CN115303074B - A fault diagnosis method and device for electric vehicle current stagnation - Google Patents
A fault diagnosis method and device for electric vehicle current stagnationInfo
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- CN115303074B CN115303074B CN202211121802.9A CN202211121802A CN115303074B CN 115303074 B CN115303074 B CN 115303074B CN 202211121802 A CN202211121802 A CN 202211121802A CN 115303074 B CN115303074 B CN 115303074B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a fault diagnosis method and device for current clamping stagnation of an electric vehicle. The fault diagnosis method includes determining a first expected current range according to a state parameter before and after a change and a battery current before the change when at least one state parameter of the electric vehicle is changed in a driving mode, wherein the state parameter includes at least one of a battery voltage, a vehicle speed and an opening degree of an accelerator pedal. And determining whether current clamping stagnation occurs according to the first expected current range and the changed battery current. If the number of times of current clamping stagnation in a single preset period reaches the preset number of times, determining that the electric vehicle has clamping stagnation faults. If the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and zeroing the number of times of current clamping. The scheme of the invention can reduce the data demand and the triggering judgment conditions and improve the accuracy of fault diagnosis.
Description
Technical Field
The embodiment of the invention relates to the technical field of automobile control, in particular to a fault diagnosis method and device for current clamping stagnation of an electric vehicle.
Background
In recent years, with the rapid development of energy storage technology, the electric automobile industry is attracting more and more attention, and the electric automobile industry is becoming a popular industry.
In a traditional vehicle-mounted system of an automobile, after the speed of the automobile is greater than a preset value, an opening signal of an accelerator pedal is obtained, and then the opening signal is compared with a historical opening signal under the same speed of the automobile, so that whether the accelerator pedal is stuck or not is judged.
However, the traditional jamming judgment method is harsh in triggering condition, large in data demand and low in accuracy, and is not suitable for being applied to electric automobiles with higher safety requirements.
Disclosure of Invention
The invention provides a fault diagnosis method and device for current clamping stagnation of an electric vehicle, which are used for reducing data demand and triggering judgment conditions and improving the accuracy of fault diagnosis.
In a first aspect, an embodiment of the present invention provides a fault diagnosis method for current clamping stagnation of an electric vehicle, where the fault diagnosis method for current clamping stagnation of an electric vehicle includes:
In a driving mode, when at least one state parameter of the electric vehicle changes, determining a first expected current range according to the state parameter before and after the change and the battery current before the change, wherein the state parameter comprises at least one of battery voltage, vehicle speed and opening degree of an accelerator pedal;
Determining whether a current clamping stagnation occurs according to the first expected current range and the changed battery current;
If the number of times of the current clamping stagnation in a single preset period reaches the preset number of times, determining that the electric vehicle has clamping stagnation faults;
If the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and zeroing the number of times of current clamping.
Optionally, in the driving mode, when at least one state parameter of the electric vehicle changes, before determining the first expected current range according to the state parameter before and after the change and the battery current before the change, the method further includes:
in a standby state, whether the current clamping stagnation occurs is judged according to the battery voltage and the battery current.
Optionally, after judging whether the current clamping stagnation occurs according to the battery voltage and the battery current, the method further includes:
entering different running modes of the electric vehicle according to at least one state parameter, wherein the running modes comprise a running mode and a charging mode;
In the charging mode, whether the current clamping stagnation occurs is judged according to the battery voltage and the battery current.
Optionally, determining whether the current clamping stagnation occurs according to the battery voltage and the battery current includes:
detecting the battery voltage and the battery current;
When the battery voltage changes in a pulse mode, judging whether the battery current changes with the battery voltage or not;
and if the battery current does not change along with the battery voltage, determining that the current clamping stagnation occurs.
Optionally, when the battery voltage changes in a pulse manner, determining whether the battery current changes with the battery voltage includes:
determining a second expected current range according to the battery voltage before and after the change and the battery current before the change under the condition that the change amount of the battery voltage in a preset period exceeds a preset voltage value;
If the changed battery current reaches the second expected current range, determining that the battery current changes along with the battery voltage;
And if the changed battery current does not reach the second expected current range, determining that the battery current does not change along with the battery voltage.
Optionally, after determining that the electric vehicle has a stuck fault and determining that the electric vehicle has no stuck fault, the method further includes:
judging whether the electric vehicle is out of operation or not;
If the electric vehicle is out of operation, ending the diagnosis method;
And if the electric vehicle does not exit the operation, returning to enter different operation modes of the electric vehicle according to at least one state parameter.
Optionally, in the driving mode, when at least one state parameter of the electric vehicle changes, determining the first expected current range according to the state parameter before and after the change and the battery current includes:
When the vehicle speed changes, determining a first change proportion according to the ratio of the vehicle speed before and after the change;
The first expected current range is determined from the first change ratio and the battery current before the change.
Optionally, in the driving mode, when at least one state parameter of the electric vehicle changes, determining the first expected current range according to the state parameter before and after the change and the battery current includes:
when the opening degree changes, determining a second change proportion according to the ratio of the opening degrees before and after the change;
The first expected current range is determined from the second ratio of variation and the battery current before variation.
Optionally, when the battery voltage is pulsed, determining a second expected current range according to the battery voltage before and after the change and the battery current before the change includes:
when the battery voltage changes in a pulse mode, determining a third change proportion according to the ratio of the battery voltages before and after the change;
The second expected current range is determined from the third ratio of variation and the battery current before variation.
In a second aspect, the embodiment of the invention also provides a fault diagnosis device for the current clamping stagnation of the electric vehicle, which comprises a first expected current range determination unit, a current clamping stagnation determination unit and a clamping stagnation fault judgment unit, wherein the first expected current range determination unit is used for determining a first expected current range according to the state parameters before and after the change and the battery current before the change when at least one state parameter of the electric vehicle changes in a driving mode, and the state parameters comprise the battery voltage, the vehicle speed and the opening degree of an accelerator pedal. The current clamping stagnation determining unit is used for determining whether current clamping stagnation occurs according to the first expected current range and the changed battery current. The stuck fault judging unit is used for determining that the electric vehicle has stuck faults if the number of times of current stuck in a single preset period reaches preset times, and determining that the electric vehicle does not have stuck faults and returning the number of times of current stuck to zero if the number of times of current stuck in the single preset period does not reach preset times.
According to the fault diagnosis method and device for the electric vehicle current clamping stagnation, in the driving process, the first expected current range is determined according to the state parameters before and after the change and the battery current before the change under the condition that the state parameters are changed, then whether the electric vehicle is subjected to the current clamping stagnation is determined according to the first expected current range and the battery current after the change, further, the clamping stagnation fault is determined when the current clamping stagnation times of a single preset period reach the preset times, the electric vehicle is subjected to the clamping stagnation fault is determined when the current clamping stagnation times of the single preset period do not reach the preset times, the current clamping stagnation times are determined to be free of the electric vehicle in the preset period, the judgment of the clamping stagnation fault in the driving mode of the electric vehicle is realized, each current clamping stagnation judgment in the process is determined according to the state parameters before and after the single change and the battery current, comparison is performed without a large amount of historical data, and the data demand is reduced. The judgment of the current clamping stagnation is implemented when the state parameter changes, the current clamping stagnation does not need to reach a certain speed or above, and the condition for triggering the judgment is low. The preset period and the preset times adopted in the process of judging the jamming faults reduce jamming false alarms caused by sensing signal errors and improve the accuracy of fault diagnosis.
Drawings
Fig. 1 is a schematic flow chart of a fault diagnosis method for current clamping stagnation of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a flow chart of another fault diagnosis method for current clamping stagnation of an electric vehicle according to an embodiment of the present invention;
Fig. 3 is a flow chart of another fault diagnosis method for current clamping stagnation of an electric vehicle according to an embodiment of the present invention;
Fig. 4 is a schematic flow chart of a method for determining a first expected current range in a driving mode according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for determining a first expected current range in a standby state or a charging mode according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a fault diagnosis device for current clamping stagnation of an electric vehicle according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In order to solve the problems in the background art, the embodiment of the invention provides a fault diagnosis method for current clamping stagnation of an electric vehicle. Fig. 1 is a flow chart of a fault diagnosis method for electric vehicle current clamping stagnation according to an embodiment of the present invention, and referring to fig. 1, the fault diagnosis method for electric vehicle current clamping stagnation includes:
S101, in a driving mode, when at least one state parameter of the electric vehicle changes, determining a first expected current range according to the state parameters before and after the change and the battery current before the change.
The state parameter is a parameter value that can reflect the state of the electric vehicle such as the running speed and the battery power supply efficiency. The state parameter includes at least one of a battery voltage, a vehicle speed, and an opening degree of an accelerator pedal. The driving mode refers to a mode corresponding to the electric vehicle in the process of traveling, and in the driving mode, the speed of the electric vehicle is not 0. The battery voltage refers to the voltage across the energy storage battery. The battery current refers to the supply current of the energy storage battery for other electric appliances in the electric vehicle or the charging current provided by the charger for the energy storage battery, and the electric appliances can comprise a power motor, an air conditioner, an indicator light and any other vehicle-mounted electric appliances. The first expected current range refers to a range of values of the expected output current of the energy storage battery as the state parameter changes.
Specifically, in the driving mode, the whole vehicle control system can acquire the speed of the electric vehicle through a speed sensor, and can also acquire the opening of an accelerator pedal through a position sensor. The whole vehicle control system is in communication connection with the battery management system, and can acquire battery state parameters such as voltage and state of charge value of the energy storage battery. The judgment of whether the state parameter is changed or not can be performed according to the relative relation between the change amount (or change speed) of the state parameter and the corresponding threshold value. The acquisition period of the state parameters can be set according to actual requirements, and can also be judged according to real-time state parameters. For example, if the amount of change in the real-time battery voltage is 3V within 5 seconds and exceeds the voltage threshold by 2V, the overall vehicle control system may determine that the battery voltage has changed. Under the condition that at least one state parameter of the electric vehicle is determined to be changed, the increasing amount of the state parameter can be determined according to the state parameters before and after the change. And then the first expected current range of the battery current after the change can be determined according to the increasing amount of the state parameter and the battery current before the change. The first expected current range refers to an expected range of battery current after a change in battery current due to a change in a state parameter. For example, in the driving mode, under the condition that other state parameters are unchanged, the speed of the electric vehicle is reduced from 50km/h to 40km/h due to road conditions, and then the first expected current range after the speed change can be determined according to the relative relation between the battery current obtained through the test and the speed. If the percentage of the decrease in the vehicle speed is equal to the percentage of the increase in the battery current with the other state variables unchanged, and the battery current is 10A at a vehicle speed of 50km/h, the first expected current range may include 10 x (1+1/5) =12a, and preferably the first expected range may be 11.5A-12.5A.
The electric vehicle is exemplified by stable running with a battery voltage of 18V, a vehicle speed of 50km/h, and an opening degree of an accelerator pedal of 30%, at which time the battery current is 10A. Then, since the road condition becomes downhill, the vehicle speed becomes 60km/h from 50 km/h. If the battery voltage is still 18V and the opening of the accelerator pedal is still 30%, the first expected current range may include 10×1-1/5=8a.
S102, determining whether current clamping stagnation occurs according to the first expected current range and the changed battery current.
Specifically, the relative relationship between the first expected current range and the changed battery current is compared, and then the difference between the first expected current range and the changed battery current is calculated. And whether the electric vehicle has current clamping stagnation or not can be judged according to the relative relation between the first expected current range and the changed battery current. For example, if the changed battery current is not within the first expected current range, it may be indicated that the battery current is not changed along with the change of the state parameter, and it may be further determined that the electric vehicle has current clamping stagnation. If the changed battery current is in the first expected current range, the battery current can be indicated to change along with the change of the state parameter, and then the electric vehicle can be determined to be normally running, and no current clamping stagnation occurs in the change process of the state parameter. The current clamping stagnation can not only reflect that the opening degree of the pedal when the pedal is pressed down is not corresponding to the signal output by the pedal, but also reflect that the signal output by the pedal has abnormal faults in the transmission process, and also reflect that the relative relation between the voltage and the current of the energy storage battery is abnormal, and also reflect that the transmission of the vehicle speed signal is abnormal, and various faults such as the abnormal faults.
For example, if the battery current before the primary speed change is 8A, the corresponding first expected current range after the change is 9.8A-10.2A, and the battery current after the actual change is 8.5A, and the battery current after the change is not in the first expected current range, it may be further determined that the electric vehicle has current clamping stagnation in the process of the current speed change. The number of current clamping cycles in a single preset period is increased by one.
S103, judging whether the preset period is up to the end of the preset period according to the time.
Specifically, after judging whether or not current clamping stagnation occurs each time, it is necessary to determine whether or not the preset period end is reached according to time. If the current clamping time reaches the end of the preset period, judging whether the current clamping time reaches the preset time or not in a single preset period. If the current clamping time does not reach the end of the preset period, the step S101 can be returned to continue to judge whether the current clamping occurs or not and accumulate the times of the current clamping in the preset period.
S104, judging whether the number of current clamping stagnation times in a single preset period reaches the preset number of times.
And S105, if the number of times of current clamping in a single preset period reaches the preset number of times, determining that the electric vehicle has clamping faults.
The preset period refers to a current clamping stagnation counting period for judging whether clamping stagnation faults occur or not, the preset times refer to a current clamping stagnation time threshold for judging whether the clamping stagnation faults occur or not in a single preset period, and the preset period and the preset times are related to the acquisition error rate of a sensing device for acquiring state parameters on the electric vehicle.
Specifically, in the process of collecting the state parameters, the sensing device on the electric vehicle is affected by the driving mode, the environment, the self structure and other factors, so that a sensing signal obtained and uploaded to the whole vehicle control system by the sensing device has a certain error rate. In order to avoid the false alarm of clamping stagnation caused by the error of the sensing signal, the application sets a preset period and preset times according to the experience value and the error rate experiment of the sensing signal. In a single preset period, the preset times are larger than the error times of the experimentally measured sensing signals, and the error of the sensing signals is prevented from causing clamping stagnation false alarm. In a single preset period, if the number of times of current clamping is greater than or equal to the preset number of times, the fault of the clamping of the electric vehicle can be determined due to the error of the current clamping non-sensing signal.
And S106, if the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and returning the number of times of current clamping to zero.
Specifically, in a single preset period, if the number of times of current clamping is not up to the preset number of times, the current clamping in the preset period can be determined to be caused by sensing signal errors, and then it can be determined that the electric vehicle has no clamping fault in the preset period. Illustratively, the preset period may be 10 seconds and the preset number of times may be 2 times. If the number of times of current clamping stagnation of the electric vehicle in a single preset period does not reach the preset number of times, the number of times of current clamping stagnation can be cleared, and the judgment of the next preset period is entered.
According to the fault diagnosis method for the electric vehicle current clamping stagnation, in the running process, under the condition that the state parameters are changed, the first expected current range is determined according to the state parameters before and after the change and the battery current before the change, whether the electric vehicle is subjected to the current clamping stagnation or not is determined according to the first expected current range and the battery current after the change, further, the number of times of the current clamping stagnation in a single preset period reaches the preset number of times, the electric vehicle is determined to be subjected to the clamping stagnation fault, the number of times of the current clamping stagnation in the single preset period does not reach the preset number of times, the electric vehicle is determined to be free of the clamping stagnation fault in the preset period, the judgment of the clamping stagnation fault in the running mode of the electric vehicle is achieved, each current clamping stagnation judgment in the running process is determined according to the state parameters before and after the single change and the battery current, a large amount of historical data is not needed for comparison, and the data demand is reduced. The judgment of the current clamping stagnation is implemented when the state parameter changes, the current clamping stagnation does not need to reach a certain speed or above, and the condition for triggering the judgment is low. The preset period and the preset times adopted in the process of judging the jamming faults reduce jamming false alarms caused by sensing signal errors and improve the accuracy of fault diagnosis.
Optionally, fig. 2 is a schematic flow chart of another fault diagnosis method for electric vehicle current clamping stagnation according to an embodiment of the present invention, and referring to fig. 2, on the basis of the foregoing embodiment, the fault diagnosis method for electric vehicle current clamping stagnation may further include:
S201, in a standby state or a charging mode, judging whether current clamping stagnation occurs according to the battery voltage and the battery current.
The standby state is a standby state after the electric vehicle is powered on, and in the standby state, the vehicle speed of the electric vehicle is 0 and the energy storage battery is not charged. The charging mode refers to a mode in which the electric vehicle is connected to the charging device, in which state the vehicle speed of the energy storage battery is 0 and the battery voltage is equal to the charging voltage.
Specifically, in the case where the electric vehicle is in a standby state or a charging mode, the battery voltage and the battery current are acquired. In the case of a pulse change in the battery voltage, it is determined whether the battery current changes with the battery voltage, where the pulse change refers to an excessive voltage change in a short time, and for example, the pulse change may be that the amount of change in the battery voltage exceeds a preset voltage value in a preset period, the preset period may be 1 second, and the preset voltage value may be 10V. If the battery current varies with the battery voltage, no clamping stagnation occurs in the battery current. If the battery current does not change with the battery voltage, the battery current becomes stuck.
For example, when the electric vehicle is in a standby state, if the user connects the electric vehicle to the charging device, the total voltage across the energy storage battery of the electric vehicle may be pulsed. S201, in a standby state or a charging mode, judging whether current clamping stagnation occurs according to the battery voltage and the battery current may include S2011, detecting whether the battery voltage of the electric vehicle has pulse change in the standby state. S2012, when the battery voltage changes in a pulse mode, judging whether the battery current changes along with the battery voltage. And S2013, if the battery current does not change along with the battery voltage, determining that current clamping stagnation occurs. S2014, if the battery current changes along with the battery voltage, determining that no current clamping stagnation occurs. Preferably, when the battery voltage is pulsed, the second expected current range is determined from the battery voltage before and after the change and the battery current before the change. If the variation of the battery current reaches the second expected current range, the battery current is determined to vary with the battery voltage. If the variation of the battery current does not reach the second expected current range, the battery current is determined to be unchanged along with the battery voltage, and then the current clamping stagnation is determined to occur. The relationship between the battery voltage before and after the change and the battery current after the change can be measured according to experiments, so that the relationship can be used for determining the second expected current range.
S202, judging whether the preset period is up to the end of the preset period according to the time.
Specifically, after judging whether or not current clamping stagnation occurs each time, it is necessary to determine whether or not the preset period end is reached according to time. If the current clamping time reaches the end of the preset period, judging whether the current clamping time reaches the preset time or not in a single preset period. If the current clamping time does not reach the end of the preset period, the step S201 can be returned to continue to judge whether the current clamping occurs and accumulate the times of the current clamping in the preset period.
S203, judging whether the number of current clamping stagnation times in a single preset period reaches the preset number of times
S204, if the number of times of current clamping in a single preset period reaches the preset number of times, determining that the electric vehicle has clamping faults.
S205, if the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and returning the number of times of current clamping to zero.
Steps S203, S204 and S205 are the same as the one-to-one correspondence of steps S104, S105 and S106, and will not be described here.
According to the flow chart of the fault diagnosis method for the electric vehicle current clamping stagnation, provided by the embodiment, under the condition that the electric vehicle is in a standby state or a charging mode, whether the electric vehicle current clamping stagnation occurs or not is judged according to the battery voltage and the battery current, and under the condition that the number of times of the electric vehicle current clamping stagnation reaches the preset number of times in a single preset period, the fault of the electric vehicle clamping stagnation is determined. And if the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and returning the number of times of current clamping to zero, entering a next preset period, judging whether current clamping occurs according to the battery voltage and the battery current, judging whether the electric vehicle has clamping faults in a standby state and a charging mode, determining each time of current clamping judgment in the process according to the battery voltage and the battery current before and after single change, and comparing without a large amount of historical data, thereby reducing the data demand. The judgment of the current clamping stagnation is implemented when the state parameter changes, the current clamping stagnation does not need to reach a certain speed or above, and the condition for triggering the judgment is low. The preset period and the preset times adopted in the process of judging the jamming faults reduce jamming false alarms caused by sensing signal errors and improve the accuracy of fault diagnosis.
Optionally, fig. 3 is a flow chart of another fault diagnosis method for current clamping stagnation of an electric vehicle according to an embodiment of the present invention, and referring to fig. 3, the fault diagnosis method for current clamping stagnation of an electric vehicle based on the foregoing embodiment includes:
S301, in a standby state, judging whether current clamping stagnation occurs according to the battery voltage and the battery current.
The standby state is a standby state after the electric vehicle is powered on, and in the standby state, the vehicle speed of the electric vehicle is 0 and the energy storage battery is not charged.
Specifically, in the case where the electric vehicle is in a standby state, the battery voltage and the battery current are acquired. In the case of a pulse change in the battery voltage, it is determined whether the battery current changes with the battery voltage, where the pulse change refers to an excessive voltage change in a short time, and for example, the pulse change may be that the amount of change in the battery voltage exceeds a preset voltage value in a preset period, the preset period may be 1 second, and the preset voltage value may be 10V. If the battery current varies with the battery voltage, no clamping stagnation occurs in the battery current. If the battery current does not change with the battery voltage, the battery current becomes stuck.
For example, when the electric vehicle is in a standby state, if the user connects the electric vehicle to the charging device, the total voltage across the energy storage battery of the electric vehicle may be pulsed. S301, in a standby state, judging whether current clamping stagnation occurs according to battery voltage and battery current can comprise detecting whether pulse change occurs to the battery voltage of the electric vehicle in the standby state. When the battery voltage changes in a pulse mode, whether the battery current changes along with the battery voltage is judged. If the battery current changes along with the battery voltage, the current clamping stagnation is determined. If the battery current does not change along with the battery voltage, determining that no current clamping stagnation occurs. Preferably, when the battery voltage is pulsed, the second expected current range is determined from the battery voltage before and after the change and the battery current before the change. If the variation of the battery current reaches the second expected current range, the battery current is determined to vary with the battery voltage. If the variation of the battery current does not reach the second expected current range, the battery current is determined to be unchanged along with the battery voltage, and then the current clamping stagnation is determined to occur. The relationship between the battery voltage before and after the change and the battery current after the change can be measured according to experiments, so that the relationship can be used for determining the second expected current range.
S302, entering different running modes of the electric vehicle according to at least one state parameter.
The running modes comprise a driving mode and a charging mode.
Specifically, the state parameters of the electric vehicle include a gear state, a battery voltage, a vehicle speed, and an opening degree of an accelerator pedal. For example, it may be determined that the electric vehicle enters the drive mode when it is detected that the vehicle speed is not equal to 0 or the shift state is not neutral. When it is detected that the battery voltage increases to a preset voltage value (the preset voltage value may be equal to the charging voltage provided by the charging post), it may be determined that the electric vehicle enters the charging mode. If the driving mode or the charging mode is not entered, the process may return to step S301 to repeatedly determine whether the electric vehicle is in the standby state and whether current clamping occurs (only the case of entering the driving mode or the charging mode from the standby state is shown in fig. 3).
S303, in a charging mode, judging whether current clamping stagnation occurs according to the battery voltage and the battery current.
Specifically, similar to the standby state, in the charging mode, it is necessary to acquire the battery voltage and the battery current. In the case of a pulse change in the battery voltage, it is determined whether the battery current changes with the battery voltage, where the pulse change refers to an excessive voltage change in a short time, and for example, the pulse change may be that the amount of change in the battery voltage exceeds a preset voltage value in a preset period, the preset period may be 1 second, and the preset voltage value may be 10V. If the battery current varies with the battery voltage, no clamping stagnation occurs in the battery current. If the battery current does not change with the battery voltage, the battery current becomes stuck.
For example, when the electric vehicle is in the charging mode, the user disconnects the electric vehicle from the charging device, which may cause a pulse change in the total voltage across the energy storage battery of the electric vehicle. S303, in a charging mode, judging whether current clamping stagnation occurs according to the battery voltage and the battery current can comprise S3031, in the charging mode, detecting whether pulse change occurs to the battery voltage of the electric vehicle. S3032, when the battery voltage changes in a pulse mode, whether the battery current changes along with the battery voltage is judged. S3033, if the battery current does not change along with the battery voltage, determining that current clamping stagnation occurs. S3034, if the battery current changes along with the battery voltage, determining that no current clamping stagnation occurs. Preferably, when the battery voltage is pulsed, the second expected current range is determined from the battery voltage before and after the change and the battery current before the change. And if the changed battery current reaches the second expected current range, determining that the battery current changes along with the battery voltage. If the changed battery current does not reach the second expected current range, the battery current is determined to be unchanged along with the battery voltage, and then the current clamping stagnation is determined to occur. The relationship between the battery voltage before and after the change and the battery current after the change can be measured according to experiments, so that the relationship can be used for determining the second expected current range.
S304, in the driving mode, when at least one state parameter changes, a first expected current range is determined according to the state parameter before and after the change and the battery current before the change.
S305, determining whether current clamping stagnation occurs according to the first expected current range and the changed battery current.
S306, judging whether the preset period is up to the end of the preset period according to the time.
S307, judging whether the number of current clamping stagnation times in a single preset period reaches preset times.
And S308, if the number of times of current clamping in a single preset period reaches the preset number of times, determining that the electric vehicle has clamping faults.
S309, if the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and returning the number of times of current clamping to zero.
The steps S304, S305, S306, S307, S308 and S309 are the same as the steps S101, S102, S103, S104, S105 and S106, respectively, and are not described herein.
According to the fault diagnosis method for the electric vehicle current clamping stagnation, provided by the embodiment, under the condition that the electric vehicle is in the standby state or the charging state, whether the current clamping stagnation occurs is judged according to whether the battery current changes along with the pulse change of the battery voltage, and the electric vehicle is determined to have clamping stagnation faults when the current clamping stagnation in a preset period reaches the preset times, so that the fault diagnosis can be finished in advance in the non-running process of the electric vehicle, a user is reminded to conduct investigation, safety problems caused by the current clamping stagnation in the running process are prevented, the safety of the electric vehicle is improved, the current clamping stagnation diagnosis covers all running modes of the electric vehicle, and the coverage area of the fault diagnosis is improved.
Optionally, with continued reference to fig. 3, in S309, if the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle has not failed in clamping and returning the number of times of current clamping to zero may further include determining whether the electric vehicle is out of operation. And if the electric vehicle is out of operation, ending the diagnosis method. And if the electric vehicle does not exit the operation, returning to enter different operation modes of the electric vehicle according to at least one state parameter.
Specifically, at the end of each preset period, that is, after the electric vehicle is determined to have a jamming fault or not, whether the electric vehicle is out of operation can be judged, the judging standard can comprise whether a shutdown signal is received, the shutdown signal refers to a signal triggered by the reverse rotation of a key of the electric vehicle, and the whole vehicle control system can be controlled to stop working. If the shutdown signal is received, the electric vehicle can be determined to be about to exit from running, and if the shutdown signal is not received, the electric vehicle is determined to be still in normal running (standby state, driving mode or charging mode). If the electric vehicle does not exit the operation, returning to the step S302, entering different operation modes of the electric vehicle again according to at least one state parameter, and performing current clamping stagnation counting of a new preset period.
Optionally, fig. 4 is a schematic flow chart of a method for determining a first expected current range in a driving mode according to an embodiment of the present invention, and referring to fig. 4, based on the foregoing embodiment, in the driving mode, a method for determining the first expected current range according to a state parameter before and after a change and a battery current includes:
s401, in a driving mode, whether the vehicle speed changes is judged.
S402, when the vehicle speed changes, determining a first change proportion according to the ratio of the vehicle speeds before and after the change.
Specifically, in the driving mode, when it is determined that the vehicle speed changes, the vehicle speed before and after the change may be compared to obtain the first change ratio. The first change proportion may represent a degree of change in the vehicle speed. By way of example, the vehicle speed before the change is 50km/h and the vehicle speed after the change is 60km/h, the first change ratio may be 5/6.
S403, determining a first expected current range according to the first change proportion and the battery current before change.
Specifically, the first change ratio is related to the degree of change in the battery current, so the first expected current range can be calculated from the first change ratio and the battery current before the speed change. For example, if the battery current before the vehicle speed is changed, 6A, and the first change ratio of the vehicle speed is 5/6, under the condition that other state parameters are unchanged, 5a can be obtained by multiplying 6A by 5/6, 5a is in the first expected current range, and 4.8A-5.2A can be determined to be the first expected current range according to experimental results or empirical values.
S404, in the driving mode, whether the opening degree of the accelerator pedal is changed is judged.
Specifically, in the running mode, the battery current in the normal state may vary with the opening degree of the accelerator pedal. It is possible to determine whether or not current clamping occurs when the opening degree of the accelerator pedal is changed.
S405, when the opening degree changes, determining a second change proportion according to the ratio of the opening degrees before and after the change.
Specifically, in the running mode, when it is determined that the opening degree of the accelerator pedal is changed, the opening degrees before and after the change may be compared to obtain the second change ratio. The second variation ratio may represent a degree of variation in the opening degree of the accelerator pedal. For example, the second variation ratio may be 10/13, with the opening degree of the accelerator pedal before the variation being 50% (the depression depth being 50% of the total depth), and the opening degree of the accelerator pedal after the variation being 65%.
S406, determining a first expected current range according to the second change proportion and the battery current before change.
Specifically, the second variation ratio is correlated with the degree of variation in the battery current, so the first expected current range can be calculated from the second variation ratio and the battery current before the depth of the accelerator pedal is changed. For example, if the battery current before the opening degree of the accelerator pedal is changed is 6A, the second change ratio of the opening degree of the accelerator pedal is 6/5, and the other state parameters are unchanged, the battery current is obtained by dividing 6A by 6/5 to obtain 5a,5a is in the first expected current range, and 4.8A-5.2A can be determined as the first expected current range according to experimental results or experience values.
According to the fault diagnosis method for the electric vehicle current clamping stagnation, in the driving mode, the first expected current range is determined according to the transformation ratio of the vehicle speed to the opening degree of the accelerator pedal and the battery current before the change, and whether the current clamping stagnation occurs or not is further determined according to the relation between the actual battery current after the change and the first expected current range, so that the judgment of the electric vehicle current clamping stagnation in the driving process is realized, the fault determination of the clamping stagnation is further completed, the data used by the method is less, a large amount of historical data do not need to be recorded for comparison, and the simplicity of the fault diagnosis method is improved.
Optionally, fig. 5 is a schematic flow chart of a method for determining a first expected current range in a standby state or a charging mode according to an embodiment of the present invention, referring to fig. 5, in the standby state or the charging mode, when a battery voltage is pulsed, a second expected current range is determined according to the battery voltage before and after the change and the battery current before the change, which includes:
s501, in the standby state or the charging mode, it is determined whether the battery voltage has changed in pulses.
Specifically, in the standby state or the charging mode, the battery current may vary with the pulse variation of the battery voltage in the normal state. It is possible to judge whether or not current clamping occurs when the battery voltage is pulsed.
S502, when the battery voltage changes in a pulse mode, determining a third change proportion according to the ratio of the battery voltages before and after the change.
Specifically, in the standby state or the charging mode, when it is determined that the battery voltage is pulsed, the battery voltage before and after the variation may be compared to obtain the third variation ratio. The third variation ratio may represent a degree of variation in the battery voltage. Illustratively, the battery voltage before the change is 200V, and the battery voltage after the change becomes 380V, the third change ratio may be 10/19.
S503, determining a second expected current range according to the third change proportion and the battery current before change.
Specifically, the third variation ratio is correlated with the degree of variation in the battery current, so the second expected current range can be calculated from the third variation ratio and the battery current before the battery voltage is varied. For example, if the battery current before the battery voltage pulse changes is 10A, the third change ratio of the battery voltage is 10/19, and the other state parameters are unchanged, the battery current may be divided by 10A and 10/19 to obtain 19a,19a in the second expected current range, and 18A-20A may be determined to be the second expected current range according to experimental results or empirical values. In addition, the vehicle control system may further directly determine a second expected current range according to the type of the connected charging pile, and for example, when the charging pile is a constant current charging pile, the second expected current range may be a charging current range of the constant current charging pile.
According to the fault diagnosis method for the electric vehicle current clamping stagnation, the electric vehicle can be subjected to clamping stagnation fault diagnosis by utilizing corresponding state parameters in different modes or states, current clamping stagnation judgment is performed in response to the change of the vehicle speed or the opening degree of the accelerator pedal in the driving mode, a first expected current range is determined according to the vehicle speed before and after the change or the opening degree of the accelerator pedal and the battery current before the change, and then whether current clamping stagnation occurs is determined according to the first expected current range and the battery current after the change. And then determining whether current clamping stagnation occurs according to the second expected current range and the battery current after the change, so that the current clamping stagnation judgment and counting of the electric car in each mode and state are realized, the fault diagnosis accuracy is improved, and the safety of the electric car is comprehensively improved.
The embodiment of the invention also provides a fault diagnosis device for the current clamping stagnation of the electric vehicle. Fig. 6 is a schematic structural diagram of a fault diagnosis device for electric vehicle current clamping stagnation according to an embodiment of the present invention, and referring to fig. 6, a fault diagnosis device 600 for electric vehicle current clamping stagnation includes a first expected current range determining unit 601, a current clamping stagnation determining unit 602, and a clamping stagnation fault judging unit 603, where the first expected current range determining unit 601 is configured to determine, in a driving mode, a first expected current range according to a state parameter before and after a change and a battery current before the change when at least one state parameter changes, where the state parameter includes at least one of a battery voltage, a vehicle speed, and an opening degree of an accelerator pedal. The current clamping stagnation determining unit 602 is configured to determine whether current clamping stagnation occurs according to the first expected current range and the changed battery current. The stuck fault judging unit 603 is configured to determine that the electric vehicle has a stuck fault if the number of times of current stuck in a single preset period reaches a preset number of times, and determine that the electric vehicle has no stuck fault and zero the number of times of current stuck if the number of times of current stuck in the single preset period does not reach the preset number of times.
Optionally, on the basis of the embodiment, the fault diagnosis device for the electric vehicle current clamping stagnation further comprises a mode determination module, wherein the mode determination module is used for entering different operation modes of the electric vehicle according to at least one state parameter, and the operation modes comprise a driving mode and a charging mode. The current clamping stagnation determining unit is also used for judging whether current clamping stagnation occurs according to the battery voltage and the battery current in the standby state and judging whether current clamping stagnation occurs according to the battery voltage and the battery current in the charging mode.
According to the fault diagnosis method and device for the electric vehicle current clamping stagnation, in the driving process, the first expected current range is determined according to the state parameters before and after the change and the battery current before the change under the condition that the state parameters are changed, then whether the electric vehicle is subjected to the current clamping stagnation is determined according to the first expected current range and the battery current after the change, further, the clamping stagnation fault is determined when the current clamping stagnation times of a single preset period reach the preset times, the electric vehicle is subjected to the clamping stagnation fault is determined when the current clamping stagnation times of the single preset period do not reach the preset times, the electric vehicle is not subjected to the clamping stagnation fault in the preset period, the current clamping stagnation times are cleared, the judgment on the clamping stagnation fault of the electric vehicle is realized, each current clamping stagnation judgment in the process is determined according to the state parameters before and after the single change and the battery current, a large amount of historical data is not needed for comparison, and the data demand is reduced. The judgment of the current clamping stagnation is implemented when the state parameter changes, the current clamping stagnation does not need to reach a certain speed or above, and the condition for triggering the judgment is low. The preset period and the preset times adopted in the process of judging the jamming faults reduce jamming false alarms caused by sensing signal errors and improve the accuracy of fault diagnosis. The product can execute the method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. The fault diagnosis method for the current clamping stagnation of the electric vehicle is characterized by comprising the following steps of:
Entering different running modes of the electric vehicle according to at least one state parameter, wherein the running modes comprise a running mode and a charging mode, and the state parameter comprises at least one of battery voltage, vehicle speed and opening degree of an accelerator pedal;
In the charging mode, judging whether the current clamping stagnation occurs according to the battery voltage and the battery current, specifically comprising detecting the battery voltage and the battery current, judging whether the battery current changes along with the battery voltage when the battery voltage changes in a pulse mode, and determining that the current clamping stagnation occurs if the battery current does not change along with the battery voltage;
In the driving mode, when at least one state parameter of the electric vehicle changes, determining a first expected current range according to the state parameters before and after the change and the battery current before the change;
Determining whether a current clamping stagnation occurs according to the first expected current range and the changed battery current;
If the number of times of the current clamping stagnation in a single preset period reaches the preset number of times, determining that the electric vehicle has clamping stagnation faults;
If the number of times of current clamping in a single preset period does not reach the preset number of times, determining that the electric vehicle does not have clamping faults and zeroing the number of times of current clamping.
2. The fault diagnosis method for electric vehicle current clamping stagnation of claim 1, further comprising, prior to entering different operation modes of the electric vehicle according to at least one state parameter:
in the standby state, whether current clamping stagnation occurs is judged according to the battery voltage and the battery current.
3. The fault diagnosis method of electric vehicle current clamping stagnation according to claim 1, wherein determining whether the battery current changes with the battery voltage when the battery voltage changes in pulses, comprises:
determining a second expected current range according to the battery voltage before and after the change and the battery current before the change under the condition that the change amount of the battery voltage in a preset period exceeds a preset voltage value;
If the changed battery current reaches the second expected current range, determining that the battery current changes along with the battery voltage;
And if the changed battery current does not reach the second expected current range, determining that the battery current does not change along with the battery voltage.
4. The fault diagnosis method of electric vehicle current stuck according to claim 1, further comprising, after determining that the electric vehicle has stuck fault and determining that the electric vehicle has not stuck fault:
judging whether the electric vehicle is out of operation or not;
If the electric vehicle is out of operation, ending the diagnosis method;
And if the electric vehicle does not exit the operation, returning to enter different operation modes of the electric vehicle according to at least one state parameter.
5. The method for diagnosing a fault in an electric vehicle as recited in claim 1, wherein when at least one state parameter of the electric vehicle is changed in the driving mode, determining the first expected current range according to the state parameter before and after the change and the battery current includes:
When the vehicle speed changes, determining a first change proportion according to the ratio of the vehicle speed before and after the change;
The first expected current range is determined from the first change ratio and the battery current before the change.
6. The method for diagnosing a fault in an electric vehicle as recited in claim 1, wherein when at least one state parameter of the electric vehicle is changed in the driving mode, determining the first expected current range according to the state parameter before and after the change and the battery current includes:
When the opening of the accelerator pedal changes, determining a second change proportion according to the ratio of the opening of the accelerator pedal before and after the change;
The first expected current range is determined from the second ratio of variation and the battery current before variation.
7. The fault diagnosis method of electric vehicle current clamping stagnation of claim 3, wherein when said battery voltage is pulsed, determining a second expected current range from said battery voltage before and after the change and said battery current before the change comprises:
when the battery voltage changes in a pulse mode, determining a third change proportion according to the ratio of the battery voltages before and after the change;
The second expected current range is determined from the third ratio of variation and the battery current before variation.
8. A fault diagnosis device for current clamping stagnation of an electric vehicle, comprising:
A first expected current range determining unit configured to determine a first expected current range according to a state parameter before and after a change and a battery current before the change when at least one state parameter of the electric vehicle changes in a driving mode, wherein the state parameters include a battery voltage, a vehicle speed, and an opening degree of an accelerator pedal;
A current clamping stagnation determining unit, configured to determine whether a current clamping stagnation occurs according to the first expected current range and the changed battery current;
the clamping stagnation fault judging unit is used for determining that the electric vehicle has clamping stagnation faults if the number of times of current clamping stagnation in a single preset period reaches preset times, and determining that the electric vehicle does not have clamping stagnation faults and returning the number of times of current clamping stagnation to zero if the number of times of current clamping stagnation in the single preset period does not reach preset times;
The current clamping stagnation determining unit is further used for entering different running modes of the electric vehicle according to at least one state parameter, wherein the running modes comprise a running mode and a charging mode, the state parameter comprises at least one of battery voltage, vehicle speed and opening of an accelerator pedal, in the charging mode, whether the current clamping stagnation occurs or not is judged according to the battery voltage and the battery current, specifically, the current clamping stagnation determining unit is used for detecting the battery voltage and the battery current, when the battery voltage changes in a pulse mode, judging whether the battery current changes along with the battery voltage or not, and if the battery current does not change along with the battery voltage, determining that the current clamping stagnation occurs.
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