosis of vehicle-mounted power supply Download PDFInfo
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- 230000007246 mechanism Effects 0.000 claims description 15
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- 238000012544 monitoring process Methods 0.000 claims description 10
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- 230000000630 rising effect Effects 0.000 claims description 6
- 238000012790 confirmation Methods 0.000 abstract description 5
- 230000001052 transient effect Effects 0.000 abstract description 5
- 238000013024 troubleshooting Methods 0.000 abstract description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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Abstract
The invention discloses a method for rapid fault protection diagnosis of a vehicle-mounted power supply, which comprises the following steps: configuring an application program and an upper computer; continuously recording object data to be observed according to a set period; after the data recording is finished, sending diagnosis data to an upper computer through CAN communication; after receiving the data, the upper computer performs graphical display of the data according to the selected channel configuration; and diagnosing whether the fault occurrence belongs to normal triggering or not through the selected fault type. According to the technical scheme, the continuous process data/transient data are monitored by utilizing CAN communication, and the change condition of the us-level key data in each control period is monitored in real time, so that the rapid problem troubleshooting and confirmation are realized.
Description
Technical Field
The invention relates to the field of motor vehicle state monitoring, in particular to a method for rapid fault protection diagnosis of a vehicle-mounted power supply.
Background
There are data showing that the current vehicle-mounted power system, including the OBC/DCDC, is mainly based on two schemes for troubleshooting field problems. The scheme 1 is to read the report message of the power module and analyze the possible problems in the whole process. Scheme 2 is to monitor the actual hardware signal waveform, look for an abnormal waveform, and analyze the cause of the problem.
Scheme 1, limited by the transmission rate of the entire vehicle CAN network, usually collects one frame of data in 10ms or longer. For an ns-grade DSP controller and an us-grade power device, the time is too long, and key information and transient information of real problems can not be acquired at all.
In the scheme 2, the actual hardware signal waveform is monitored, so that the operability is strong in a laboratory, but the operability is difficult to achieve when the power supply system which is loaded is solved, the power supply system is required to be opened, wires are welded on key signals, and an oscilloscope is used for detecting, which is not allowed in the automobile industry, and other problems cannot be caused by the operation of the power supply system. In addition, the signal can only monitor the signal at the input port of the main control chip at most, and the signal actually acquired inside the main control chip cannot be acquired, and the signals are influenced by the configuration inside the common mode/main control chip.
Chinese patent document CN110389301A discloses a "vehicle-mounted power supply monitoring device". Adopts the following steps: the vehicle-mounted power supply comprises an MCU module, Bluetooth and a power supply voltage monitoring circuit, wherein a first output end of the vehicle-mounted power supply is electrically connected with an input end of the power supply voltage monitoring circuit, and an output end of the power supply voltage monitoring circuit is electrically connected with the MCU module; the second output end of the vehicle-mounted power supply is respectively electrically connected with the MCU module and the Bluetooth module to supply power to the vehicle-mounted power supply, the vehicle-mounted power supply monitoring device monitors the output voltage of the vehicle-mounted power supply through the power supply voltage monitoring circuit when working, and when the MCU module monitors that the output voltage of the vehicle-mounted power supply is abnormal, the MCU module transmits abnormal information through the Bluetooth module. The technical scheme is limited by the transmission rate of the CAN network of the whole vehicle, and one frame of data CAN be collected usually within 10ms or longer. For an ns-grade DSP controller and an us-grade power device, the time is too long, and key information and transient information of real problems can not be acquired at all.
Disclosure of Invention
The invention mainly solves the technical problems that the transmission speed of the original technical scheme is low and key information and transient information are difficult to effectively acquire, and provides a method for the rapid fault protection diagnosis of a vehicle-mounted power supply.
The technical problem of the invention is mainly solved by the following technical scheme: the invention comprises the following steps:
s1, configuring an application program and an upper computer;
s2, continuously recording the object data to be observed according to a set period;
s3, when the data recording is finished, sending the diagnosis data to the upper computer through CAN communication;
s4, after receiving the data, the upper computer graphically displays the data according to the selected channel configuration; s5 diagnoses whether the fault occurrence is a normal trigger by the selected fault type.
Preferably, the step S1 of configuring the application program includes declaring a plurality of ring buffer arrays in the application program, where the buffer length of each array is 200-1000, and when monitoring a plurality of process data, declaring a plurality of arrays with the same length, and configuring the data recorded by the application program through an upper computer.
Preferably, the recorded data includes the fast protection fault to be monitored and the critical information fault related to the fault, including but not limited to input and output voltage, current, fault flag bit, working state, and corresponding hardware protection port level.
Preferably, the upper computer configuration comprises that the upper computer sets a plurality of selectable diagnostic fault types, and selects the key data to be monitored. The upper computer has CAN transmitting and receiving functions, supports common CAN communication equipment and supports different baud rate configurations. And the upper computer performs diagnosis fault type selection through a pull-down menu or a mode of selecting one more control. Meanwhile, the method has the function of selecting key data to be monitored, including but not limited to input and output voltage, current, fault marking bits, working state, corresponding hardware protection port level and the like. The upper computer sends the configuration information to the monitored machine/equipment periodically through the confirmation and sending buttons.
Preferably, the step S2 selects the fast failure and critical data to be recorded according to the upper computer instruction, where the recording length is n, and the data is recorded in a loop; when the designated fast failure is triggered, n/2 data are continuously recorded, so that the data amount before and after the designated protection event is equal in the annular array.
Preferably, the step S5 diagnosing the fault types includes determining a hardware overcurrent fault, determining a hardware overvoltage fault, and determining a short-circuit fault. The judgment mechanism of the hardware overvoltage fault comprises the following steps: in a very short time before and after the fault occurrence time, the voltage has an obvious promotion trend, and the level of the corresponding hardware protection port is stably overturned. The judgment mechanism of the hardware overvoltage fault comprises the following steps: in a very short time before and after the fault occurrence time, the current has an obvious promotion trend, and the level of the corresponding hardware protection port is stably overturned. Judgment mechanism about short-circuit failure: in a very short time before and after the fault occurrence time, the output voltage is reduced to 0 in us-level time, and the current reaches a protection threshold value.
Preferably, the mechanism for judging the hardware overcurrent fault specifically includes: firstly, the upper computer judges whether the current diagnosed fault is a hardware overcurrent fault according to the received diagnosis data, if not, the upper computer judges other fault judgment logics, and if so, the upper computer continuously judges whether the level of a hardware overcurrent protection port is stably overturned; if not, the software logic of the fault detection part is mainly checked, the hardware overcurrent fault is judged to be triggered by mistake, and if yes, whether the current has an obvious rising trend and a maximum value at the moment of fault occurrence is continuously judged; if not, the possibility that the hardware overcurrent detection circuit is interfered is checked, the hardware overcurrent fault is judged to be triggered by mistake, and if yes, the hardware overcurrent fault is judged to be really generated.
Preferably, the mechanism for judging the hardware overvoltage fault specifically includes: firstly, the upper computer judges whether the current diagnosed fault is a hardware overvoltage fault or not according to the received diagnosis data, if not, other fault judgment logics are judged, and if yes, whether the level of a hardware overvoltage protection port is stably turned over or not is continuously judged; if not, the software logic of the fault detection part is mainly checked, the hardware overvoltage fault is judged to be triggered by mistake, and if yes, whether the voltage has an obvious rising trend and a maximum value at the moment of fault occurrence is continuously judged; if not, the possibility that the hardware overvoltage detection circuit is interfered is checked, the hardware overvoltage fault is judged to be triggered by mistake, and if yes, the hardware overvoltage fault is judged to be really generated.
Preferably, the mechanism for determining the short-circuit fault specifically includes: firstly, the upper computer judges whether the current diagnosed fault is a short-circuit fault according to the received diagnosis data, if not, the upper computer judges other fault judgment logics, and if so, the upper computer continuously judges whether the current reaches a protection threshold value before and after the fault occurs; if not, the short-circuit fault is judged to be triggered by mistake, if yes, whether the voltage drops to 0 in a very short time before and after the fault occurrence marking position is continued, if not, the short-circuit fault is judged to be triggered by mistake, and if yes, the short-circuit fault is judged to be actually occurred.
The invention has the beneficial effects that: the method has the advantages that the continuous process data/transient data are monitored by CAN communication, the change condition of each us-level key data in each control period is monitored in real time, rapid problem troubleshooting and confirmation are realized, the process state of the key data is monitored in a software oscilloscope mode when the field problems are debugged, relevant software oscilloscope messages are recorded by a field engineer, problems are rapidly diagnosed, and a solution is provided.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a timing diagram of a data storage portion software design of the present invention.
Fig. 3 is a waveform diagram of a snapshot information record at the occurrence time of a short-circuit fault according to the present invention.
FIG. 4 is a flow chart of data storage according to the present invention.
FIG. 5 is a logic diagram of the diagnosis related to the hardware overcurrent protection of the host computer according to the present invention.
FIG. 6 is a logic diagram of the upper level of the present invention for diagnosing over-voltage protection of hardware.
FIG. 7 is a diagnostic logic diagram of a host computer for short circuit protection in accordance with the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the method for the rapid fault protection diagnosis of the vehicle-mounted power supply of the embodiment, as shown in fig. 1, includes the following steps:
and S1, configuring the application program and the upper computer.
As shown in fig. 2, the application configuration includes declaring a plurality of ring-shaped cache arrays in the application, where the cache length of each array is 200 and 1000, and when monitoring a plurality of process data, declaring a plurality of arrays with the same length, and configuring data recorded by the application through an upper computer. The recorded data includes fast protection faults that need to be monitored and fault-related critical information faults including, but not limited to, input and output voltages, currents, fault flag bits, operating conditions, corresponding hardware protection port levels.
The upper computer configuration comprises the steps that the upper computer sets a plurality of selectable diagnostic fault types, and key data needing to be monitored are selected. The upper computer has CAN transmitting and receiving functions, supports common CAN communication equipment and supports different baud rate configurations. And the upper computer performs diagnosis fault type selection through a pull-down menu or a mode of selecting one more control. Meanwhile, the method has the function of selecting key data to be monitored, including but not limited to input and output voltage, current, fault marking bits, working state, corresponding hardware protection port level and the like. The upper computer sends the configuration information to the monitored machine/equipment periodically through the confirmation and sending buttons. S2 as shown in figure 4, continuously recording object data to be observed according to a set period, selecting rapid fault and key data to be recorded according to an upper computer instruction, wherein the recording length is n, and recording the data circularly; when the designated fast failure is triggered, n/2 data are continuously recorded, so that the data amount before and after the designated protection event is equal in the annular array.
S3, when the data recording is finished, sending the diagnosis data to the upper computer through CAN communication;
s4, after receiving the data, the upper computer graphically displays the data according to the selected channel configuration; and S5, diagnosing whether the fault is normally triggered or not according to the selected fault type, wherein the fault type diagnosis comprises hardware overcurrent fault judgment, hardware overvoltage fault judgment and short-circuit fault judgment.
As shown in fig. 5, the mechanism for determining the hardware overcurrent fault specifically includes: firstly, the upper computer judges whether the current diagnosed fault is a hardware overcurrent fault according to the received diagnosis data, if not, the upper computer judges other fault judgment logics, and if so, the upper computer continuously judges whether the level of a hardware overcurrent protection port is stably overturned; if not, the software logic of the fault detection part is mainly checked, the hardware overcurrent fault is judged to be triggered by mistake, and if yes, whether the current has an obvious rising trend and a maximum value at the moment of fault occurrence is continuously judged; if not, the possibility that the hardware overcurrent detection circuit is interfered is checked, the hardware overcurrent fault is judged to be triggered by mistake, and if yes, the hardware overcurrent fault is judged to be really generated.
As shown in fig. 6, the mechanism for determining the hardware overvoltage fault specifically includes: firstly, the upper computer judges whether the current diagnosed fault is a hardware overvoltage fault or not according to the received diagnosis data, if not, other fault judgment logics are judged, and if yes, whether the level of a hardware overvoltage protection port is stably turned over or not is continuously judged; if not, the software logic of the fault detection part is mainly checked, the hardware overvoltage fault is judged to be triggered by mistake, and if yes, whether the voltage has an obvious rising trend and a maximum value at the moment of fault occurrence is continuously judged; if not, the possibility that the hardware overvoltage detection circuit is interfered is checked, the hardware overvoltage fault is judged to be triggered by mistake, and if yes, the hardware overvoltage fault is judged to be really generated.
As shown in fig. 7, the judging mechanism of the short-circuit fault specifically includes: firstly, the upper computer judges whether the current diagnosed fault is a short-circuit fault according to the received diagnosis data, if not, the upper computer judges other fault judgment logics, and if so, the upper computer continuously judges whether the current reaches a protection threshold value before and after the fault occurs; if not, the short-circuit fault is judged to be triggered by mistake, if yes, whether the voltage drops to 0 in an extremely short time before and after the fault occurrence marking position is continued, the oscillogram is shown in figure 3 during the short-circuit fault, if not, the short-circuit fault is judged to be triggered by mistake, and if yes, the short-circuit fault is judged to be actually occurred.
Regarding the design of monitoring part codes in an application program:
step 101: several ring buffer arrays are declared in the application program (the number of the array is 4 in consideration of actual diagnosis needs), the buffer length of each array is 200 and 1000 (the array length can be flexibly allocated according to diagnosis needs and chip resource conditions), and if a plurality of process data need to be monitored, a plurality of arrays with the same length need to be declared. The recorded data can be configured through an upper computer, and mainly comprises (1) the key information related to the rapid protection fault (2) to be monitored, including but not limited to input and output voltage, current, fault marking position, working state, corresponding hardware protection port level and the like.
Step 102: the data of the object to be observed is continuously recorded in a period of 10-100us (limited by the control period of the power module), and the data of the object is continuously recorded for a period of time after the specified protection event is triggered, so that the data amount before and after the specified protection event occurs in the annular array is equal.
Step 103: and after the data recording is finished, sending the diagnosis data to an upper computer through CAN communication.
1. Design of monitoring upper computer
Step 201: the upper computer has CAN transmitting and receiving functions, supports common CAN communication equipment and supports different baud rate configurations.
Step 202: the upper computer has a function of diagnosing fault type selection, and selection is carried out in a mode of pulling down a menu or selecting 1 control more. Meanwhile, the method should have the function of selecting key data to be monitored, including but not limited to input and output voltage, current, fault flag bit, working state, corresponding hardware protection port level, and the like.
Step 203: the upper computer sends the configuration information to the monitored machine/equipment periodically through the confirmation and sending buttons, and the selection of the diagnosis fault type is realized.
Step 204: and after receiving the data, the upper computer performs graphical display of the data according to the selected channel configuration. And through the selected fault type, whether the fault occurrence belongs to normal triggering is diagnosed.
Judgment mechanism about short-circuit failure: in a very short time before and after the fault occurrence time, the output voltage is reduced to 0 in us-level time, and the current reaches a protection threshold value.
The judgment mechanism of the hardware overvoltage fault comprises the following steps: in a very short time before and after the fault occurrence time, the voltage has an obvious promotion trend, and the level of the corresponding hardware protection port is stably overturned.
The judgment mechanism of the hardware overvoltage fault comprises the following steps: in a very short time before and after the fault occurrence time, the current has an obvious promotion trend, and the level of the corresponding hardware protection port is stably overturned.
Application example: the scheme is used for diagnosing the short-circuit fault of the ACDC model, and the real short-circuit condition of the output end of the locking system is shown in figure 3.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the terms application, host computer, fault type, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (9)
1. A method for rapid fault protection diagnosis of a vehicle-mounted power supply is characterized by comprising the following steps: s1, configuring an application program and an upper computer;
s2, continuously recording the object data to be observed according to a set period;
s3, when the data recording is finished, sending the diagnosis data to the upper computer through CAN communication;
s4, after receiving the data, the upper computer graphically displays the data according to the selected channel configuration;
s5 diagnoses whether the fault occurrence is a normal trigger by the selected fault type.
2. The method as claimed in claim 1, wherein the step S1 of configuring the application program includes declaring a plurality of ring buffer arrays in the application program, where the buffer length of each array is 200 and 1000, and when monitoring a plurality of process data, declaring a plurality of arrays with the same length, and configuring data recorded by the application program through the upper computer.
3. The method for vehicle power supply fast fault protection diagnosis according to claim 2, wherein the recorded data includes fast protection faults to be monitored and fault-related critical information faults, wherein the related critical information includes but is not limited to input and output voltage, current, fault flag bit, working state, corresponding hardware protection port level.
4. The method for the rapid fault protection diagnosis of the vehicle-mounted power supply according to claim 1, wherein the configuration of the upper computer comprises the steps that the upper computer sets a plurality of selectable diagnosis fault types, and key data needing to be monitored are selected.
5. The method for the rapid fault protection diagnosis of the vehicle-mounted power supply according to claim 1, wherein the step S2 is to select the rapid fault and the critical data to be recorded according to the upper computer instruction, the recording length is n, and the data are recorded cyclically; when the designated fast failure is triggered, n/2 data are continuously recorded, so that the data amount before and after the designated protection event is equal in the annular array.
6. The method for rapid fault protection diagnosis of the on-board power supply according to claim 1, wherein the step S5 diagnoses fault types including hardware overcurrent fault diagnosis, hardware overvoltage fault diagnosis and short-circuit fault diagnosis.
7. The method for rapid fault protection and diagnosis of the vehicle-mounted power supply according to claim 6, wherein the mechanism for judging the hardware overcurrent fault specifically comprises: firstly, the upper computer judges whether the current diagnosed fault is a hardware overcurrent fault according to the received diagnosis data, if not, the upper computer judges other fault judgment logics, and if so, the upper computer continuously judges whether the level of a hardware overcurrent protection port is stably overturned; if not, the software logic of the fault detection part is mainly checked, the hardware overcurrent fault is judged to be triggered by mistake, and if yes, whether the current has an obvious rising trend and a maximum value at the moment of fault occurrence is continuously judged; if not, the possibility that the hardware overcurrent detection circuit is interfered is checked, the hardware overcurrent fault is judged to be triggered by mistake, and if yes, the hardware overcurrent fault is judged to be really generated.
8. The method for rapid fault protection diagnosis of the vehicle-mounted power supply according to claim 6, wherein the judgment mechanism of the hardware overvoltage fault specifically comprises: firstly, the upper computer judges whether the current diagnosed fault is a hardware overvoltage fault or not according to the received diagnosis data, if not, other fault judgment logics are judged, and if yes, whether the level of a hardware overvoltage protection port is stably turned over or not is continuously judged; if not, the software logic of the fault detection part is mainly checked, the hardware overvoltage fault is judged to be triggered by mistake, and if yes, whether the voltage has an obvious rising trend and a maximum value at the moment of fault occurrence is continuously judged; if not, the possibility that the hardware overvoltage detection circuit is interfered is checked, the hardware overvoltage fault is judged to be triggered by mistake, and if yes, the hardware overvoltage fault is judged to be really generated.
9. The method for the rapid fault protection diagnosis of the vehicle-mounted power supply according to claim 6, wherein the judgment mechanism of the short-circuit fault specifically comprises: firstly, the upper computer judges whether the current diagnosed fault is a short-circuit fault according to the received diagnosis data, if not, other fault judgment logics are judged, and if yes, whether the current reaches a protection trigger point before and after the fault occurs is continuously judged; if not, the short-circuit fault is judged to be triggered by mistake, if yes, whether the voltage drops to 0 in a very short time before and after the fault occurrence marking position is continued, if not, the short-circuit fault is judged to be triggered by mistake, and if yes, the short-circuit fault is judged to be actually occurred.
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| CN114637276A (en) * | 2022-03-30 | 2022-06-17 | 北京英创汇智科技有限公司 | Fault diagnosis system and method for ABS (anti-lock brake system) |
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