CN114720154A - Component failure detection system of vehicle electric drive system and power exchange station - Google Patents

Component failure detection system of vehicle electric drive system and power exchange station Download PDF

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Publication number
CN114720154A
CN114720154A CN202210432092.5A CN202210432092A CN114720154A CN 114720154 A CN114720154 A CN 114720154A CN 202210432092 A CN202210432092 A CN 202210432092A CN 114720154 A CN114720154 A CN 114720154A
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China
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vehicle
signal
electric drive
drive system
component failure
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CN202210432092.5A
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Chinese (zh)
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袁仪
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Weilai Power Technology Hefei Co Ltd
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Weilai Power Technology Hefei Co Ltd
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Priority to CN202210432092.5A priority Critical patent/CN114720154A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/80—Exchanging energy storage elements, e.g. removable batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Abstract

The invention relates to the technical field of vehicle detection, and particularly provides a component failure detection system of a vehicle electric drive system and a power exchange station, aiming at solving the problem of performing failure detection on the electric drive system reliably at low cost. The component failure detection system comprises a signal acquisition device and a signal analysis device, wherein the signal acquisition device of the component failure detection system is arranged in a suspended area at the bottom of a vehicle and can acquire sound signals in the process that an electric drive system operates according to a preset working condition, and the signal analysis device can analyze the sound signals so as to determine whether mechanical components of the electric drive system of the vehicle fail. By the method, an additional component monitoring system is not required to be arranged for each vehicle to carry out component failure detection on the electric drive system, and the component failure detection can be carried out on the vehicle as long as the vehicle is in a suspension state, such as when the vehicle is suspended when the power is exchanged, so that whether component failure occurs or not can be detected in time.

Description

Component failure detection system of vehicle electric drive system and power exchanging station
Technical Field
The invention relates to the technical field of vehicle detection, and particularly provides a component failure detection system of a vehicle electric drive system and a power exchanging station.
Background
Whether an electric drive system is reliably operated in a vehicle using electric energy as a power source such as an electric automobile greatly affects the running safety of the vehicle. The electric drive system mainly comprises an electric component and a mechanical component, wherein the electric component comprises a controller, an inverter and the like, and the mechanical component comprises a bearing, a gear and the like. At present, the failure detection of mechanical components of an electric drive system is mainly performed in the following three ways, so as to improve the reliability of the electric drive system. The first is to use mechanical components of high reliability, but this approach can add significant cost to the electric drive system; the second way is to make redundant configuration of mechanical parts, which not only increases the cost of the electric drive system, but also increases the system complexity of the electric drive system; the third mode is to add a component monitoring system in the vehicle, and to monitor the failure of the mechanical component by the component monitoring system, and to add an additional monitoring system in the vehicle, not only the design/manufacturing cost of the vehicle is increased, but also the operation pressure of the vehicle machine in the vehicle is increased, which affects the operation reliability of the vehicle machine.
Accordingly, there is a need in the art for a new solution to the above-described problems associated with the failure detection of mechanical components of an electric drive system.
Disclosure of Invention
In order to overcome the above drawbacks, the present invention is proposed to provide a component failure detection system and a power swapping station for a vehicle electric drive system that solve or at least partially solve the technical problem of how to cost-effectively and reliably detect a failure of a mechanical component of the vehicle electric drive system.
In a first aspect, the present invention provides a component failure detection system for a vehicle electric drive system, the component failure detection system comprising signal acquisition means and signal analysis means;
the signal acquisition device is arranged in a suspended area at the bottom of the vehicle after the vehicle is suspended, and is configured to acquire sound signals in the process that the electric drive system of the vehicle operates according to a preset working condition;
the signal analysis device is configured to perform signal analysis on the sound signal collected by the signal collection device to determine whether a failure occurs in a mechanical component of the vehicle electric drive system.
In one aspect of the above component failure detection system for a vehicle electric drive system, the signal acquisition device includes a movable device body and an acoustic sensor array disposed on the device body;
and/or the component failure detection system is deployed in a battery replacement station, the battery replacement station comprises a suspension mechanism, and the suspension mechanism can enable the vehicle to be suspended so as to conveniently replace a power battery of the vehicle.
In one aspect of the above component failure detection system for a vehicle electric drive system, the signal analysis device includes a sound source localization module and a signal analysis module;
the sound source localization module is configured to perform sound source localization according to the sound signal to determine a mechanical component generating the sound signal;
the signal analysis module is configured to perform signal analysis on the acoustic signal to determine whether a failure of a mechanical component that generates the acoustic signal has occurred.
In one embodiment of the system for detecting component failure of an electric drive system of a vehicle, the signal analysis module includes a first signal analysis submodule configured to perform spectrum analysis on sound signals generated by different mechanical components, respectively, and determine whether there is a spectrum characteristic when a mechanical component fails according to a result of the spectrum analysis; if the failure judgment result is positive, judging that the corresponding mechanical part fails; and if not, judging that the corresponding mechanical part does not fail.
In one embodiment of the system for detecting component failure of an electric drive system of a vehicle, the signal analysis module further includes a second signal analysis submodule, where the second signal analysis submodule is configured to perform component failure analysis on sound signals generated by different mechanical components through a fault identification model, and determine whether there is a frequency spectrum characteristic when the mechanical component fails according to a result of the component failure analysis;
the fault recognition model is obtained by performing fault classification training on a preset network model through a machine learning algorithm and using a training sample, wherein the training sample comprises signal characteristics of a sound signal generated when the mechanical component fails and signal characteristics of a sound signal generated when the mechanical component does not fail.
In one technical solution of the component failure detection system of the vehicle electric drive system, the device body is further provided with a signal processing circuit and a communication circuit, the signal processing circuit is configured to denoise the sound signal collected by the acoustic sensor array, package the denoised sound signal according to a preset communication protocol, and send the packaged sound signal to the signal analysis device through the communication circuit.
In one embodiment of the above component failure detection system for a vehicle electric drive system, a suspended area at the bottom of a vehicle after the vehicle is suspended in the air is divided into a high-intensity sound signal area and a low-intensity sound signal area according to a vehicle type of the vehicle, and the signal acquisition device is disposed in the high-intensity sound signal area.
In one embodiment of the system for detecting component failure of the vehicle electric drive system, the system for detecting component failure further includes a vehicle-mounted control device disposed on the vehicle, and the vehicle-mounted control device is configured to control a preset vehicle-mounted system capable of generating noise to stop operating according to a received detection instruction when the vehicle is detected to be suspended and the power battery is not replaced, so as to control the vehicle electric drive system to operate according to a preset working condition, so that the signal acquisition device acquires a sound signal in the process that the vehicle electric drive system operates according to the preset working condition.
In an embodiment of the system for detecting component failure of the vehicle electric drive system, the vehicle-mounted control device is further configured to, after receiving the detection instruction, perform an alarm and not control the vehicle electric drive system to operate according to a preset operating condition if it is detected that the vehicle is not suspended and/or the preset vehicle-mounted system that generates noise does not stop operating.
In a second aspect, a power exchanging station is provided, which includes a suspension mechanism capable of suspending a vehicle so as to replace a power battery of the vehicle, and the power exchanging station further includes a component failure detection device of a vehicle electric drive system according to any one of the above technical solutions.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
in the technical scheme of the invention, the component failure detection system can collect and analyze the sound signal generated when the electric drive system operates in no-load operation, and judge whether the mechanical component of the vehicle electric drive system fails according to the analysis result. In order to collect and analyze sound signals generated when the electric drive system operates in no-load mode, a signal collecting device in the component failure detection system can be arranged in a suspended area at the bottom of a vehicle after the vehicle is suspended, the signal collecting device is controlled to collect the sound signals in the process that the electric drive system of the vehicle operates according to preset working conditions, and the collected sound signals are sent to a signal analyzing device. The signal analysis device can perform signal analysis on the sound signals collected by the signal collection device to determine whether mechanical parts of the vehicle electric drive system fail. By the method, an additional component monitoring system is not required to be arranged for each vehicle to carry out component failure detection on the electric drive system, and the component failure detection can be carried out on the vehicle as long as the vehicle is in a suspension state, such as when the vehicle is suspended when the power is exchanged, so that whether component failure occurs or not can be detected in time.
Further, in one technical solution for implementing the present invention, the component failure detection system of the vehicle electric drive system is disposed in the battery replacement station, and a suspension mechanism is usually disposed in the battery replacement station, and the suspension mechanism can suspend the vehicle in the air, so as to facilitate power battery replacement of the vehicle. When a vehicle has a power change requirement (a power battery with insufficient electric quantity in the vehicle is replaced by a power battery with sufficient electric quantity), a component failure detection can be carried out on the electric drive system in the power change station. By the method, an additional component monitoring system is not required to be arranged for each vehicle to detect component failure of the electric drive system, so that the design/manufacturing cost of the vehicle is not increased, the calculation pressure of the vehicle machine is not increased, and the running reliability of the vehicle machine is reduced. In addition, because the power replacement requirement of the vehicle usually has certain periodicity, such as once power battery replacement every week, if the component failure detection is carried out on the electric drive system every time the vehicle enters the power replacement station for power replacement, the periodic detection on the electric drive system is realized, and even if high-reliability system components are not configured or redundant configuration is carried out on the electric drive system, whether the component failure occurs in the electric drive system can be detected in time through continuous component failure detection, so that safety measures can be adopted when the component failure occurs, and the safety of the vehicle is ensured.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Wherein:
FIG. 1 is a schematic diagram of the principal structure of a component failure detection system for a vehicle electric drive system in accordance with one embodiment of the present invention;
fig. 2 is a main structural schematic diagram of a signal acquisition apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic view of sound source localization according to one embodiment of the present invention;
FIG. 4 is a schematic view of sound source localization according to another embodiment of the present invention;
fig. 5 is a schematic view of sound source localization according to yet another embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, "module" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. Those skilled in the art will appreciate that the various modules in the system of the present invention may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention. The term "A and/or B" denotes all possible combinations of A and B, such as only A, only B or both A and B.
The following explains terms related to the present invention.
The vehicle electric drive system refers to an electric drive system suitable for a vehicle using electric energy as a power source, wherein the vehicle using electric energy as a power source may be a pure electric vehicle, or may be a hybrid vehicle using electric energy and other energy sources such as gasoline as power sources.
The power changing station is an energy station for changing a power battery of the vehicle. The power exchanging station in the embodiment of the invention can comprise a suspension mechanism, a battery loading and unloading mechanism and the like. The suspension mechanism can suspend the vehicle so as to replace the power battery of the vehicle, and the battery loading and unloading mechanism can move to the bottom of the vehicle to disassemble or install the power battery when the vehicle is suspended. In one embodiment, the battery replacement station may be the battery replacement station disclosed in patent application with application publication No. CN111251936A, wherein a lifting mechanism in the battery replacement station can lift or lower the vehicle, and the vehicle can be suspended by lifting the vehicle, so as to facilitate power battery replacement of the vehicle.
Referring to fig. 1, fig. 1 is a schematic block diagram of a component failure detection system for a vehicle electric drive system in accordance with an embodiment of the present invention. As shown in fig. 1, the component failure detection system of the vehicle electric drive system in the embodiment of the present invention mainly includes a signal acquisition device and a signal analysis device, which are specifically described below.
Signal acquisition device
The signal acquisition device can acquire the sound signals generated when the vehicle electric drive system operates in no-load mode, so that the signal analysis device can analyze the sound signals and judge whether mechanical parts of the vehicle electric drive system fail or not.
In the embodiment of the invention, the vehicle electric drive system can be controlled to operate according to the preset working condition when the vehicle is suspended, and meanwhile, the signal acquisition device is arranged in the suspended area at the bottom of the vehicle after the vehicle is suspended to acquire the sound signal generated in the operation process of the vehicle electric drive system.
In one embodiment, the component failure detection system may be deployed in a battery replacement station that includes a suspension mechanism that enables a vehicle to be suspended for power battery replacement of the vehicle. When the vehicle is subjected to power exchange, the vehicle is suspended, then the power exchange mechanism is moved to the bottom of the vehicle to exchange a power battery of the vehicle, and if the vehicle is suspended, the vehicle electric drive system is subjected to operation control, and then the vehicle electric drive system can be subjected to no-load operation control. For example, when a vehicle enters a battery replacement station for battery replacement, a component failure detection system may be used to detect component failure of a vehicle electric drive system after the vehicle is suspended by a suspension mechanism and before the battery replacement is started, and then the power battery of the vehicle may be replaced after the component failure detection is completed. In addition, the component failure detection system can be used for detecting the component failure of the vehicle electric driving system before the vehicle is suspended and not landed after the battery replacement is finished, and the vehicle is controlled to land after the component failure detection is finished.
Further, the positions of the vehicle electric drive systems of different vehicle types on the vehicle may be slightly different, and if the signal acquisition devices are placed in the same suspension area for all vehicle types, for some vehicle types, the sound signals generated during the operation of the vehicle electric drive systems may not be accurately acquired. Therefore, in one embodiment, a suspension area after the vehicle is suspended in the air can be divided into a high-intensity sound signal area and a low-intensity sound signal area according to the vehicle type of the vehicle, and the signal acquisition device is arranged in the high-intensity sound signal area when the component failure detection is carried out, so that the sound signals generated in the running process of the vehicle electric drive system can be accurately acquired, and the noise interference is reduced. In this embodiment, the sound intensity detection device may be used to detect the sound intensity of the suspended area after the suspension of the vehicles of different vehicle types, and then divide the suspended area according to the result of the sound intensity detection. For example, a high intensity sound signal region is defined if the sound intensity is greater than a preset intensity threshold, and a low intensity sound signal region is defined otherwise. A person skilled in the art may flexibly set a specific value of the intensity threshold according to actual requirements, which is not specifically limited in the embodiment of the present invention.
Further, in an embodiment according to the embodiment of the present invention, the component failure detection system may further include an on-board control device disposed on the vehicle, and in this embodiment, the on-board control device may be configured to control a preset on-board system that generates noise to stop operating according to a received detection instruction when the vehicle is detected to be suspended and the power battery is not replaced, so as to control the vehicle electric drive system to operate according to a preset operating condition, so that the signal acquisition device performs sound signal acquisition during the operation of the vehicle electric drive system according to the preset operating condition.
The preset vehicle-mounted systems which can generate noise can be vehicle-mounted systems determined through experimental tests, and after determining which vehicle-mounted systems can generate noise, the types of the vehicle-mounted systems are stored in the vehicle-mounted control device. And after receiving the detection instruction, the vehicle-mounted control device can control the corresponding vehicle-mounted system to stop running according to the stored type of the vehicle-mounted system. In addition, a person skilled in the art may flexibly set the preset working condition adopted when the vehicle electric drive system operates according to actual requirements, and the embodiment of the present invention is not particularly limited thereto.
In some embodiments, the onboard control device may be further configured to, after receiving the detection instruction, perform an alarm and not control the vehicle electric drive system to operate according to a preset operating condition if it is detected that the vehicle is not suspended and/or a preset onboard system that may generate noise does not stop operating. If the vehicle is not suspended, the vehicle electric drive system is controlled to operate, safety accidents are likely to happen, and life safety of personnel is endangered. If the vehicle-mounted system which can generate noise does not stop running, the sound signal generated by the electric drive system of the vehicle can be interfered, and the accuracy of detecting the failure of the component can be influenced. Therefore, if the operation of the preset vehicle-mounted system which generates noise is not stopped, the warning is also required to be carried out and the electric drive system of the vehicle is not controlled to operate according to the preset working condition.
Further, referring to fig. 2, in one implementation according to an embodiment of the present invention, the signal acquisition device may include a movable device body and an acoustic sensor array disposed on the device body. The acoustic sensor array can be moved to the suspended area at the bottom of the vehicle after the vehicle is suspended by moving the device body, and then the acoustic sensor array can be used for collecting sound signals generated in the running process of the vehicle electric driving system. The acoustic sensor array comprises at least two acoustic sensors, and the acoustic sensors are arranged on the movable device body according to a preset arrangement mode. For example, the acoustic sensors may be uniformly distributed along the circumferential direction, and the acoustic sensors may also be uniformly distributed in a matrix form, which is not particularly limited in the embodiment of the present invention.
The signal acquisition device can be flexibly arranged at different positions according to actual requirements through the movable device body. For example, the signal acquisition device can be moved to an empty region at the bottom of the vehicle when component failure detection is required to be performed on the vehicle electric drive system, and the signal acquisition device can be moved to a preset region for standby when component failure detection is not required to be performed on the vehicle electric drive system, wherein the preset region can be two sides of the battery replacement region when the component failure detection system is deployed in the battery replacement station, so that the signal acquisition device can be quickly moved to the empty region at the bottom of the vehicle when component failure detection is required to be performed on the vehicle electric drive system. The preset area can also be an equipment storage area far away from the battery replacement area, so that the current signal acquisition device can be stored independently when not used for a long time, and personnel or objects in the battery replacement station are prevented from damaging the signal acquisition device.
With continued reference to fig. 2, in another implementation manner according to the embodiment of the invention, the device body of the signal acquisition device is provided with a signal processing circuit, a communication circuit and a power circuit in addition to the acoustic sensor array.
The signal processing circuit can be used for denoising the sound signal collected by the acoustic sensor array, packaging the denoised sound signal according to a preset communication protocol, and sending the packaged sound signal to the signal analysis device through the communication circuit, wherein the preset communication protocol depends on the communication protocol adopted by the communication circuit, for example, if the communication circuit is a bluetooth communication circuit, the preset communication protocol is a bluetooth communication protocol.
The power supply circuit can be used for providing working power supply for the acoustic sensor array, the signal processing circuit and the communication circuit, and the acoustic sensor array, the signal processing circuit and the communication circuit can work normally. Specifically, the power circuit may receive power from an external power source, perform power conversion (for example, convert 220V ac power into 12V dc power) and voltage stabilization on the power, and transmit the processed power to the acoustic sensor array, the signal processing circuit, and the communication circuit.
It should be noted that, a person skilled in the art may employ a conventional signal denoising method to denoise a sound signal, and may also employ a conventional signal encapsulation method to encapsulate the denoised sound signal according to a preset communication protocol. The embodiment of the invention does not limit the specific method and principle of the signal denoising method and the signal packaging method.
Second, signal analysis device
The signal analysis device is in communication connection with the signal acquisition device through a preset communication mode, wherein the preset communication mode includes but is not limited to: wireless communication modes such as wifi and zigbee, and wired communication modes based on technologies such as can (controller Area network) bus. The signal analysis device may be configured to perform signal analysis on the sound signal collected by the signal collection device to determine whether a failure of a mechanical component of the vehicle electric drive system has occurred. Specifically, in the embodiment of the present invention, sound signals generated when the mechanical component fails may be collected, and the sound signals are analyzed to obtain the sound characteristics of the mechanical component when the mechanical component fails. When the signal analysis device analyzes the sound signal collected by the signal collection device, whether the sound signal contains the sound characteristic when the mechanical part fails or not can be analyzed, if yes, the mechanical part can be determined to have failed, and if not, the mechanical part can be determined not to have failed.
Further, in an implementation manner according to an embodiment of the present invention, the signal analysis apparatus may include a sound source localization module and a signal analysis module, which are specifically described below.
1. Sound source positioning module
The vehicle electric drive system will typically include various mechanical components such as gears and bearings, and the sound source localization module may be configured to perform sound source localization based on the sound signals to determine the mechanical components that produce the sound signals.
In this embodiment, according to the sound signals collected by the acoustic sensor array in the signal collection device, a sound source localization method that is conventional in the field of sound source localization technology is adopted to perform localization analysis on the sound signals collected by each acoustic sensor in the acoustic sensor array, so as to determine the position of the sound source, and the mechanical component located at this position is the mechanical component that generates the relevant sound signal.
For example, the sound signals collected by the acoustic sensors usually include signal strength and direction, and the position of the sound source can be determined according to the signal strength and direction of the sound signals collected by different acoustic sensors in the acoustic sensor array.
As shown in fig. 3, the signal strength of the sound signal collected by the acoustic sensor a is 2, the direction is 180 °, the signal strength of the sound signal collected by the acoustic sensor B is 2, the direction is 0 °, it can be determined that the distances from the acoustic sensor a and the acoustic sensor B to the sound source are the same and are located on the same horizontal line, and it can be determined that the position of the sound source is at the position shown by the solid circle in fig. 3.
As shown in fig. 4, the signal intensity of the sound signal collected by the acoustic sensor a is 2, the direction is 180 °, the signal intensity of the sound signal collected by the acoustic sensor B is 4, the direction is 0 °, it can be determined that the distance from the acoustic sensor a to the sound source is 2 times the distance from the acoustic sensor B to the sound source and that the acoustic sensor a and the acoustic sensor B are located on the same horizontal line, and it can be determined that the position of the sound source is at the position shown by the solid circle in fig. 4.
As shown in fig. 5, the signal strength of the sound signal collected by the acoustic sensor a is 2, the direction is 225 °, the signal strength of the sound signal collected by the acoustic sensor B is 2, the direction is 315 °, it can be determined that the distances from the acoustic sensor a and the acoustic sensor B to the sound source are the same, and further, the position of the sound source can be determined at the position shown by the solid circle in fig. 5 by the pythagorean theorem.
2. Signal analysis module
The signal analysis module may be configured to perform signal analysis on the acoustic signal to determine whether a failure of a mechanical component that generates the acoustic signal has occurred. Specifically, the signal analysis module may analyze whether the sound signal contains sound features when the mechanical component fails, and if so, may determine that the mechanical component has failed, and if not, may determine that the mechanical component has not failed.
In some embodiments, the signal analysis module may include a first signal analysis sub-module, and in this embodiment, the first signal analysis sub-module may be configured to perform spectrum analysis on the sound signals generated by different mechanical components, and determine whether there is a spectrum characteristic when the mechanical component fails according to a result of the spectrum analysis; if yes, judging that the corresponding mechanical part fails; and if not, judging that the corresponding mechanical part does not fail. The spectral feature when the mechanical component fails refers to a frequency domain signal that exists only when the mechanical component fails. For example, if the amplitude of the signal corresponding to a certain frequency f is d1 when the mechanical component is not failed, and d2 and d2 > d1 when the mechanical component is failed, the frequency-domain signal with the frequency f and the amplitude d2 can be used as the frequency spectrum characteristic when the mechanical component is failed.
In this embodiment, a time-domain frequency-domain conversion method, which is conventional in the signal processing technology field, may be adopted to perform time-domain frequency-domain conversion on the sound signal, so as to obtain a spectrogram (result of spectrum analysis) of the sound signal, where an abscissa of the spectrogram is a frequency of the signal, and an ordinate is an amplitude of the signal. For example, a Fast Fourier Transform (Fast Fourier Transform) may be used to perform a time-domain frequency-domain conversion on the sound signal to obtain a spectrogram of the sound signal. After obtaining the spectrogram of the sound signal, analyzing whether the spectrogram has the frequency spectrum characteristics when the mechanical part fails, if so, judging that the corresponding mechanical part fails, otherwise, judging that the corresponding mechanical part does not fail.
In other embodiments, the signal analysis module may include a second signal analysis sub-module, and in this embodiment, the second signal analysis sub-module may be configured to perform a fault classification training on a preset network model through a machine learning algorithm and using a training sample to obtain a fault recognition model, perform component failure analysis on sound signals generated by different mechanical components through the fault recognition model, and determine whether there is a spectrum feature when the mechanical component fails according to a result of the component failure analysis.
Specifically, the training samples include positive samples and negative samples, the positive samples refer to signal characteristics of a sound signal generated when the mechanical component fails, the negative samples refer to signal characteristics of a sound signal generated when the mechanical component does not fail, and the signal characteristics refer to characteristic information capable of representing signal states of the sound signal. In the embodiment of the present invention, the signal characteristics include, but are not limited to, time-domain signal characteristics and frequency-domain signal characteristics of the sound signal, the time-domain signal characteristics may be skewness, kurtosis, mean and the like of the signal, and the frequency-domain signal characteristics may be spectral sheath (spectral kurtosis) and the like of the signal. It should be noted that, although the embodiment of the present invention provides only several signal features, it can be understood by those skilled in the art that other types of signal features may be used as training samples to perform fault classification training on a preset network model without departing from the technical principle of the present invention, and the technical solution of changing or replacing the types of the signal features still falls within the protection scope of the present invention.
In this embodiment, a conventional model training method in the field of machine learning technology may be adopted to perform fault classification training on a preset network model, for example, a loss value of a classification loss function is calculated through forward propagation, a model parameter gradient of the preset network model is calculated according to the loss value, a model parameter is updated according to the model parameter gradient through backward propagation, and one-time iterative training is completed. By performing iterative training for a plurality of times, the training is stopped when the model satisfies a convergence condition (e.g., the loss value of the classification loss function is less than a certain value or the number of iterative training times reaches a set value).
It should be noted that, a person skilled in the art may flexibly select different networks to construct a Network model according to actual requirements, for example, a Convolutional Neural Network (Convolutional Neural Network) or a Support Vector Machine (Support Vector Machine) may be used to construct a preset Network model. In addition, it should be noted that, because a vehicle electric drive system usually includes a plurality of mechanical components, in order to accurately identify whether each mechanical component fails, a preset network model may be subjected to multi-class training by using positive and negative samples of different mechanical components at the same time, so that a fault identification model obtained after training can identify whether each mechanical component fails at the same time.
Further, in some embodiments, the signal analysis module may include both the first signal analysis sub-module and the second signal analysis sub-module.
The foregoing is a description of a component failure detection system for a vehicle electric drive system.
Further, the invention also provides a power swapping station.
In an embodiment of the power swapping station according to the present invention, the power swapping station may include a suspension mechanism, a battery loading and unloading mechanism, and other mechanisms capable of exchanging a power battery for a vehicle, and may further include a component failure detection system of the vehicle electric drive system according to the above system embodiment, where the component failure detection system may perform component failure detection on a vehicle entering the power swapping station for power swapping. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and details of the specific technology are not disclosed.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A component failure detection system for a vehicle electric drive system, said component failure detection system comprising signal acquisition means and signal analysis means;
the signal acquisition device is arranged in a suspended area at the bottom of the vehicle after the vehicle is suspended, and is configured to acquire sound signals in the process that the electric drive system of the vehicle operates according to a preset working condition;
the signal analysis device is configured to perform signal analysis on the sound signal collected by the signal collection device to determine whether a failure of a mechanical component of the vehicle electric drive system occurs.
2. The system for component failure detection of a vehicle electric drive system of claim 1, wherein the signal acquisition device comprises a movable device body and an acoustic sensor array disposed on the device body;
and/or the component failure detection system is deployed in a battery replacement station, the battery replacement station comprises a suspension mechanism, and the suspension mechanism can enable the vehicle to be suspended so as to conveniently replace a power battery of the vehicle.
3. A component failure detection system for a vehicle electric drive system according to claim 1, wherein said signal analysis device comprises a sound source localization module and a signal analysis module;
the sound source localization module is configured to perform sound source localization according to the sound signal to determine a mechanical component generating the sound signal;
the signal analysis module is configured to perform signal analysis on the acoustic signal to determine whether a failure of a mechanical component that generates the acoustic signal has occurred.
4. The system for detecting component failure of a vehicular electric drive system according to claim 3, wherein the signal analysis module includes a first signal analysis submodule configured to perform spectrum analysis on sound signals generated by different mechanical components, respectively, and determine whether there is a spectrum characteristic at the time of mechanical component failure based on a result of the spectrum analysis; if the failure judgment result is positive, judging that the corresponding mechanical part fails; and if not, judging that the corresponding mechanical part does not fail.
5. The system for detecting component failure of a vehicular electric drive system according to claim 3, wherein the signal analysis module further comprises a second signal analysis submodule configured to perform component failure analysis on sound signals generated by different mechanical components, respectively, through a fault recognition model, and determine whether there is a spectral characteristic at the time of mechanical component failure according to a result of the component failure analysis;
the fault recognition model is obtained by performing fault classification training on a preset network model through a machine learning algorithm and using a training sample, wherein the training sample comprises signal characteristics of a sound signal generated when the mechanical component fails and signal characteristics of a sound signal generated when the mechanical component does not fail.
6. The system for detecting component failure of a vehicle electric drive system according to claim 2, wherein the device body is further provided with a signal processing circuit and a communication circuit, the signal processing circuit is configured to denoise the sound signal collected by the acoustic sensor array, encapsulate the denoised sound signal according to a preset communication protocol, and transmit the encapsulated sound signal to the signal analysis device through the communication circuit.
7. The system for detecting component failure of an electric drive system for a vehicle according to claim 1, wherein a suspended area of a bottom of a vehicle after the vehicle is suspended is divided into a high-intensity sound signal area and a low-intensity sound signal area according to a model of the vehicle, and the signal collection device is disposed in the high-intensity sound signal area.
8. The system for detecting component failure of a vehicular electric drive system according to claim 1, further comprising an onboard control device disposed on the vehicle, wherein the onboard control device is configured to control a predetermined onboard system that generates noise to stop operating according to a received detection command when the vehicle is detected to be suspended and the power battery is not replaced, and further control the vehicular electric drive system to operate according to a predetermined operating condition, so that the signal acquisition device performs sound signal acquisition during the operation of the vehicular electric drive system according to the predetermined operating condition.
9. The system of claim 8, wherein the onboard control device is further configured to, after receiving the detection command, warn and not control the vehicle electric drive system to operate according to a predetermined condition if it is detected that the vehicle is not suspended and/or the predetermined on-board system that generates noise is not stopped.
10. A power swapping station comprising a suspension mechanism that enables a vehicle to be suspended for power battery replacement of the vehicle, the power swapping station further comprising a component failure detection system for a vehicle electric drive system as claimed in claims 1 to 7.
CN202210432092.5A 2022-04-22 2022-04-22 Component failure detection system of vehicle electric drive system and power exchange station Pending CN114720154A (en)

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CN202210432092.5A CN114720154A (en) 2022-04-22 2022-04-22 Component failure detection system of vehicle electric drive system and power exchange station

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CN202210432092.5A CN114720154A (en) 2022-04-22 2022-04-22 Component failure detection system of vehicle electric drive system and power exchange station

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