CN112670957B - Vehicle-mounted DC/DC overcurrent diagnosis method, device and computer readable storage medium - Google Patents
Vehicle-mounted DC/DC overcurrent diagnosis method, device and computer readable storage medium Download PDFInfo
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Abstract
The invention provides an overcurrent diagnosis method and device for a vehicle-mounted DC/DC, which are characterized in that after receiving an overcurrent fault signal, a control unit resets a latch unit in different time intervals according to the characteristics of different overcurrent fault types, and identifies the overcurrent fault type through reset time and reset times on the basis of the existing overcurrent protection circuit. The scheme provided by the invention can effectively distinguish the types of overcurrent faults under the condition of not changing a hardware circuit, reduces the frequency of power-down of the vehicle-mounted DC/DC caused by load change, and improves the robustness of the vehicle-mounted DC/DC.
Description
Technical Field
The present invention relates to the field of vehicle-mounted power supply technologies, and in particular, to a vehicle-mounted DC/DC overcurrent diagnosis method, apparatus, and computer readable storage medium.
Background
For the vehicle-mounted DC/DC, because the application working condition is complex, the vehicle-mounted DC/DC can often generate overcurrent, so that in order to protect 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 down. The following describes a 48V vehicle DC/DC and an overcurrent protection circuit thereof, taking the vehicle 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 12V loads, and fig. 1 is a voltage network commonly used in the 48V system, including a 48V voltage network and a 12V voltage network, wherein the 12V voltage network of the whole vehicle comprises a low-voltage storage battery, the 12V loads, a starter (optional) and the like.
In practical application, the application working conditions of the vehicle-mounted DC/DC are complex, and the following three working conditions exist: 1. the 12V load comprises a plurality of electric devices, the load condition can frequently generate severe change, so that a short-time peak appears in the 12V voltage network current, the type of overcurrent fault caused by the working condition is instantaneous overcurrent, and the 12V load is characterized in that the overcurrent duration time A is instantaneous; 2. the vehicle-mounted DC/DC short-time overcurrent 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 short-time overcurrent, and the vehicle-mounted DC/DC overcurrent is characterized in that the overcurrent duration time B is shorter, and when the load is recovered to be normal, the overcurrent fault also disappears; 3. the load is short-circuited, so that the vehicle-mounted DC/DC is over-flowed for a long time, and the type of over-current fault caused by the working condition is long-time over-current, and the over-current fault is characterized in that the over-current duration time C is very long, and unless a short-circuit loop is disconnected, the over-current phenomenon is continuous all the time.
Fig. 2 is a schematic diagram of an overcurrent protection circuit of a 48V vehicle 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 DC/DC, at this time, a fault determining unit sets an overcurrent protection signal ocp_enb high, thereby closing the DC/DC power unit, achieving a safe state, and at the same time, a latch unit latches the overcurrent fault signal ocp_enb and sends the overcurrent fault signal to a control unit, and the control unit powers down the vehicle DC/DC. When the control unit receives a power-up command of an upper layer system such as VCU, the control unit issues a Reset instruction to the latch to clear the overcurrent fault signal ocp_enb in the latch unit, so that the vehicle-mounted DC/DC is powered up and is operated again.
In the prior art, as the control unit cannot correctly distinguish the type of the overcurrent fault caused by the overcurrent working condition, once the vehicle-mounted DC/DC has the overcurrent fault, the control unit can power down the vehicle-mounted DC/DC, so that the vehicle-mounted DC/DC is frequently powered up and down due to load change, and the robustness of the vehicle-mounted DC/DC is poor.
Disclosure of Invention
The invention aims to provide an overcurrent diagnosis method, an overcurrent diagnosis device and a computer readable storage medium for vehicle-mounted DC/DC, so as to effectively distinguish types of overcurrent faults, reduce the frequency of power-down 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 a vehicle-mounted DC/DC overcurrent diagnosis method, which is applied to a control unit in an overcurrent protection circuit of the vehicle-mounted DC/DC, and the method includes:
for any diagnosis period, resetting the latch unit after receiving a first preset duration after receiving a first overcurrent fault signal;
judging whether an overcurrent fault signal is received within a second preset time period after reset;
if not, judging that the overcurrent fault in the current diagnosis period is an instantaneous overcurrent fault;
if yes, resetting the latch unit after receiving the first preset time length after 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 length after receiving the overcurrent fault signal, and returning to execute the step of continuously receiving the overcurrent fault signal;
if so, resetting the latch unit after receiving a third preset time length after the overcurrent fault signal;
judging whether an overcurrent fault signal is received within a fourth preset time period after reset;
if not, judging that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault;
if so, the overcurrent fault in the current diagnosis period is judged to be a long-time overcurrent fault.
Optionally, the first preset duration, the second preset duration, the third preset duration and the fourth preset duration are calibrated according to the following modes:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, T4 respectively represent the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, a represents a preset maximum resetting number of times, a represents a duration of an instantaneous overcurrent fault, B represents a duration of a short-time overcurrent fault, and C represents a duration of a long-time overcurrent fault.
Optionally, the maximum reset frequency is greater than or equal to 3.
Optionally, the method further comprises:
and controlling the vehicle-mounted DC/DC to be powered down when the overcurrent fault of the current diagnosis period is judged to be long-term overcurrent.
Optionally, the method further comprises:
when the overcurrent fault in the current diagnosis period is judged to be the instantaneous overcurrent fault, transmitting instantaneous overcurrent fault information to the upper layer system; and/or the number of the groups of groups,
when the overcurrent fault in the current diagnosis period is judged to be a short-time overcurrent fault, sending short-time overcurrent fault information to the upper layer system; and/or the number of the groups of groups,
and when the overcurrent fault of the current diagnosis period is judged to be the long-time overcurrent fault, sending the long-time overcurrent fault information to the upper layer system.
Based on the same inventive concept, the invention also provides an overcurrent diagnosis device of the vehicle-mounted DC/DC, which is applied to a control unit in an overcurrent protection circuit of the vehicle-mounted DC/DC, and comprises:
the first resetting module is used for resetting the latch unit after receiving a first preset duration after receiving a first overcurrent fault signal for any diagnosis period;
the first judging module is used for judging whether an overcurrent fault signal is received within a second preset time period after reset; if not, triggering a first judging module, and if so, triggering a second resetting module;
the first judging module is used for judging that the overcurrent fault in the current diagnosis period is an instantaneous overcurrent fault;
the second resetting module is configured to reset the latch unit after receiving the first preset duration after the overcurrent fault signal;
the receiving module is used for continuously receiving the overcurrent fault signal;
the second judging 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 resetting module is configured to reset the latch unit after receiving the first preset duration after the overcurrent fault signal, and trigger the receiving module;
the fourth resetting module is configured to reset the latch unit after receiving a third preset duration after the overcurrent fault signal;
the third judging module is used for judging whether an overcurrent fault signal is received in a fourth preset time period after reset; 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 in the current diagnosis period is a long-time overcurrent fault.
Optionally, the first preset duration, the second preset duration, the third preset duration and the fourth preset duration are calibrated according to the following modes:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, T4 respectively represent the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, a represents a preset maximum resetting number of times, a represents a duration of an instantaneous overcurrent fault, B represents a duration of a short-time overcurrent fault, and C represents a duration of a long-time overcurrent fault.
Optionally, the maximum reset frequency is greater than or equal to 3.
Optionally, the apparatus further includes:
and the power-down module is used for controlling the vehicle-mounted DC/DC to power down when the third judging module judges that the overcurrent fault of the current diagnosis period is long-time overcurrent.
Optionally, the apparatus further includes:
the sending module is used for sending the instantaneous overcurrent fault information to the 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 judging module judges that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault, sending short-time overcurrent fault information to the upper layer system; and/or when the third judging module judges that the overcurrent fault of the current diagnosis period is a long-time overcurrent fault, sending long-time overcurrent fault information to the upper layer system.
Based on the same inventive concept, the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program can realize the vehicle-mounted DC/DC overcurrent diagnosis method when being executed by a processor.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the technical scheme, the instantaneous overcurrent faults, the short-time overcurrent faults and the long-time overcurrent faults can be effectively distinguished, and then the vehicle-mounted DC/DC is subjected to power-down treatment based on the fault type, so that the power-down 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, so that the increase of manufacturing cost is avoided;
3. the four preset time lengths and the maximum resetting times in the technical scheme of the invention can be calibrated according to the working condition of the whole vehicle of the vehicle-mounted DC/DC application, and the application range is wide.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a 48V system voltage network;
FIG. 2 is a schematic diagram of an on-board DC/DC over-current protection circuit;
FIG. 3 is a schematic flow chart of an over-current diagnosis method for a vehicle DC/DC according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an on-vehicle DC/DC overcurrent diagnosis device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings, for the purpose of making the objects and features of the present invention more understandable, however, the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Furthermore, it is noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which 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, implementation by software, and implementation by a combination of software and hardware are all equivalent.
In order to solve the problem that the type of the overcurrent fault cannot be distinguished in the prior art, so that the frequency of power-down 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.
The following first describes an overcurrent diagnosis method for a vehicle-mounted DC/DC according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of an overcurrent 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, can also be other types of high-voltage DC/DC, and can be applied to vehicles such as pure electric vehicles, fuel cell vehicles, hybrid electric vehicles and the like.
The overcurrent diagnosis method can be applied to a control unit in an overcurrent protection circuit of the vehicle-mounted DC/DC. Taking the overcurrent protection circuit of the 48V vehicle DC/DC as an example shown in fig. 2, the overcurrent protection circuit of the vehicle DC/DC may further include a fault judging 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 sets the overcurrent protection signal sent to the latching unit high so as to close the DC/DC power unit, and meanwhile, the latching unit latches the overcurrent fault signal sent to the control unit, namely, sends the overcurrent fault signal 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 in the current period can be determined according to the overcurrent diagnosis method of the vehicle-mounted DC/DC shown in fig. 3. The diagnostic cycle can be understood as: for each overcurrent fault, a diagnosis period is defined from the time when the first overcurrent fault signal is received to the time when the type of the overcurrent fault is diagnosed.
Specifically, referring to fig. 3, an over-current diagnosis method for vehicle DC/DC may include the following steps:
step S101, resetting the 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 latch unit fault, so that the DC/DC power unit is restarted, and the vehicle-mounted DC/DC is recovered to work normally;
step S102, judging whether an overcurrent fault signal is received within a second preset time period after reset; if not, executing step S103; if yes, go to step S104;
step S103, judging that the overcurrent fault in the current diagnosis period is an instantaneous overcurrent fault;
step S104, resetting the latch unit after receiving the first preset time length after 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; if not, execute step S107; if yes, go to step S108;
step S107, resetting the latch unit after the first preset time period after receiving the overcurrent fault signal, and returning to execute step S105 to continue receiving the overcurrent fault signal;
step S108, resetting the latch unit after receiving a third preset time length after the overcurrent fault signal;
step S109, judging whether an overcurrent fault signal is received within a fourth preset time period after reset; if not, executing step S110; if yes, go to step S111;
step S110, judging that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault;
step S111, it is determined that the overcurrent fault in the current diagnosis period is a long-term overcurrent fault.
It should be noted that, the overcurrent diagnosis method provided in this embodiment relates to four preset durations, that is, a first preset duration T1, a second preset duration T2, a third preset duration T3, and a fourth preset duration T4. The inventors found through research analysis that the overcurrent faults caused by load variation are classified into three types: transient over-current faults, short-time over-current faults, and long-time over-current faults, wherein the duration of the transient over-current faults is smaller than the duration of the short-time over-current faults, and the duration of the long-time over-current faults is longest.
Since the durations of the overcurrent faults of different types are different, the core idea of the invention is to distinguish the types of the overcurrent faults based on the durations of the overcurrent faults. Therefore, the invention calibrates the four preset durations according to the duration of three types of overcurrent faults, and specifically, the relationship between the four preset durations and the duration of 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, T4 respectively represent the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, a represents a preset maximum resetting number of times, a represents a duration of an instantaneous overcurrent fault, B represents a duration of a short-time overcurrent fault, and C represents a duration of a long-time overcurrent fault.
In this embodiment, the preset maximum number of resets is 3 or more. In practical application, the four preset durations and the maximum resetting times can be calibrated according to the working condition of the whole vehicle of the vehicle-mounted DC/DC application.
For steps S101-S103, the control unit resets the latch unit after receiving the first preset duration after receiving the first overcurrent fault signal, and determines whether the overcurrent fault signal is received within the second preset duration after the reset. Since the first preset time period is longer than the duration of the transient over-current fault, if the current over-current fault is of the type of transient over-current, the current over-current fault is eliminated at the moment of resetting the latch unit, and therefore the control unit will not receive a new over-current fault signal within the second preset time period after the reset.
Therefore, if step S102 determines that the overcurrent fault signal is not received within the second preset time period after the reset, it may be determined that the current type of the overcurrent fault is an instantaneous overcurrent fault, and this diagnosis period ends. Otherwise, if step S102 determines that the new overcurrent fault signal is received within the second preset time period after the reset, it indicates that the current type of the overcurrent fault is not an instantaneous overcurrent fault, and it needs to further determine whether the current type of the overcurrent fault is a short-time overcurrent fault or a long-time overcurrent fault.
If step S102 determines 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 restarted, and the vehicle-mounted DC/DC works normally again. Whether the short-time or long-time overcurrent fault occurs, step S104 resets the latch unit so that the vehicle-mounted DC/DC will still be overcurrent after the vehicle-mounted DC/DC is operated normally again, and therefore, the control unit will continue 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 number of the current diagnostic period reaches the preset maximum reset number. If the maximum reset times are not reached, the overcurrent fault signals are continuously monitored until the reset times reach the maximum reset times.
Since the product of the sum of the first preset time period and the second preset time period and the maximum number of resets is set to be smaller than the duration of the short-time overcurrent fault (i.e., (t1+t2) x a < B), and the product of the sum of the first preset time period and the second preset time period and the maximum number of resets is further summed with the third preset time period to be longer than the duration of the short-time overcurrent fault (i.e., (t1+t2) x a+t3 > B), if the current overcurrent fault type is assumed to be short-time overcurrent, when the overcurrent fault signal is received and the number of resets reaches the maximum number of resets, the latch unit is reset after the third preset time period after the overcurrent fault signal is received, the short-time overcurrent fault is eliminated at the reset time point, and then step S109 is executed to determine whether the overcurrent fault signal is received in the fourth preset time period after the reset, if the current overcurrent fault type is not received, the current overcurrent fault type can be determined to be short-time overcurrent fault type.
If the current type of overcurrent fault is assumed to be long-term overcurrent, the overcurrent will last for a longer time, so the embodiment sets (t1+t2) ×a+t3+t4 < C, then after the control unit resets the latch unit after receiving the overcurrent fault signal in step S108, the control unit still receives the overcurrent fault signal in a fourth preset time after the reset, so when step S109 is executed to determine that the overcurrent fault signal is received in the fourth preset time after the reset, it can be determined that the current type of overcurrent fault is long-term overcurrent.
It can be seen that, in this embodiment, in each diagnosis period, the control unit responds to the overcurrent fault signal by the above method, so that the instantaneous overcurrent fault, the short-time overcurrent fault and the long-time overcurrent fault can be effectively distinguished. Because the duration of the instantaneous overcurrent fault and the short-time overcurrent fault is relatively short, 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 can be not required to be powered down, and only when the overcurrent fault type in the current diagnosis period is judged to be long-time overcurrent, the control unit controls the vehicle-mounted DC/DC to be powered down, so that the frequency of the power down of the vehicle-mounted DC/DC caused by load change can be effectively reduced, and the robustness of the vehicle-mounted DC/DC is further improved.
Further, the method for diagnosing the overcurrent of the vehicle-mounted DC/DC provided in the embodiment may further include:
when the overcurrent fault in the current diagnosis period is judged to be the instantaneous overcurrent fault, transmitting instantaneous overcurrent fault information to the upper layer system; and/or the number of the groups of groups,
when the overcurrent fault in the current diagnosis period is judged to be a short-time overcurrent fault, sending short-time overcurrent fault information to the upper layer system; and/or the number of the groups of groups,
and when the overcurrent fault of the current diagnosis period is judged to be the long-time overcurrent fault, sending the long-time overcurrent fault information to the upper layer system.
The upper system may be a component for controlling power-on of the vehicle-mounted DC/DC in the electric vehicle, for example, a core component VCU (Vehicle Control Unit, electric vehicle controller) of the whole vehicle control system of the electric vehicle. And after judging the type of the overcurrent fault, sending corresponding overcurrent fault information to the 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 performs statistical analysis on the fault information and performs calibration on four preset time lengths and the maximum reset times according to an analysis result.
Based on the same inventive concept, an embodiment of the invention also provides an overcurrent diagnosis device of the vehicle-mounted DC/DC, which is applied to a control unit in an overcurrent protection circuit of the vehicle-mounted DC/DC. Referring to fig. 2, fig. 2 is a schematic structural diagram of an on-vehicle DC/DC overcurrent diagnosis device according to an embodiment of the invention, where the on-vehicle DC/DC overcurrent diagnosis device may include: the first resetting module 201, the first judging module 202, the first judging 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 judging module 210, and the third judging module 211.
A first resetting module 201, configured to reset the latch unit after receiving a first preset duration after receiving a first overcurrent fault signal for any one diagnostic period;
a first judging module 202, configured to judge whether an overcurrent fault signal is received within a second preset duration after the reset; if not, triggering the first decision module 203, and if so, triggering the second reset 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 duration after the overcurrent fault signal;
a receiving module 205, configured to continue receiving the overcurrent fault signal;
a second judging module 206, configured to judge whether the reset times of the current diagnostic period reach a preset maximum reset times; if not, triggering a third reset module 207, 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 duration after the overcurrent fault signal, and trigger the receiving module 205;
the fourth resetting module 208 is configured to reset the latch unit after receiving a third preset duration after the overcurrent fault signal;
a third judging module 209, configured to judge whether an overcurrent fault signal is received within a fourth preset duration after the reset; if not, the second decision block 210 is triggered, and if so, the third decision block 211 is triggered;
the second determining module 210 is configured to determine that the overcurrent fault in the current diagnostic period is a short-time overcurrent fault;
the third determining module 211 is configured to determine that the overcurrent fault in the current diagnostic period is a long-term overcurrent fault.
Optionally, the first preset duration, the second preset duration, the third preset duration and the fourth preset duration are calibrated according to the following modes:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, T4 respectively represent the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, a represents a preset maximum resetting number of times, a represents a duration of an instantaneous overcurrent fault, B represents a duration of a short-time overcurrent fault, and C represents a duration of a long-time overcurrent fault.
Optionally, the maximum reset frequency is greater than or equal to 3.
Optionally, the apparatus further includes:
and the power-down module is used for controlling the vehicle-mounted DC/DC to power down when the third judging module 211 judges that the overcurrent fault of the current diagnosis period is long overcurrent.
Optionally, the apparatus further includes:
a sending module, configured to send instantaneous overcurrent fault information to the upper layer system when the first determining module 203 determines that the overcurrent fault in the current diagnostic period is an instantaneous overcurrent fault; and/or, when the second determination module 210 determines that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault, sending short-time overcurrent fault information to the 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 the upper layer system.
It is understood that at least part of the functions of one or more of the first reset module 201, the first reset module 202, the first reset module 203, the second reset module 204, the receiving module 205, the second reset module 206, the third reset module 207, the fourth reset module 208, the third reset module 209, the second reset module 210, the third reset module 211, and the power down module, and the transmitting module (not shown) may be combined in one apparatus, or any one of the modules may be split into a plurality of sub-modules, or at least part of the functions of one or more of the first reset module 201, the first reset module 202, the first reset module 203, the second reset module 204, the receiving module 205, the second reset module 206, the third reset module 207, the fourth reset module 208, the third reset module 209, the second reset module 210, the third reset module 211, and the power down module, and the transmitting module (not shown) may be combined with at least part of the functions of other modules and implemented in one functional module. According to embodiments of the present invention, at least one of the first reset module 201, the first reset module 202, the first reset module 203, the second reset module 204, the receiving module 205, the second reset module 206, the third reset module 207, the fourth reset module 208, the third reset module 209, the second reset module 210, the third reset module 211, and the power down module, the transmitting module (not shown) may be implemented at least in part as hardware circuitry, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or any other reasonable manner of integrating or packaging the circuitry, or any other suitable combination of three implementations of software, hardware, and firmware. Alternatively, at least one of the first reset module 201, the first determination module 202, the first determination module 203, the second reset module 204, the receiving module 205, the second determination module 206, the third reset module 207, the fourth reset module 208, the third determination module 209, the second determination module 210, the third determination module 211, and the power-down module, the transmitting module (not shown) may be at least partially implemented as a computer program module, which may perform the functions of the corresponding module when the program is run by a computer.
Based on the same inventive concept, an embodiment of the present invention further provides a computer readable storage medium, where a computer program is stored in the computer readable storage medium, and when the computer program is executed by a processor, the method for diagnosing an overcurrent of a vehicle 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 storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage 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: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer program described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device via 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 transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface 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 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 kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present invention are implemented by personalizing electronic circuitry, such as programmable logic circuits, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information for a computer program, which can execute computer-readable program instructions.
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, when executed by 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. These computer programs 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 includes 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 is executed 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 summary, the technical scheme of the invention can effectively distinguish the instantaneous overcurrent fault, the short-time overcurrent fault and the long-time overcurrent fault, so that the vehicle-mounted DC/DC is powered down based on the fault type, the power down 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, so that the increase of manufacturing cost is avoided; the four preset time lengths and the maximum resetting times in the technical scheme of the invention can be calibrated according to the working condition of the whole vehicle of the vehicle-mounted DC/DC application, and the application range is wide.
It should be noted that, in the present specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. In particular, for apparatus, computer readable storage medium embodiments, the description is relatively simple, as it is substantially similar to method embodiments, with reference to the section of the method embodiments being relevant.
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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (9)
1. An overcurrent diagnosis method for a vehicle-mounted DC/DC, characterized by being applied to a control unit in an overcurrent protection circuit for the vehicle-mounted DC/DC, the method comprising:
for any diagnosis period, resetting the latch unit after receiving a first preset duration after receiving a first overcurrent fault signal;
judging whether an overcurrent fault signal is received within a second preset time period after reset;
if not, judging that the overcurrent fault in the current diagnosis period is an instantaneous overcurrent fault;
if yes, resetting the latch unit after receiving the first preset time length after 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 length after receiving the overcurrent fault signal, and returning to execute the step of continuously receiving the overcurrent fault signal;
if so, resetting the latch unit after receiving a third preset time length after the overcurrent fault signal;
judging whether an overcurrent fault signal is received within a fourth preset time period after reset;
if not, judging that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault;
if yes, judging that the overcurrent fault in the current diagnosis period is a long-time overcurrent fault;
the first preset time period, the second preset time period, the third preset time period and the fourth preset time period are calibrated according to the following modes:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, T4 respectively represent the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, a represents a preset maximum resetting number of times, a represents a duration of an instantaneous overcurrent fault, B represents a duration of a short-time overcurrent fault, and C represents a duration of a long-time overcurrent fault.
2. The method for diagnosing an overcurrent in a vehicle DC/DC system according to claim 1, wherein the maximum number of resets is 3 or more.
3. The on-vehicle DC/DC overcurrent diagnostic method of claim 1, further comprising:
and controlling the vehicle-mounted DC/DC to be powered down when the overcurrent fault of the current diagnosis period is judged to be long-term overcurrent.
4. The on-vehicle DC/DC overcurrent diagnostic method of claim 1, further comprising:
when the overcurrent fault in the current diagnosis period is judged to be the instantaneous overcurrent fault, transmitting instantaneous overcurrent fault information to the upper layer system; and/or the number of the groups of groups,
when the overcurrent fault in the current diagnosis period is judged to be a short-time overcurrent fault, sending short-time overcurrent fault information to the upper layer system; and/or the number of the groups of groups,
and when the overcurrent fault of the current diagnosis period is judged to be the long-time overcurrent fault, sending the long-time overcurrent fault information to the upper layer system.
5. An overcurrent diagnosis device of an in-vehicle DC/DC, characterized by a control unit applied to an overcurrent protection circuit of the in-vehicle DC/DC, comprising:
the first resetting module is used for resetting the latch unit after receiving a first preset duration after receiving a first overcurrent fault signal for any diagnosis period;
the first judging module is used for judging whether an overcurrent fault signal is received within a second preset time period after reset; if not, triggering a first judging module, and if so, triggering a second resetting module;
the first judging module is used for judging that the overcurrent fault in the current diagnosis period is an instantaneous overcurrent fault;
the second resetting module is configured to reset the latch unit after receiving the first preset duration after the overcurrent fault signal;
the receiving module is used for continuously receiving the overcurrent fault signal;
the second judging 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 resetting module is configured to reset the latch unit after receiving the first preset duration after the overcurrent fault signal, and trigger the receiving module;
the fourth resetting module is configured to reset the latch unit after receiving a third preset duration after the overcurrent fault signal;
the third judging module is used for judging whether an overcurrent fault signal is received in a fourth preset time period after reset; 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;
the third judging module is used for judging that the overcurrent fault in the current diagnosis period is a long-time overcurrent fault;
the first preset time period, the second preset time period, the third preset time period and the fourth preset time period are calibrated according to the following modes:
T1＞A；
(T1+T2)×a＜B；
(T1+T2)×a+T3＞B；
(T1+T2)×a+T3+T4＜C；
wherein T1, T2, T3, T4 respectively represent the first preset duration, the second preset duration, the third preset duration, and the fourth preset duration, a represents a preset maximum resetting number of times, a represents a duration of an instantaneous overcurrent fault, B represents a duration of a short-time overcurrent fault, and C represents a duration of a long-time overcurrent fault.
6. The on-vehicle DC/DC overcurrent diagnostic apparatus according to claim 5, wherein the maximum number of resets is 3 or more.
7. The on-vehicle DC/DC overcurrent diagnostic apparatus of claim 5, further comprising:
and the power-down module is used for controlling the vehicle-mounted DC/DC to power down when the third judging module judges that the overcurrent fault of the current diagnosis period is long-time overcurrent.
8. The on-vehicle DC/DC overcurrent diagnostic apparatus of claim 5, further comprising:
the sending module is used for sending the instantaneous overcurrent fault information to the 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 judging module judges that the overcurrent fault in the current diagnosis period is a short-time overcurrent fault, sending short-time overcurrent fault information to the upper layer system; and/or when the third judging module judges that the overcurrent fault of the current diagnosis period is a long-time overcurrent fault, sending long-time overcurrent fault information to the upper layer system.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program which, when executed by a processor, implements the method steps of any of claims 1-4.
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| CN113183779B (en) * | 2021-04-22 | 2023-07-28 | 联合汽车电子有限公司 | Vehicle-mounted charger and charging method thereof |
| CN113295919B (en) * | 2021-05-11 | 2024-04-16 | 联合汽车电子有限公司 | Signal detection circuit, DC/DC converter, detection method, and storage medium |
| CN114167970A (en) * | 2021-12-09 | 2022-03-11 | 深圳市海浦蒙特科技有限公司 | Overcurrent protection method and related assembly |
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