CN114838956A - Fault diagnosis method and device for electric drive system of electric drive vehicle - Google Patents
Fault diagnosis method and device for electric drive system of electric drive vehicle Download PDFInfo
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- CN114838956A CN114838956A CN202210490113.9A CN202210490113A CN114838956A CN 114838956 A CN114838956 A CN 114838956A CN 202210490113 A CN202210490113 A CN 202210490113A CN 114838956 A CN114838956 A CN 114838956A
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- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a method and a device for diagnosing faults of an electric drive system of an electric drive vehicle, which solve the technical problems of low diagnosis accuracy and low diagnosis response efficiency caused by the lack of effective technical means for diagnosing the faults of the electric drive system. The method comprises the following steps: determining a fault diagnosis object according to a topological structure among functional nodes in the electric drive system; classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classification and quantizing the fault influence factors; and controlling the output power of the electric drive system according to the fault influence factor and forming a fault processing strategy. And a step control based on the influence factors is adopted, and an electric drive system fault diagnosis strategy and an emergency fault treatment strategy are defined according to the fault types of different equipment. The hierarchical control means effectively solves the problems of multiple fault types, multiple quantities, strong coupling and complex processing modes of the special electric drive vehicle electric drive system.
Description
Technical Field
The invention relates to the technical field of vehicle drive control, in particular to a method and a device for diagnosing faults of an electric drive system of an electric drive vehicle.
Background
In the prior art, a special electric drive vehicle adopts a distributed driving mode, a plurality of wheel driving motors drive wheels in parallel, and the output torque of each motor is coordinately controlled according to the operation signal of a driver, so that the requirements of different running conditions are met.
The special electric drive vehicle electric drive system has the characteristic of multi-motor combined drive, the system is complex in structure, the types and the number of faults needing to be monitored and processed are large, the coupling is strong, the judgment on the correlation between the single-point fault grade and the single-point fault is complex, and the fault processing mode is influenced by the fault judgment and can have great influence on the reliable and stable running of the vehicle. Therefore, how to effectively diagnose the fault of the electric drive system is significant to the safe and efficient running of the vehicle.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide a method and an apparatus for diagnosing a fault of an electric drive system of an electric drive vehicle, which solve the technical problems of low diagnosis accuracy and low diagnosis response efficiency caused by lack of effective technical means for diagnosing a fault of an electric drive system.
The electric drive vehicle electric drive system fault diagnosis method of the embodiment of the invention comprises the following steps:
determining a fault diagnosis object according to a topological structure among functional nodes in the electric drive system;
classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classification and quantizing the fault influence factors;
and controlling the output power of the electric drive system according to the fault influence factor and forming a fault processing strategy.
In an embodiment of the present invention, the determining a fault diagnosis object according to a topology between functional nodes in an electric drive system includes:
extracting control function nodes according to a control topological structure among the function nodes and determining the number of the control function nodes;
extracting driving function nodes according to a control topological structure among the function nodes and determining the number of the driving function nodes;
and extracting the functional nodes to be executed according to the control topological structure among the functional nodes and determining the number of the functional nodes.
In an embodiment of the present invention, the classifying the fault type of the fault diagnosis object to form and quantify a fault influence factor of a corresponding classification includes:
dividing a first-level fault diagnosis level according to a loss function state in an electric drive system to form a fault influence factor and quantify the fault influence factor into fatalities;
dividing secondary fault diagnosis levels according to the serious fault state in the electric drive system to form fault influence factors and quantify the fault influence factors into serious fault states;
and dividing three levels of fault diagnosis levels according to a slight fault state in the electric drive system, forming a fault influence factor and quantifying to be slight.
In an embodiment of the present invention, the classifying the primary fault diagnosis level according to the loss function state in the electric drive system includes:
when the electric drive system controller is completely off-line, the quantification of the fault influence factor is fatal;
when a plurality of wheel edge driving motors are in fault, the quantification of fault influence factors is fatal;
when at least two motor drivers fail, the failure impact factor is quantified as fatal.
In an embodiment of the present invention, the classifying the secondary fault diagnosis level according to the serious fault state in the electric drive system includes:
when the electric drive system controller is offline, the fault influence factor is quantized to be serious;
when one wheel edge driving motor has a fault and the function is limited, the fault influence factor is quantized seriously;
when one motor drive fails and functions are limited, the failure impact factor is quantified as severe.
In an embodiment of the present invention, the classifying the three levels of fault diagnosis according to the slight fault state in the electric drive system includes:
when at least one driving motor fault exists, quantifying a fault influence factor to be slight;
when there is at least one motor drive failure, the failure impact factor is quantified to be slight.
In an embodiment of the present invention, the forming and quantifying the fault impact factors corresponding to the classifications includes:
the quantized data of the fault influence factor is set to be K ═ 0, and the fault is a fatal fault;
fault influencing factor K ═ min ((n) Total number of motors -n Number of fatal failures of motor )/n Total number of motors ，(n Total number of motor drivers -n Number of fatal failures of motor driver )/n Total number of motor drivers ) Serious failure;
the fault influence factor K is 1, and the fault is a slight fault.
In an embodiment of the present invention, the controlling the output power of the electric drive system and forming the fault handling policy according to the fault impact factor includes:
carrying out amplitude limiting on the driving power of the whole vehicle according to the fault influence factor;
setting a safe working temperature threshold value of a functional node in an emergency fault processing process as a boundary condition for the operation of an electric drive system;
the side regulation control unit is used for setting a safe working temperature threshold of the functional node in the conventional fault processing process as a boundary condition for the operation of the electric drive system;
when the fault influence factor is quantified as primary fault diagnosis of the driving motor, stopping torque output of the associated driving motor;
when the fault impact factor is quantified as a primary fault diagnosis of the motor driver, the associated drive motor is caused to stop torque output.
The electric drive vehicle electric drive system fault diagnosis device of the embodiment of the invention comprises:
a memory for storing program codes of a diagnosis process of the above-described electric drive vehicle electric drive system fault diagnosis method;
a processor for executing the program code.
The electric drive vehicle electric drive system fault diagnosis device of the embodiment of the invention comprises:
the diagnostic object definition module is used for determining a fault diagnostic object according to a topological structure among functional nodes in the electric drive system;
the influence factor quantization module is used for classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classification and quantizing the fault influence factors;
and the fault processing strategy module is used for controlling the output power of the electric drive system according to the fault influence factor and forming a fault processing strategy.
The method and the device for diagnosing the electric drive system fault of the electric drive vehicle in the embodiment of the invention adopt hierarchical control based on the influence factors, and define the fault diagnosis strategy and the emergency fault treatment strategy of the electric drive system according to the fault types of different devices. The hierarchical control means effectively solves the problems of multiple fault types, multiple quantities, strong coupling and complex processing modes of the special electric drive vehicle electric drive system.
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Fig. 1 is a schematic diagram of an electric drive system of an electric-driven vehicle according to an embodiment of the present invention.
Fig. 2 is a flow chart illustrating a method for diagnosing a fault in an electric drive system of an electric drive vehicle according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the electric drive system fault diagnosis device of the electric drive vehicle according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and more obvious, the present invention is further described below with reference to the accompanying drawings and the detailed description. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The electric drive system architecture of a special electric drive vehicle according to an embodiment of the present invention is shown in fig. 1. In fig. 1, the present embodiment mainly comprises an electric drive system controller, a motor driver, a wheel driving motor, a mechanical support structure, and electrical and network connection components. Wherein:
the electric drive system controller is used for forming synchronous drive data of each motor according to control requirements, acquiring feedback data of various states in the drive system, and forming a control-feedback-correction process according to a preset judgment strategy;
the motor driver is used for receiving corresponding synchronous driving data, forming a low-voltage power supply signal into a control signal of the internal power conversion module according to the synchronous driving data, and controlling the power conversion module to convert a high-voltage direct current signal into a power signal to be output in parallel; (ii) a
The paired driving motors are symmetrically arranged on two sides of the vehicle body and respectively receive power signals to drive the corresponding driving wheels to rotate in a controlled manner;
the CAN bus is used for forming a signal transmission bus between the control end and the controlled end, transmitting monitoring data in an uplink mode and transmitting control data in a downlink mode;
the low-voltage power supply bus is used for acquiring a working power supply forming a control signal;
the high-voltage direct-current power supply bus is used for obtaining a working power supply forming a power signal.
A method for diagnosing a fault in an electric drive system of an electrically driven vehicle according to an embodiment of the present invention is shown in fig. 2. In fig. 2, the present embodiment includes:
step 100: and determining a fault diagnosis object according to the topological structure among the functional nodes in the electric drive system.
Those skilled in the art can understand that the functional node includes a network element unit, and implements the corresponding function through the network element unit, and obtains the feedback state and the control state of the process of implementing the corresponding function through the network element unit. The functional nodes comprise control signal forming equipment, driving signal forming equipment and an executing mechanism, the types and the number of the functional nodes of the electric drive system are determined and realized through a topological structure obtained through control transmission among the functional nodes in the electric drive system, the functional nodes are used as fault diagnosis objects, and the functional states provided by the network element units in the functional nodes are used as fault diagnosis bases.
Step 200: and classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classifications and quantizing the fault influence factors.
And determining the qualitative type of the fault according to the relevance of empirical data and empirical judgment of the network element unit between the fault expression and the fault forming factors, and establishing a quantifiable fault influence factor for the qualitative type of each fault. And diagnosing the damage degree of the electric drive system fault through quantification of the fault influence factor.
Step 300: and controlling the output power of the electric drive system according to the fault influence factor and forming a fault treatment strategy.
The quantized data of the fault influence factors are used for controlling the output power of the electric drive system by taking the safe working threshold of the functional node as a boundary condition, so that the drive protection of the electrically driven vehicle under different fault levels is formed.
The electric drive vehicle electric drive system fault diagnosis method provided by the embodiment of the invention adopts hierarchical control based on the influence factors, and defines an electric drive system fault diagnosis strategy and an emergency fault treatment strategy according to fault types of different equipment. The hierarchical control means effectively solves the problems of multiple fault types, multiple quantities, strong coupling and complex processing modes of the special electric drive vehicle electric drive system.
As shown in fig. 2, in an embodiment of the present invention, step 100 includes:
step 110: and extracting control function nodes according to the control topological structure among the function nodes and determining the number of the control function nodes.
In one embodiment of the invention, there are a plurality of control function nodes, i.e. two electric drive system controllers forming a master and a slave.
Step 120: and extracting the driving function nodes according to the control topological structure among the function nodes and determining the number.
In an embodiment of the invention, there are multiple drive function nodes, i.e. motor drives controlled in parallel
Step 130: and extracting the function executing nodes according to the control topological structure among the function nodes and determining the number.
In an embodiment of the invention there are several groups of pairs of executing function nodes, i.e. synchronously controlled drive motors.
According to the electric drive system fault diagnosis method for the electric drive vehicle, the basic control characteristics of the fault diagnosis object and the fault diagnosis object are determined by determining the control and controlled incidence relation of the electric drive system, and a unified object basis is formed for fault judgment analysis and strategic fault elimination.
As shown in fig. 2, in an embodiment of the present invention, step 200 includes:
step 210: a primary fault diagnosis level is divided according to the loss function state in the electric drive system, and a fault influence factor is formed and quantified to be fatal.
A loss of function state includes, but is not limited to, failure, runaway or inefficiency of devices, signals, data, etc. that result in a functional node that has a missing drive function. The quantized data of the fault influence factor is set to K equal to 0, and is a fatal fault.
Step 220: and dividing secondary fault diagnosis grades according to the serious fault state in the electric drive system to form fault influence factors and quantify the fault influence factors into serious fault.
A critical fault condition includes, but is not limited to, a jump in stability, degradation, or non-measurability of a device, signal, data, etc. that causes a functional node to be functionally critical.
In one embodiment of the present invention, the fault impact factor K ═ min ((n) Total number of motors -n Number of fatal failures of motor )/n Total number of motors ，(n Total number of motor drivers -n Number of fatal failures of motor driver )/n Total number of motor drivers ) It is a serious failure.
Step 230: and dividing three levels of fault diagnosis levels according to the slight fault state in the electric drive system, forming a fault influence factor and quantifying to be slight.
Minor fault conditions include, but are not limited to, devices, signals, primary alarms for data, early fault threshold triggers or boundary signal feedback anomalies that cause functional node feedback that drives a minor fault in function, and the like. The fault influence factor K is 1, which is a minor fault.
According to the electric drive vehicle electric drive system fault diagnosis method, system fault analysis is carried out on the fault diagnosis object through fault feedback and function judgment, so that the fault influence factor quantificationally and truly reflects the fault grade of the whole electric drive system.
As shown in fig. 2, in an embodiment of the present invention, step 210 includes:
step 211: the fault impact factor quantifies fatal when the electric drive system controller is completely offline.
In one embodiment of the present invention, the offline status of all electric drive system controllers is characterized in terms of CAN bus status.
Step 212: when a plurality of wheel-side drive motors fail, the quantification of failure influence factors is fatal.
In one embodiment of the invention, when the total number of wheels of the vehicle is more than or equal to 6 and less than or equal to 8, the number of the driving motors which can normally work on one side of the vehicle is less than 1, and other fault motors are in a function loss state; when the number of the total wheels of the vehicle is more than or equal to 10 and less than or equal to 14, the number of the driving motors capable of normally working on one side of the vehicle is less than 2, and other fault motors are in a function loss state.
Step 213: when at least two motor drivers fail, the failure impact factor is quantified as fatal.
In one embodiment of the present invention, the number of (one-to-two) motor drivers that can work normally according to the vehicle is <2, and other faulty motor drivers are disabled.
As shown in fig. 2, in an embodiment of the present invention, step 220 includes:
step 221: the fault impact factor is quantified as severe when there is an electric drive system controller offline.
In one embodiment of the present invention, an off-line status of an electric drive system controller is characterized based on the CAN bus status.
Step 222: when one wheel-side driving motor fails and the function is limited, the failure influence factor is quantized to be serious.
In one embodiment of the invention, when the total number of wheels of the vehicle is less than or equal to 6 and less than or equal to 8, the number of wheel driving motors capable of normally working according to one side of the vehicle is more than or equal to 1, the number of wheel driving motor faults is more than or equal to 1, and the fault motor is in a state of function loss or torque output performance reduction; when the total number of the wheels of the vehicle is not less than 10 and not more than 14, the number of the wheel driving motors capable of normally working according to one side of the vehicle is not less than 2, the number of the wheel driving motor faults is not less than 1, and the fault motors are in a state of function loss or torque output performance reduction.
Step 223: when one motor drive fails and functions are limited, the failure impact factor is quantified as severe.
In an embodiment of the invention, the number of the motor drivers capable of working normally according to the vehicle is more than or equal to 2, the number of the motor driver faults is more than or equal to 1, and the faulty motor driver is in a state of function loss or torque output performance reduction.
As shown in fig. 2, in an embodiment of the present invention, step 230 includes:
step 231: when there is at least one drive motor fault, the fault impact factor is quantified to be slight.
In an embodiment of the invention, the number of the wheel edge driving motor faults is more than or equal to 1, the functions of the fault motors are not lost, and the torque output performance is not reduced.
Step 232: when there is at least one motor drive failure, the failure impact factor is quantified to be slight.
In an embodiment of the present invention, the number of motor driver failures is greater than or equal to 1, and the failed motor driver is in a state of no function loss and no torque output performance degradation.
According to the electric drive vehicle electric drive system fault diagnosis method, the comprehensive characteristic summarization of the system-level fault phenomenon is established by establishing the fault influence factor quantification process, the systematicness of fault diagnosis and the accuracy of system fault location are ensured, and effective remediation basis is provided for subsequent emergency strategies.
As shown in fig. 2, in an embodiment of the present invention, step 300 includes:
step 310: and carrying out amplitude limiting on the driving power of the whole vehicle according to the fault influence factor.
In one embodiment of the present invention, P Failure of entire vehicle drive ＝P Normal driving of the whole vehicle *K
Wherein: p Failure of entire vehicle drive The maximum allowable drive power of the electric drive system in a fault condition. P Normal driving of the whole vehicle The maximum allowable driving power allowed by the electric driving system in a normal state.
Step 320: and setting a safe working temperature threshold value of the functional node in the emergency fault processing process as a boundary condition for the operation of the electric drive system.
In one embodiment of the invention, in the emergency fault treatment process, the over-temperature shutdown protection threshold value of the driving motor is adjusted to be T Maximum allowable operating temperature of motor (ii) a Adjusting the over-temperature shutdown protection threshold value of the motor driver to T Maximum allowable operating temperature of motor controller 。
Step 330: setting a safe operating temperature threshold of the functional node during normal fault handling as a boundary condition for operation of the electric drive system.
In one embodiment of the invention, during the conventional fault handling process, the over-temperature shutdown protection threshold of the driving motor is adjusted to T Maximum allowable operating temperature of motor -T Margin Adjusting the over-temperature shutdown protection threshold value of the motor driver to T Maximum allowable operating temperature of motor controller -T Margin (2℃≤T Margin ≤5℃)。
Step 340: when the fault impact factor is quantified as a primary fault diagnosis of the drive motor, the associated drive motor is caused to stop torque output.
In an embodiment of the present invention, when the wheel-side driving motor on one side of the vehicle has a loss-of-function type failure and cannot output the torque, the electric driving system cuts off the torque output of the wheel-side driving motor corresponding to the other side of the vehicle.
Step 350: when the fault impact factor is quantified as a primary fault diagnosis of the motor driver, the associated drive motor is caused to stop torque output.
In an embodiment of the present invention, when the motor driver has a fault that causes the function of the wheel driving motor on one side of the vehicle to be lost and cannot output the torque, the electric drive system controls the motor driver to cut off the torque output of the wheel driving motor corresponding to the other side of the vehicle.
According to the electric drive vehicle electric drive system fault diagnosis method, reliability guarantee of vehicle electric drive availability under an emergency strategy is achieved through system operation boundary conditions and output power limitation. The usability and the reliability of the electric drive vehicle in the electric drive process are balanced, and the operation risk is reduced.
The invention discloses a fault diagnosis device for an electric drive system of an electric drive vehicle, which comprises the following components:
a memory for storing program codes of a diagnostic process of the electric drive system fault diagnosis method of the electrically driven vehicle of the above embodiment;
a processor for executing the program code of the diagnostic procedure of the electrically driven vehicle electric drive system fault diagnostic method of the above embodiment.
The electric drive system controller may be a processor, and may adopt a dsp (digital Signal processor), an FPGA (Field-Programmable Gate Array), an mcu (microcontroller unit) board, an soc (system on a chip) board, or a plc (Programmable Logic controller) minimum system including I/O.
A failure diagnosis apparatus for an electric drive system of an electrically driven vehicle according to an embodiment of the present invention is shown in fig. 3. In fig. 3, the present embodiment includes:
the diagnostic object definition module 10 is used for determining a fault diagnostic object according to a topological structure among functional nodes in the electric drive system;
the influence factor quantification module 20 is used for classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classifications and quantifying the fault influence factors;
and the fault handling strategy module 30 is used for controlling the output power of the electric drive system according to the fault influence factor and forming a fault handling strategy.
As shown in fig. 3, in an embodiment of the present invention, the diagnostic object locating module 10 includes:
a control object positioning unit 11, configured to extract control function nodes according to a control topology structure between the function nodes and determine the number of the control function nodes;
a driving object positioning unit 12, configured to extract driving function nodes according to a control topology structure between the function nodes and determine the number of the driving function nodes;
and the execution object positioning unit 13 is used for extracting the execution function nodes according to the control topological structure among the function nodes and determining the number of the execution function nodes.
As shown in fig. 3, in an embodiment of the present invention, the impact factor quantization module 20 includes:
a fatal factor forming unit 21 for classifying a primary failure diagnosis level according to a loss function state in the electric drive system, forming a failure influence factor and quantizing it to be fatal;
a severity factor forming unit 22, configured to classify a secondary fault diagnosis level according to a severity fault state in the electric drive system, form a fault influence factor, and quantify the fault influence factor as severity;
and a mild factor forming unit 23 for dividing three levels of fault diagnosis levels according to a mild fault state in the electric drive system, forming fault influence factors and quantifying to be mild.
As shown in fig. 3, in an embodiment of the present invention, the lethal factor forming unit 21 includes:
a first quantification subunit 21a for quantifying the fault impact factor to be fatal when the electric drive system controller is completely offline;
a second fatal quantizing subunit 21b for quantizing a failure influence factor into fatal when the plurality of wheel-side drive motors fail;
and a third fatal quantizing subunit 21c for quantizing the failure influence factor to be fatal when at least two motor drivers fail.
As shown in fig. 3, in an embodiment of the present invention, the severity factor forming unit 22 includes:
a first severity quantization subunit 22a for quantizing the fault impact factor to be severe when there is an electric drive system controller offline;
a second severity quantization subunit 22b, configured to quantize a failure impact factor to be severe when one wheel-side drive motor fails and is limited in function;
and a third severity quantization subunit 22c for quantizing the severity of the fault impact factor when one motor driver fails and is limited in function.
As shown in fig. 3, in an embodiment of the present invention, the mild factor forming unit 23 includes:
a first slight quantization subunit 23a for quantizing a failure influence factor to be slight when there is at least one failure of the drive motor;
a second slight quantizing subunit 23b for quantizing a failure influence factor to be slight when there is at least one motor driver failure.
As shown in fig. 3, in an embodiment of the present invention, the fault handling policy module 30 includes:
the power amplitude limiting unit 31 is used for carrying out amplitude limiting on the whole vehicle driving power according to the fault influence factor;
the emergency side control unit 32 is configured to set a safe working temperature threshold of the functional node in the emergency fault processing process as a boundary condition for operation of the electric drive system;
the conventional edge control unit 33 is configured to set a safe working temperature threshold of the functional node in the conventional fault handling process as a boundary condition for operation of the electric drive system;
a torque control unit 34 for stopping torque output of the associated drive motor when the failure influence factor is quantified as a primary failure diagnosis of the drive motor;
and a drive control unit 35 for stopping torque output of the associated drive motor when the failure influence factor is quantified as a primary failure diagnosis of the motor driver.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method of diagnosing a fault in an electric drive system of an electrically driven vehicle, comprising:
determining a fault diagnosis object according to a topological structure among functional nodes in the electric drive system;
classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classification and quantizing the fault influence factors;
and controlling the output power of the electric drive system according to the fault influence factor and forming a fault processing strategy.
2. The method for diagnosing faults in an electric drive system of an electric drive vehicle according to claim 1, wherein determining the fault diagnosis object based on a topology between functional nodes in the electric drive system includes:
extracting control function nodes according to a control topological structure among the function nodes and determining the number of the control function nodes;
extracting driving function nodes according to a control topological structure among the function nodes and determining the number of the driving function nodes;
and extracting the function executing nodes according to the control topological structure among the function nodes and determining the number.
3. The method for diagnosing faults in an electric drive system of a vehicle according to claim 1, wherein the classifying the fault type of the fault diagnosis object into the fault influence factors of the corresponding classification and quantifying the fault influence factors comprises:
dividing a first-level fault diagnosis level according to a loss function state in an electric drive system to form a fault influence factor and quantify the fault influence factor into fatalities;
dividing secondary fault diagnosis levels according to the serious fault state in the electric drive system to form fault influence factors and quantify the fault influence factors into serious fault states;
and dividing three levels of fault diagnosis levels according to the slight fault state in the electric drive system, forming a fault influence factor and quantifying to be slight.
4. A method of diagnosing a fault in an electric drive system of an electric drive vehicle as set forth in claim 3, wherein said classifying the primary fault diagnosis level according to a loss of function status in the electric drive system includes:
when the electric drive system controller is completely off-line, the quantification of the fault influence factor is fatal;
when a plurality of wheel edge driving motors are in fault, the quantification of fault influence factors is fatal;
when at least two motor drivers fail, the failure impact factor is quantified as fatal.
5. A method of diagnosing faults in an electric drive system of an electrically driven vehicle as claimed in claim 3 wherein said classifying secondary fault diagnosis levels based on severe fault conditions in the electric drive system comprises:
when the electric drive system controller is offline, the fault influence factor is quantized to be serious;
when one wheel edge driving motor has a fault and the function is limited, the fault influence factor is quantized seriously;
when one motor drive fails and functions are limited, the failure impact factor is quantified as severe.
6. The electric drive system fault diagnosis method of an electric drive vehicle of claim 3, wherein the classifying into three classes of fault diagnosis based on a slight fault condition in the electric drive system comprises:
when at least one driving motor fault exists, quantifying a fault influence factor to be slight;
when there is at least one motor drive failure, the failure impact factor is quantified to be slight.
7. The method of diagnosing faults in an electric drive system of an electric drive vehicle of claim 3 wherein the forming and quantifying the corresponding classification of fault impact factors comprises:
the quantized data of the fault influence factor is set to be K equal to 0, and the fault is a fatal fault;
fault influencing factor K ═ min ((n) Total number of motors -n Number of fatal failures of motor )/n Total number of motors ，(n Total number of motor drivers -n Number of fatal failures of motor driver )/n Total number of motor drivers ) Serious failure;
the fault influence factor K is 1, and the fault is a slight fault.
8. The method for diagnosing faults in an electric drive system of an electrically driven vehicle according to claim 1, wherein the controlling the output power of the electric drive system and forming a fault handling strategy based on the fault impact factor comprises:
carrying out amplitude limiting on the driving power of the whole vehicle according to the fault influence factor;
setting a safe working temperature threshold value of a functional node in an emergency fault processing process as a boundary condition for the operation of an electric drive system;
setting a safe working temperature threshold value of a functional node in a conventional fault processing process as a boundary condition for the operation of an electric drive system;
when the fault influence factor is quantified as primary fault diagnosis of the driving motor, stopping torque output of the associated driving motor;
when the fault impact factor is quantified as a primary fault diagnosis of the motor driver, the associated drive motor is caused to stop torque output.
9. An electrically driven vehicle electric drive system fault diagnosis device, comprising:
a memory for storing program codes of a diagnostic process of the electric drive vehicle electric drive system fault diagnosis method according to any one of claims 1 to 8;
a processor for executing the program code.
10. An electrically driven vehicle electric drive system fault diagnosis device, characterized by comprising:
the diagnostic object definition module is used for determining a fault diagnostic object according to a topological structure among functional nodes in the electric drive system;
the influence factor quantization module is used for classifying the fault types of the fault diagnosis objects to form fault influence factors of corresponding classification and quantizing the fault influence factors;
and the fault processing strategy module is used for controlling the output power of the electric drive system according to the fault influence factor and forming a fault processing strategy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210490113.9A CN114838956A (en) | 2022-05-07 | 2022-05-07 | Fault diagnosis method and device for electric drive system of electric drive vehicle |
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| CN202210490113.9A CN114838956A (en) | 2022-05-07 | 2022-05-07 | Fault diagnosis method and device for electric drive system of electric drive vehicle |
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