CN112670957A - Vehicle-mounted DC/DC overcurrent diagnosis method and device and computer readable storage medium - Google Patents
Vehicle-mounted DC/DC overcurrent diagnosis method and device and computer readable storage medium Download PDFInfo
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Abstract
The invention provides an over-current diagnosis method and device of a vehicle-mounted DC/DC, on the basis of the existing over-current protection circuit, after a control unit receives an over-current fault signal, the control unit resets a latch unit in different time intervals according to the characteristics of different over-current fault types, and the over-current fault type is identified through the reset time and the reset times. By applying the scheme provided by the invention, the types of overcurrent faults can be effectively distinguished under the condition of not changing a hardware circuit, the power-off frequency of the vehicle-mounted DC/DC caused by load change is reduced, and the robustness of the vehicle-mounted DC/DC is improved.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted power supplies, in particular to a vehicle-mounted DC/DC over-current diagnosis method and device and a computer readable storage medium.
Background
For the vehicle-mounted DC/DC, because the application working condition is complex, the overcurrent often occurs, in order to protect the components in the vehicle-mounted DC/DC, an overcurrent protection circuit is designed in the vehicle-mounted DC/DC, and when the overcurrent occurs, the current in the overcurrent protection circuit is cut off, and the vehicle-mounted DC/DC is powered off. The following description will be made of the vehicle-mounted DC/DC and its overcurrent protection circuit, taking 48V vehicle-mounted DC/DC as an example.
The 48V vehicle-mounted DC/DC is used as a core component in a 48V system, and is used for converting 48V direct current into 12V direct current and supplying power to a 12V load, fig. 1 is a voltage network commonly used in the 48V system, and includes a 48V voltage network and a 12V voltage network, and the 12V voltage network of the whole vehicle includes a low-voltage battery, a 12V load, and a starter (optional).
In practical application, the application condition of the vehicle-mounted DC/DC is complex, and the following three conditions exist: 1. the 12V load comprises various electric devices, the load condition can frequently generate violent change, so that short-time peak appears in the current of the 12V voltage network, the type of overcurrent fault caused by the working condition is instantaneous overcurrent, and the overcurrent protection device is characterized in that the overcurrent duration A is instantaneous; 2. the short-time overcurrent of the vehicle-mounted DC/DC is caused by the change of the load, for example, for a hybrid power system with a starter, the whole vehicle can trigger larger short-time current when being started to cause the vehicle-mounted DC/DC overcurrent, and the type of overcurrent fault caused by the working condition is the short-time overcurrent, and the short-time overcurrent; 3. the short circuit of the load causes the long-time overcurrent of the vehicle-mounted DC/DC, and the type of the overcurrent fault caused by the working condition is the long-time overcurrent, and the short-circuit type DC/DC overcurrent protection device is characterized in that the overcurrent duration time C is very long, and the overcurrent phenomenon is continued all the time unless a short-circuit loop is disconnected.
Fig. 2 is an overcurrent protection circuit diagram of a 48V vehicle-mounted DC/DC, in which a current sampling unit converts a current signal into a voltage signal Vs, a comparator compares the voltage signal Vs with a reference voltage Vr, when Vs is greater than Vr, it is determined that an overcurrent occurs in the vehicle-mounted DC/DC, at this time, a fault determination unit raises an overcurrent protection signal OCP _ Enb, so as to shut down a DC/DC power unit and achieve a safe state, and at the same time, a latch unit latches the overcurrent fault signal OCP _ Enb and sends an overcurrent fault signal to a control unit, and the control unit powers down the vehicle-mounted DC/DC. When the control unit receives a power-on command of an upper system such as a VCU, the control unit sends a Reset instruction to the latch to clear an overcurrent fault signal OCP _ Enb in the latch unit, so that the vehicle-mounted DC/DC is powered on and works again.
In the prior art, because the control unit cannot correctly distinguish the overcurrent fault type caused by the overcurrent working condition, once the vehicle-mounted DC/DC has overcurrent fault, the control unit can power down the vehicle-mounted DC/DC, so that the vehicle-mounted DC/DC is powered up and down frequently due to load change, and the robustness of the vehicle-mounted DC/DC is poor.
Disclosure of Invention
The invention aims to provide an over-current diagnosis method and device of a vehicle-mounted DC/DC and a computer readable storage medium, so as to effectively distinguish the type of over-current fault, reduce the power-off frequency of the vehicle-mounted DC/DC caused by load change and improve the robustness of the vehicle-mounted DC/DC. The specific technical scheme is as follows:
in a first aspect, the present invention provides an on-board DC/DC overcurrent diagnosis method, applied to a control unit in an on-board DC/DC overcurrent protection circuit, the method including:
resetting the latch unit after a first preset time length after receiving a first overcurrent fault signal aiming at any diagnosis period;
judging whether an overcurrent fault signal is received within a second preset time after the reset;
if not, judging that the overcurrent fault of the current diagnosis period is an instantaneous overcurrent fault;
if yes, resetting the latch unit after the first preset time length after receiving the overcurrent fault signal;
continuously receiving an overcurrent fault signal;
judging whether the reset times of the current diagnosis period reach the preset maximum reset times or not;
if not, resetting the latch unit after the first preset time after receiving the overcurrent fault signal, and returning to execute the step of continuously receiving the overcurrent fault signal;
if yes, resetting the latch unit after a third preset time after receiving the overcurrent fault signal;
judging whether an overcurrent fault signal is received within a fourth preset time after the reset;
if not, judging that the overcurrent fault of the current diagnosis period is a short-time overcurrent fault;
and if so, judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault.
Optionally, the first preset time length, the second preset time length, the third preset time length and the fourth preset time length are calibrated according to the following manner:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, and T4 respectively indicate the first preset time, the second preset time, the third preset time, and the fourth preset time, a indicates a preset maximum reset number, a indicates a duration of an instantaneous overcurrent fault, B indicates a duration of a short-time overcurrent fault, and C indicates a duration of a long-time overcurrent fault.
Optionally, the maximum number of times of resetting is greater than or equal to 3.
Optionally, the method further includes:
and when the overcurrent fault of the current diagnosis period is judged to be a long overcurrent, controlling the vehicle-mounted DC/DC to be powered off.
Optionally, the method further includes:
when the overcurrent fault of the current diagnosis period is judged to be an instantaneous overcurrent fault, instantaneous overcurrent fault information is sent to an upper-layer system; and/or the presence of a gas in the gas,
when the overcurrent fault of the current diagnosis period is judged to be a short-time overcurrent fault, sending short-time overcurrent fault information to an upper-layer system; and/or the presence of a gas in the gas,
and when judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault, sending long-term overcurrent fault information to an upper-layer system.
Based on the same inventive concept, the invention also provides an over-current diagnosis device of the vehicle-mounted DC/DC, which is applied to a control unit in an over-current protection circuit of the vehicle-mounted DC/DC, and comprises:
the first reset module is used for resetting the latch unit after a first preset time length after receiving a first overcurrent fault signal aiming at any diagnosis period;
the first judgment module is used for judging whether an overcurrent fault signal is received within a second preset time after the reset; if not, triggering the first judging module, and if so, triggering the second resetting module;
the first judging module is used for judging that the overcurrent fault of the current diagnosis period is an instantaneous overcurrent fault;
the second reset module is used for resetting the latch unit after receiving the first preset time length after receiving the overcurrent fault signal;
the receiving module is used for continuously receiving the overcurrent fault signal;
the second judgment module is used for judging whether the reset times of the current diagnosis period reach the preset maximum reset times or not; if not, triggering a third resetting module, and if so, triggering a fourth resetting module;
the third reset module is used for resetting the latch unit after receiving the first preset time after the overcurrent fault signal is received, and triggering the receiving module;
the fourth reset module is used for resetting the latch unit after receiving a third preset time length after receiving the overcurrent fault signal;
the third judgment module is used for judging whether an overcurrent fault signal is received within a fourth preset time after resetting; if not, triggering a second judging module, and if so, triggering a third judging module;
the second judging module is used for judging that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault;
and the third judging module is used for judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault.
Optionally, the first preset time length, the second preset time length, the third preset time length and the fourth preset time length are calibrated according to the following manner:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, and T4 respectively indicate the first preset time, the second preset time, the third preset time, and the fourth preset time, a indicates a preset maximum reset number, a indicates a duration of an instantaneous overcurrent fault, B indicates a duration of a short-time overcurrent fault, and C indicates a duration of a long-time overcurrent fault.
Optionally, the maximum number of times of resetting is greater than or equal to 3.
Optionally, the apparatus further comprises:
and the power-off module is used for controlling the vehicle-mounted DC/DC to be powered off when the third judging module judges that the overcurrent fault of the current diagnosis period is a long overcurrent.
Optionally, the apparatus further comprises:
the sending module is used for sending instantaneous overcurrent fault information to an upper-layer system when the first judging module judges that the overcurrent fault in the current diagnosis period is the instantaneous overcurrent fault; and/or when the second determination module determines that the overcurrent fault of the current diagnosis period is a short-time overcurrent fault, sending short-time overcurrent fault information to an upper-layer system; and/or when the third judging module judges that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault, sending long-term overcurrent fault information to an upper-layer system.
Based on the same inventive concept, the invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, can implement the on-board DC/DC over-current diagnosis method of the invention.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the technical scheme, instantaneous overcurrent faults, short-time overcurrent faults and long-time overcurrent faults can be effectively distinguished, and then the vehicle-mounted DC/DC is subjected to power-off processing based on the fault type, so that the power-off frequency of the vehicle-mounted DC/DC caused by load change can be effectively reduced, and the robustness of the vehicle-mounted DC/DC is improved;
2. the technical scheme of the invention can be realized based on the existing overcurrent protection circuit, and a hardware circuit is not required to be changed, thereby avoiding the increase of the manufacturing cost;
3. the four preset durations and the maximum resetting times in the technical scheme of the invention can be calibrated according to the whole vehicle working condition of vehicle-mounted DC/DC application, and the application range is wide.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a 48V system voltage network;
FIG. 2 is a schematic diagram of an on-board DC/DC overcurrent protection circuit;
FIG. 3 is a schematic flow chart of an on-board DC/DC overcurrent diagnosis method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an on-vehicle DC/DC overcurrent diagnosis apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings in order to make the objects and features of the present invention more comprehensible, however, the present invention may be realized in various forms and should not be limited to the embodiments described above. Furthermore, it will be understood that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer program instructions. It is well known to those skilled in the art that implementation by hardware, by software, and by a combination of software and hardware are equivalent.
In order to solve the problems that the prior art cannot distinguish the type of overcurrent faults, so that the power-off frequency of the vehicle-mounted DC/DC is high due to load change, and the robustness of the vehicle-mounted DC/DC is poor, the embodiment of the invention provides an overcurrent diagnosis method and device of the vehicle-mounted DC/DC, and a computer readable storage medium.
First, an over-current diagnosis method of a vehicle-mounted DC/DC according to an embodiment of the present invention is described below.
Fig. 3 is a schematic flowchart of an over-current diagnosis method for vehicle-mounted DC/DC according to an embodiment of the present invention. The vehicle-mounted DC/DC can be 48V DC/DC or other types of high-voltage DC/DC, and can be applied to pure electric vehicles, fuel cell vehicles, hybrid vehicles and other vehicle types.
The over-current diagnosis method can be applied to a control unit in an over-current protection circuit of the vehicle-mounted DC/DC. Taking the 48V vehicle-mounted DC/DC overcurrent protection circuit shown in fig. 2 as an example, the vehicle-mounted DC/DC overcurrent protection circuit may further include a fault determination unit, a latch unit, and a DC/DC power unit. The fault judging unit is used for judging whether an overcurrent fault occurs in the vehicle-mounted DC/DC, if so, the fault judging unit can set the overcurrent protection signal sent to the latching unit high so as to close the DC/DC power unit, meanwhile, the latching unit latches the overcurrent fault signal sent to the control unit, namely, the overcurrent fault signal is sent to the control unit, and the control unit receives the overcurrent fault signal and determines the type of the overcurrent fault according to the overcurrent diagnosis method provided by the embodiment.
In each diagnosis period, the type of the overcurrent fault of the current period can be determined according to the overcurrent diagnosis method of the vehicle-mounted DC/DC shown in FIG. 3. The diagnosis period can be understood as: and for each overcurrent fault, defining a diagnosis period from the moment when the first overcurrent fault signal is received to the moment when the type of the overcurrent fault is diagnosed.
Specifically, referring to fig. 3, an over-current diagnosis method for vehicle-mounted DC/DC may include the following steps:
step S101, resetting a latch unit after a first preset time length after receiving a first overcurrent fault signal; specifically, the control unit sends a Reset instruction to the latch unit to clear the fault of the latch unit, so that the DC/DC power unit is restarted, and the vehicle-mounted DC/DC power unit is enabled to work normally;
step S102, judging whether an overcurrent fault signal is received within a second preset time after reset; if not, executing step S103; if yes, go to step S104;
step S103, judging that the overcurrent fault of the current diagnosis period is an instantaneous overcurrent fault;
step S104, resetting the latch unit after the first preset time after receiving the overcurrent fault signal;
step S105, continuously receiving an overcurrent fault signal;
step S106, judging whether the reset times of the current diagnosis period reach the preset maximum reset times or not; if not, executing step S107; if yes, go to step S108;
step S107, resetting the latch unit after the first preset duration after receiving the overcurrent fault signal, and returning to the step S105 to continue receiving the overcurrent fault signal;
step S108, resetting the latch unit after a third preset time after receiving the overcurrent fault signal;
step S109, judging whether an overcurrent fault signal is received within a fourth preset time after the reset; if not, executing step S110; if yes, executing step S111;
step S110, judging that the overcurrent fault of the current diagnosis period is a short-time overcurrent fault;
and step S111, judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault.
It should be noted that the over-current diagnosis method provided by the embodiment involves four preset durations, namely, a first preset duration T1, a second preset duration T2, a third preset duration T3, and a fourth preset duration T4. Through research and analysis, the inventor finds that overcurrent faults caused by load change are divided into three types: the fault detection circuit comprises an instantaneous overcurrent fault, a short-time overcurrent fault and a long-time overcurrent fault, wherein the duration of the instantaneous overcurrent fault is shorter than that of the short-time overcurrent fault, and the duration of the long-time overcurrent fault is longest.
Since the different types of over-current faults have different durations, the core idea of the invention is to distinguish the types of over-current faults based on the durations of the over-current faults. Therefore, the four preset durations are calibrated according to the durations of the three types of overcurrent faults, and specifically, the relationship between the four preset durations and the durations of the three types of overcurrent faults is as follows:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, and T4 respectively indicate the first preset time, the second preset time, the third preset time, and the fourth preset time, a indicates a preset maximum reset number, a indicates a duration of an instantaneous overcurrent fault, B indicates a duration of a short-time overcurrent fault, and C indicates a duration of a long-time overcurrent fault.
In this embodiment, the preset maximum reset time is greater than or equal to 3. In practical application, the four preset durations and the maximum resetting times can be calibrated according to the whole vehicle working condition of the vehicle-mounted DC/DC application.
For steps S101 to S103, the control unit resets the latch unit after a first preset time period after receiving the first overcurrent fault signal, and determines whether the overcurrent fault signal is received within a second preset time period after the resetting. Since the first preset duration is longer than the duration of the instantaneous overcurrent fault, if the type of the current overcurrent fault is instantaneous overcurrent, the current overcurrent fault is already eliminated at the moment of resetting the latch unit, and therefore the control unit does not receive a new overcurrent fault signal within the second preset duration after resetting.
Therefore, if it is determined in step S102 that the overcurrent fault signal is not received within the second preset time period after the resetting, it may be determined that the type of the current overcurrent fault is an instantaneous overcurrent fault, and this diagnosis period is ended. On the contrary, if it is determined in step S102 that a new overcurrent fault signal is received within the second preset time period after the reset, it indicates that the type of the current overcurrent fault is not an instantaneous overcurrent fault, and it needs to further determine whether the current overcurrent fault is a short-time overcurrent fault or a long-time overcurrent fault.
If it is determined in step S102 that a new overcurrent fault signal is received within the second preset time period after the reset, the latch unit is reset after the first preset time period after the new overcurrent fault is received, so that the DC/DC power unit is turned on again, and the vehicle-mounted DC/DC works normally again. No matter short-time overcurrent fault or long-time overcurrent fault, after the latching unit is reset in step S104 so that the on-board DC/DC operates normally again, overcurrent still occurs in the on-board DC/DC, and therefore, the control unit continues to receive the overcurrent fault signal in step S105.
For step S105, after the control unit receives the overcurrent fault signal, the control unit continues to execute step S106 to determine whether the reset time of the current diagnosis period reaches the preset maximum reset time. And if the maximum reset times are not reached, continuously monitoring the overcurrent fault signal until the reset times reach the maximum reset times.
Since the present embodiment sets the product of the sum of the first preset time and the second preset time and the maximum reset time to be less than the duration of the short-time overcurrent fault (i.e., (T1+ T2) × a < B), and the product of the sum of the first preset time and the second preset time and the maximum reset time is further summed with the third preset time to be greater than the duration of the short-time overcurrent (i.e., (T1+ T2) × a + T3 > B), if the current type of the overcurrent fault is the short-time overcurrent, when the overcurrent fault signal is received and the reset time reaches the maximum reset time, it means that the short-time overcurrent fault is about to disappear, at this time, step S108 is executed to reset the latch unit after receiving the third preset time after the overcurrent fault signal, the short-time overcurrent fault is eliminated at the time of the reset, and step S109 is executed to determine whether the overcurrent fault signal is received within the fourth preset time after the reset, if not, it can be determined that the current overcurrent fault type is short-term overcurrent.
If it is assumed that the type of the current overcurrent fault is a long-term overcurrent, the overcurrent will last for a long time, and therefore, in this embodiment, (T1+ T2) × a + T3+ T4 < C) is set, then, after the control unit resets the latch unit after receiving the overcurrent fault signal for the third preset time period in step S108, the control unit will still receive the overcurrent fault signal within the fourth preset time period after resetting, and therefore, when the control unit determines that the overcurrent fault signal is received within the fourth preset time period after resetting in step S109, it may be determined that the type of the current overcurrent fault is the long-term overcurrent.
In this embodiment, in each diagnosis period, the control unit responds to the overcurrent fault signal by the above method, and can effectively distinguish an instantaneous overcurrent fault, a short-time overcurrent fault and a long-time overcurrent fault. Because the duration of the instantaneous overcurrent fault and the short-time overcurrent fault is relatively short, and the influence on the vehicle-mounted DC/DC is small, when the overcurrent fault type in the current diagnosis period is judged to be the instantaneous overcurrent fault and the short-time overcurrent fault, the DC/DC is not required to be powered off, and only when the overcurrent fault type in the current diagnosis period is diagnosed to be the long-time overcurrent, the control unit controls the vehicle-mounted DC/DC to be powered off, so that the power-off frequency of the vehicle-mounted DC/DC caused by load change can be effectively reduced, and the robustness of the vehicle-mounted DC/DC is improved.
Further, the overcurrent diagnosis method for the vehicle-mounted DC/DC provided by the embodiment may further include:
when the overcurrent fault of the current diagnosis period is judged to be an instantaneous overcurrent fault, instantaneous overcurrent fault information is sent to an upper-layer system; and/or the presence of a gas in the gas,
when the overcurrent fault of the current diagnosis period is judged to be a short-time overcurrent fault, sending short-time overcurrent fault information to an upper-layer system; and/or the presence of a gas in the gas,
and when judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault, sending long-term overcurrent fault information to an upper-layer system.
The upper system may be a component for controlling the Vehicle-mounted DC/DC power supply in the electric Vehicle, for example, a core component VCU (Vehicle Control Unit) of a Vehicle Control system of the electric Vehicle. And after judging the type of the overcurrent fault, sending corresponding overcurrent fault information to an upper-layer system, wherein the overcurrent fault information can comprise the starting time and the ending time of the overcurrent fault, so that the upper-layer system can perform statistical analysis on the fault information and calibrate the four preset durations and the maximum resetting times according to the analysis result.
Based on the same inventive concept, an embodiment of the invention also provides an over-current diagnosis device of the vehicle-mounted DC/DC, which is applied to a control unit in an over-current protection circuit of the vehicle-mounted DC/DC. Referring to fig. 2, fig. 2 is a schematic structural diagram of an on-board DC/DC overcurrent diagnosis device according to an embodiment of the present invention, where the on-board DC/DC overcurrent diagnosis device may include: the first reset module 201, the first determining module 202, the first determining module 203, the second reset module 204, the receiving module 205, the second determining module 206, the third reset module 207, the fourth reset module 208, the third determining module 209, the second determining module 210, and the third determining module 211.
The first resetting module 201 is configured to reset the latch unit after a first preset time length after receiving a first overcurrent fault signal for any one diagnostic period;
the first judging module 202 is configured to judge whether an overcurrent fault signal is received within a second preset time period after the reset; if not, triggering a first judging module 203, and if yes, triggering a second resetting module 204;
the first determining module 203 is configured to determine that the overcurrent fault in the current diagnostic period is an instantaneous overcurrent fault;
the second resetting module 204 is configured to reset the latch unit after receiving the first preset time after receiving the overcurrent fault signal;
a receiving module 205, configured to continue to receive the overcurrent fault signal;
a second determining module 206, configured to determine whether the reset time of the current diagnosis period reaches a preset maximum reset time; if not, triggering a third reset module 207, and if yes, triggering a fourth reset module 208;
the third resetting module 207 is configured to reset the latch unit after receiving the first preset time after receiving the overcurrent fault signal, and trigger the receiving module 205;
the fourth resetting module 208 is configured to reset the latch unit after a third preset time period after receiving the overcurrent fault signal;
a third determining module 209, configured to determine whether an overcurrent fault signal is received within a fourth preset time period after resetting; if not, triggering a second judging module 210, and if yes, triggering a third judging module 211;
the second determining module 210 is configured to determine that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault;
the third determining module 211 is configured to determine that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault.
Optionally, the first preset time length, the second preset time length, the third preset time length and the fourth preset time length are calibrated according to the following manner:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, and T4 respectively indicate the first preset time, the second preset time, the third preset time, and the fourth preset time, a indicates a preset maximum reset number, a indicates a duration of an instantaneous overcurrent fault, B indicates a duration of a short-time overcurrent fault, and C indicates a duration of a long-time overcurrent fault.
Optionally, the maximum number of times of resetting is greater than or equal to 3.
Optionally, the apparatus further comprises:
and the power-off module is used for controlling the vehicle-mounted DC/DC to be powered off when the third determination module 211 determines that the overcurrent fault of the current diagnosis period is a long overcurrent.
Optionally, the apparatus further comprises:
a sending module, configured to send instantaneous overcurrent fault information to an upper-layer system when the first determining module 203 determines that the overcurrent fault in the current diagnosis period is an instantaneous overcurrent fault; and/or when the second determination module 210 determines that the overcurrent fault of the current diagnosis period is a short-time overcurrent fault, sending short-time overcurrent fault information to an upper-layer system; and/or when the third determination module 211 determines that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault, sending long-term overcurrent fault information to an upper-layer system.
It is understood that at least some functions of one or more of the first resetting module 201, the first determining module 202, the first determining module 203, the second resetting module 204, the receiving module 205, the second determining module 206, the third resetting module 207, the fourth resetting module 208, the third determining module 209, the second determining module 210, the third determining module 211, the next module and the transmitting module (not shown) may be combined in one device, or any one of the modules may be split into a plurality of sub-modules, or the first resetting module 201, the first determining module 202, the first determining module 203, the second resetting module 204, the receiving module 205, the second determining module 206, the third resetting module 207, the fourth resetting module 208, the third determining module 209, the second determining module 210, the third determining module 211, the next module and the next module (not shown) may be combined with at least some functions of other modules, and is implemented in one functional module. According to the embodiment of the present invention, at least one of the first resetting module 201, the first determining module 202, the first determining module 203, the second resetting module 204, the receiving module 205, the second determining module 206, the third resetting module 207, the fourth resetting module 208, the third determining module 209, the second determining module 210, the third determining module 211, the lower module, and the transmitting module (not shown) may be at least partially implemented as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or may be implemented in hardware or firmware in any other reasonable manner of integrating or packaging a circuit, or implemented in a suitable combination of three manners of software, hardware, and firmware. Alternatively, at least one of the first resetting module 201, the first judging module 202, the first determining module 203, the second resetting module 204, the receiving module 205, the second judging module 206, the third resetting module 207, the fourth resetting module 208, the third judging module 209, the second determining module 210, the third judging module 211, the power-down module and the sending module (not shown) may be at least partially implemented as a computer program module, and when the program is executed by a computer, the function of the corresponding module may be executed.
Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the method for diagnosing an overcurrent of a vehicle-mounted DC/DC according to an embodiment of the present invention can be implemented.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device, such as but not limited to an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. The computer programs described herein may be downloaded to various computing/processing devices from a computer-readable storage medium, or to external computers or external storage devices over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives the computer program from the network and forwards the computer program for storage in a computer-readable storage medium in the respective computing/processing device. Computer programs for carrying out operations of the present invention may be assembly instructions, Instruction Set Architecture (ISA) instructions, machine related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer program may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), can execute computer-readable program instructions to implement various aspects of the present invention by utilizing state information of a computer program to personalize the electronic circuitry.
Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer-readable storage media according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer programs. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the programs, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a computer program may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable storage medium storing the computer program comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the computer program which executes on the computer, other programmable apparatus or other devices implements the functions/acts specified in the flowchart and/or block diagram block or blocks.
In conclusion, the technical scheme of the invention can effectively distinguish the instantaneous overcurrent fault, the short-time overcurrent fault and the long-time overcurrent fault, and then carry out power-off processing on the vehicle-mounted DC/DC based on the fault type, so that the power-off frequency of the vehicle-mounted DC/DC caused by load change can be effectively reduced, and the robustness of the vehicle-mounted DC/DC is improved; the technical scheme of the invention can be realized based on the existing overcurrent protection circuit, and a hardware circuit is not required to be changed, thereby avoiding the increase of the manufacturing cost; the four preset durations and the maximum resetting times in the technical scheme of the invention can be calibrated according to the whole vehicle working condition of vehicle-mounted DC/DC application, and the application range is wide.
It should be noted that, in the present specification, all the embodiments are described in a related manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus and computer-readable storage medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (11)
1. An overcurrent diagnosis method for vehicle-mounted DC/DC is characterized by being applied to a control unit in an overcurrent protection circuit of the vehicle-mounted DC/DC, and comprising the following steps:
resetting the latch unit after a first preset time length after receiving a first overcurrent fault signal aiming at any diagnosis period;
judging whether an overcurrent fault signal is received within a second preset time after the reset;
if not, judging that the overcurrent fault of the current diagnosis period is an instantaneous overcurrent fault;
if yes, resetting the latch unit after the first preset time length after receiving the overcurrent fault signal;
continuously receiving an overcurrent fault signal;
judging whether the reset times of the current diagnosis period reach the preset maximum reset times or not;
if not, resetting the latch unit after the first preset time after receiving the overcurrent fault signal, and returning to execute the step of continuously receiving the overcurrent fault signal;
if yes, resetting the latch unit after a third preset time after receiving the overcurrent fault signal;
judging whether an overcurrent fault signal is received within a fourth preset time after the reset;
if not, judging that the overcurrent fault of the current diagnosis period is a short-time overcurrent fault;
and if so, judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault.
2. The on-board DC/DC overcurrent diagnosis method according to claim 1, wherein the first preset time period, the second preset time period, the third preset time period, and the fourth preset time period are calibrated in the following manner:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, and T4 respectively indicate the first preset time, the second preset time, the third preset time, and the fourth preset time, a indicates a preset maximum reset number, a indicates a duration of an instantaneous overcurrent fault, B indicates a duration of a short-time overcurrent fault, and C indicates a duration of a long-time overcurrent fault.
3. The on-board DC/DC overcurrent diagnosis method according to claim 1, wherein the maximum number of resets is 3 or more.
4. The on-board DC/DC overcurrent diagnosis method according to claim 1, further comprising:
and when the overcurrent fault of the current diagnosis period is judged to be a long overcurrent, controlling the vehicle-mounted DC/DC to be powered off.
5. The on-board DC/DC overcurrent diagnosis method according to claim 1, further comprising:
when the overcurrent fault of the current diagnosis period is judged to be an instantaneous overcurrent fault, instantaneous overcurrent fault information is sent to an upper-layer system; and/or the presence of a gas in the gas,
when the overcurrent fault of the current diagnosis period is judged to be a short-time overcurrent fault, sending short-time overcurrent fault information to an upper-layer system; and/or the presence of a gas in the gas,
and when judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault, sending long-term overcurrent fault information to an upper-layer system.
6. The over-current diagnosis device of the vehicle-mounted DC/DC is characterized in that a control unit applied to an over-current protection circuit of the vehicle-mounted DC/DC comprises:
the first reset module is used for resetting the latch unit after a first preset time length after receiving a first overcurrent fault signal aiming at any diagnosis period;
the first judgment module is used for judging whether an overcurrent fault signal is received within a second preset time after the reset; if not, triggering the first judging module, and if so, triggering the second resetting module;
the first judging module is used for judging that the overcurrent fault of the current diagnosis period is an instantaneous overcurrent fault;
the second reset module is used for resetting the latch unit after receiving the first preset time length after receiving the overcurrent fault signal;
the receiving module is used for continuously receiving the overcurrent fault signal;
the second judgment module is used for judging whether the reset times of the current diagnosis period reach the preset maximum reset times or not; if not, triggering a third resetting module, and if so, triggering a fourth resetting module;
the third reset module is used for resetting the latch unit after receiving the first preset time after the overcurrent fault signal is received, and triggering the receiving module;
the fourth reset module is used for resetting the latch unit after receiving a third preset time length after receiving the overcurrent fault signal;
the third judgment module is used for judging whether an overcurrent fault signal is received within a fourth preset time after resetting; if not, triggering a second judging module, and if so, triggering a third judging module;
the second judging module is used for judging that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault;
and the third judging module is used for judging that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault.
7. The on-board DC/DC overcurrent diagnostic device according to claim 6, wherein the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration are calibrated in the following manner:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, and T4 respectively indicate the first preset time, the second preset time, the third preset time, and the fourth preset time, a indicates a preset maximum reset number, a indicates a duration of an instantaneous overcurrent fault, B indicates a duration of a short-time overcurrent fault, and C indicates a duration of a long-time overcurrent fault.
8. The on-board DC/DC overcurrent diagnosis device according to claim 6, wherein the maximum number of resets is 3 or more.
9. The on-board DC/DC overcurrent diagnosis apparatus according to claim 6, further comprising:
and the power-off module is used for controlling the vehicle-mounted DC/DC to be powered off when the third judging module judges that the overcurrent fault of the current diagnosis period is a long overcurrent.
10. The on-board DC/DC overcurrent diagnosis apparatus according to claim 6, further comprising:
the sending module is used for sending instantaneous overcurrent fault information to an upper-layer system when the first judging module judges that the overcurrent fault in the current diagnosis period is the instantaneous overcurrent fault; and/or when the second determination module determines that the overcurrent fault of the current diagnosis period is a short-time overcurrent fault, sending short-time overcurrent fault information to an upper-layer system; and/or when the third judging module judges that the overcurrent fault of the current diagnosis period is a long-term overcurrent fault, sending long-term overcurrent fault information to an upper-layer system.
11. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1-5.
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