CN112115553B - Vehicle electromagnetic compatibility simulation method, device, storage medium and apparatus - Google Patents
Vehicle electromagnetic compatibility simulation method, device, storage medium and apparatus Download PDFInfo
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Abstract
The invention discloses a vehicle electromagnetic compatibility simulation method, equipment, a storage medium and a device, wherein an interference source and sensitive equipment in a vehicle system are topologically decomposed according to a coupling path to obtain a plurality of subsystems, port parameters of each subsystem are obtained, a multi-port network model of each subsystem is constructed, the multi-port network models of each subsystem are integrated according to a preset port connection relation to obtain a global network model, vehicle electromagnetic compatibility (EMC) simulation is carried out according to the global network model, and a simulation result is obtained.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a vehicle electromagnetic compatibility simulation method, vehicle electromagnetic compatibility simulation equipment, a storage medium and a vehicle electromagnetic compatibility simulation device.
Background
At present, with the development of the automobile industry, requirements for safety, comfort and functionality of an automobile are continuously increased, various devices such as wireless communication and radar systems are applied to the automobile, so that the Electromagnetic Compatibility problem of the automobile becomes very complex, prediction for the Electromagnetic Compatibility (EMC) problem of the automobile depends on EMC modeling simulation, the existing automobile EMC modeling method models the whole system of the automobile system, but for the Electromagnetic Compatibility problem with high complexity in the automobile system, the simulation speed of the existing modeling method is slow, so that the development cycle of the automobile is prolonged.
The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.
Disclosure of Invention
The invention mainly aims to provide a vehicle electromagnetic compatibility simulation method, vehicle electromagnetic compatibility simulation equipment, a vehicle electromagnetic compatibility simulation storage medium and a vehicle electromagnetic compatibility simulation device, and aims to solve the technical problem that the simulation speed is low for an electromagnetic compatibility problem with high complexity in the prior art.
In order to achieve the above object, the present invention provides a vehicle electromagnetic compatibility simulation method, including the steps of:
carrying out topology decomposition on an interference source and sensitive equipment in a vehicle system according to the coupling path to obtain a plurality of subsystems;
acquiring port parameters of each subsystem, and constructing a multi-port network model of each subsystem according to the port parameters;
integrating the multi-port network models of all the subsystems according to the preset port connection relation to obtain a global network model;
and carrying out vehicle electromagnetic compatibility (EMC) simulation according to the global network model, and obtaining a simulation result.
Preferably, the step of performing topology decomposition on the interference source and the sensitive device in the vehicle system according to the coupling path to obtain a plurality of subsystems includes:
acquiring coupling information of a coupling path;
and carrying out topology decomposition on the interference source and the sensitive equipment in the vehicle system according to the coupling information to obtain a plurality of subsystems.
Preferably, the step of obtaining the port parameters of each subsystem and constructing the multi-port network model of each subsystem according to the port parameters specifically includes:
taking a signal input port and a signal output port of an automobile part contained in each subsystem as subsystem ports corresponding to the subsystems;
determining a port coupling coefficient according to the electrical size of the subsystem port;
determining a port excitation characteristic and a port load characteristic according to an electrical small size, wherein the electrical small size is an electrical small size inside a part of the interference source and/or an electrical small size inside a part of the sensitive equipment;
and constructing a multi-port network model of each subsystem according to the port coupling coefficient, the port excitation characteristic and the port load characteristic.
Preferably, the step of constructing a multi-port network model of each subsystem according to the port coupling coefficients, the port excitation characteristics and the port load characteristics includes:
constructing black boxes of the multi-port network of each subsystem according to the port coupling coefficients;
constructing equivalent circuits corresponding to the multi-port networks of the subsystems according to the port excitation characteristics and the port load characteristics;
and constructing a multi-port network model of each subsystem according to the black boxes and the equivalent circuits.
Preferably, the step of integrating the multi-port network model of each subsystem according to the preset port connection relationship to obtain a global network model includes:
acquiring an impedance matrix corresponding to the multi-port network model of each subsystem;
integrating the impedance matrix according to a preset port connection relation to obtain a port coupling coefficient matrix of the global network;
and constructing a global network model according to the port coupling coefficient matrix.
Preferably, the step of integrating the impedance matrix according to a preset port connection relationship to obtain a port coupling coefficient matrix of the global network specifically includes:
determining an interconnection port of the multi-port network model according to a preset port connection relation;
acquiring an interference source port corresponding to the interference source and a sensitive equipment port corresponding to the sensitive equipment;
and integrating the impedance matrixes corresponding to the interconnection port, the interference source port and the sensitive equipment port according to the preset port connection relation to obtain a port coupling coefficient matrix of a global network model.
Preferably, the step of performing vehicle electromagnetic compatibility EMC simulation according to the global network model and obtaining a simulation result includes:
performing vehicle electromagnetic compatibility (EMC) simulation according to the global network model, and acquiring a matrix relation between the sensitive equipment port and the interference source port;
constructing a first selection matrix corresponding to the sensitive equipment and a second selection matrix corresponding to the interference source according to the matrix relation;
constructing a voltage matrix and a current matrix corresponding to the multi-port network model according to the selected matrix corresponding to the interconnection port;
determining a target voltage of the sensitive equipment port according to the port coupling coefficient matrix, the first selection matrix, the second selection matrix, the voltage matrix and the current matrix;
and determining the sensitivity of the sensitive equipment to interference according to the target voltage, and obtaining a simulation result.
Further, in order to achieve the above object, the present invention also proposes a vehicle electromagnetic compatibility simulation device, which includes a memory, a processor, and a vehicle electromagnetic compatibility simulation program stored on the memory and executable on the processor, the vehicle electromagnetic compatibility simulation program being configured to implement the steps of the vehicle electromagnetic compatibility simulation as described above.
Furthermore, in order to achieve the above object, the present invention further provides a storage medium having a vehicle electromagnetic compatibility simulation program stored thereon, which when executed by a processor implements the steps of the vehicle electromagnetic compatibility simulation method as described above.
In addition, in order to achieve the above object, the present invention also provides a vehicle electromagnetic compatibility simulation apparatus, including:
the structure decomposition module is used for carrying out topology decomposition on an interference source and sensitive equipment in the vehicle system according to the coupling path to obtain a plurality of subsystems;
the data acquisition module is used for acquiring the port parameters of each subsystem and constructing a multi-port network model of each subsystem according to the port parameters;
the system integration module is used for integrating the multi-port network models of the subsystems according to the preset port connection relation to obtain a global network model;
and the modeling simulation module is used for carrying out vehicle electromagnetic compatibility (EMC) simulation according to the global network model and obtaining a simulation result.
According to the method, topology decomposition is carried out on an interference source and sensitive equipment in a vehicle system according to a coupling path to obtain a plurality of subsystems, port parameters of each subsystem are obtained, a multi-port network model of each subsystem is built according to the port parameters, the multi-port network models of each subsystem are integrated according to a preset port connection relation to obtain a global network model, vehicle electromagnetic compatibility (EMC) simulation is carried out according to the global network model, and a simulation result is obtained.
Drawings
FIG. 1 is a schematic structural diagram of a vehicle electromagnetic compatibility simulation device of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a vehicle electromagnetic compatibility simulation method according to the present invention;
FIG. 3 is a schematic flow chart of a vehicle electromagnetic compatibility simulation method according to a second embodiment of the present invention;
FIG. 4 is a schematic flowchart of a third embodiment of a vehicle electromagnetic compatibility simulation method according to the present invention;
fig. 5 is a block diagram showing the structure of a first embodiment of the vehicle electromagnetic compatibility simulation apparatus of the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle electromagnetic compatibility simulation device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the vehicle electromagnetic compatibility simulation apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to implement connection communication among these components. The user interface 1003 may include a Display screen (Display), and the optional user interface 1003 may further include a standard wired interface and a wireless interface, and the wired interface for the user interface 1003 may be a USB interface in the present invention. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory or a Non-volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001 described previously.
Those skilled in the art will appreciate that the configuration shown in FIG. 1 does not constitute a limitation of the vehicle electromagnetic compatibility simulation apparatus, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in FIG. 1, a memory 1005, identified as one type of computer storage medium, may include an operating system, a network communications module, a user interface module, and a vehicle electromagnetic compatibility simulation program.
In the vehicle electromagnetic compatibility simulation device shown in fig. 1, the network interface 1004 is mainly used for connecting a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting user equipment; the vehicle electromagnetic compatibility simulation device calls a vehicle electromagnetic compatibility simulation program stored in a memory 1005 through a processor 1001 and executes the vehicle electromagnetic compatibility simulation method provided by the embodiment of the invention.
Based on the hardware structure, the embodiment of the vehicle electromagnetic compatibility simulation method is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the vehicle electromagnetic compatibility simulation method of the present invention, and proposes the first embodiment of the vehicle electromagnetic compatibility simulation method of the present invention.
In a first embodiment, the vehicle electromagnetic compatibility simulation method includes the steps of:
step S10: and carrying out topology decomposition on the interference source and the sensitive equipment in the vehicle system according to the coupling path to obtain a plurality of subsystems.
It should be noted that, in the execution main body vehicle-mounted computer of the embodiment, the vehicle-mounted computer is a special vehicle informatization product which is developed specially for the special operating environment of the vehicle and the characteristics of the electric circuit, has the functions of high temperature resistance, dust resistance and shock resistance, and can be fused with the electronic circuit of the vehicle. The vehicle-mounted computer can be equipment with a simulation function, the vehicle-mounted computer can be mounted on a vehicle model with a vehicle body and an electrical component structure, and can also be an actual vehicle to be detected, wherein the vehicle model can be a simple model constructed by extracting metal on the surface of the vehicle body from a three-dimensional design drawing of the vehicle, and the electrical component structure can be mounted on the vehicle model through physical modeling.
It should be understood that the coupling path in this embodiment may be a path or medium for transmitting electromagnetic interference, and the coupling path is generally divided into a conductive coupling path and a radiation coupling path. The Interference source may be a device or system that transmits Electromagnetic Interference energy to a sensitive device, and the sensitive device may be a device, subsystem or system that may be electromagnetically harmed when acted on by Electromagnetic energy emitted by the Electromagnetic Interference source, resulting in performance degradation or failure, and the Electromagnetic Interference (EMI) may be Electromagnetic noise generated by the device or component itself in the vehicle system during performance of the intended function and harmful to other systems or devices, and the Electromagnetic Interference may be both conducted Interference and radiated Interference. Conducted interference refers to coupling (interfering) a signal on one electrical network to another electrical network through a conductive medium. Radiated interference refers to interference sources coupling (interfering) their signals through space to another electrical network.
It is understood that the topology decomposition may be a division of the vehicle system according to the coupling manner and coupling strength of the interference source and the sensitive device, and the division of the vehicle system into a plurality of subsystems according to the topology decomposition, and the subsystems may be a system formed by dividing the vehicle system through a conductive coupling path and a radiation coupling path.
In specific implementation, the vehicle-mounted computer can divide interference sources and sensitive equipment in a vehicle system according to the coupling mode and the coupling strength of the coupling path to obtain a plurality of subsystems.
Step S20: and acquiring port parameters of each subsystem, and constructing a multi-port network model of each subsystem according to the port parameters.
It should be noted that the port parameter may be a model parameter corresponding to each system port of the vehicle model or a model parameter corresponding to a component, or may also be a parameter corresponding to a port coupling coefficient, a port excitation characteristic, a port load characteristic, and the like of each subsystem in the vehicle system, for example, the parameter corresponding to the component may be a transmission power of an interference source, such as a transmission power of an antenna.
In specific implementation, the vehicle-mounted computer can construct a multi-port network model of each subsystem according to parameters such as port coupling coefficients, port excitation characteristics and port load characteristics of each subsystem, the multi-port network model can be a black box part of a multi-port network constructed according to the port coupling coefficients between an interference source and sensitive equipment, and the port excitation characteristics and the port load characteristics of the subsystems are used for constructing equivalent circuits corresponding to the multi-port network.
Step S30: and integrating the multi-port network models of all the subsystems according to the preset port connection relation to obtain a global network model.
It should be noted that the preset port connection relationship may be a port connection relationship between an interference source port corresponding to an interference source and a sensitive device port corresponding to a sensitive device, the global network model may be a model obtained by integrating a plurality of multiport network models, the interference source ports, and the sensitive device ports, and the integration may be that the multiport network models of all subsystems in the vehicle system are integrated to construct a multiport network model aggregate, all interference source ports in the vehicle system are integrated to construct an interference source port aggregate, all sensitive device ports are integrated to construct a sensitive pen-related port aggregate, and the interference source port aggregate, the sensitive device port aggregate, and the multiport network model aggregate are connected according to the preset port connection relationship.
In specific implementation, a plurality of multiport network models, interference source ports and sensitive equipment ports are integrated according to a preset port connection relation to obtain a global network model.
Step S40: and carrying out vehicle electromagnetic compatibility (EMC) simulation according to the global network model, and obtaining a simulation result.
It should be noted that the electromagnetic compatibility may refer to an ability of a device or a system to operate in compliance with a requirement in an electromagnetic environment thereof and not generate intolerable electromagnetic interference to any device in the environment thereof, and the simulation result may be a sensitivity of the sensitive device calculated by inputting the model parameters into the vehicle-mounted computer, so as to obtain a degree of interference of the interfering source to the sensitive device.
In the concrete implementation, three factors mainly influencing electromagnetic compatibility in a vehicle system can be an interference source, a coupling path and sensitive equipment, the interference source, the coupling path and the sensitive equipment can generate an electromagnetic compatibility problem in the vehicle system, the electromagnetic compatibility problem can be a corresponding problem generated when electromagnetic interference generated to the environment in the vehicle system in the normal operation process exceeds a certain limit value, in the actual life, electronic equipment in the vehicle system is widely applied to an automobile engine control system, an automatic speed change system, a brake system, an adjusting system and a driving system, plays a role in determining the safety, reliability and comfort of an automobile, a vehicle-mounted computer can perform simulation calculation on model parameters and port parameters when detecting the electromagnetic compatibility problem to obtain the port voltage of the sensitive equipment, the interference degree of the interference source on the sensitive equipment can be determined according to the port voltage to obtain a simulation result, and the stability of the vehicle to be tested can be determined according to the simulation result.
According to the method, topology decomposition is carried out on an interference source and sensitive equipment in a vehicle system according to a coupling path to obtain a plurality of subsystems, port parameters of each subsystem are obtained, a multi-port network model of each subsystem is built according to the port parameters, the multi-port network models of each subsystem are integrated according to a preset port connection relation to obtain a global network model, vehicle electromagnetic compatibility (EMC) simulation is carried out according to the global network model, and a simulation result is obtained; compared with the prior art, the multi-port network modeling method has the advantages that the coupling coefficients of the sub-system ports are not affected, the simulation time is shortened, the simulation speed is increased, and the vehicle development period is integrally reduced.
Referring to fig. 3, fig. 3 is a schematic flow chart of a vehicle low-temperature starting method according to a second embodiment of the present invention, which is proposed based on the first embodiment shown in fig. 2.
In a second embodiment, the step S10 includes:
step S101: coupling information of the coupling path is acquired.
It should be noted that the coupling path may be a conductive coupling path and/or a radiative coupling path, the coupling information may be a coupling manner and a coupling strength of the coupling path, the coupling manner may be a conductive coupling manner and a radiative coupling manner, and the coupling strength may be a coupling strength of the conductive coupling and/or a radiation strength of the radiative coupling.
It will be appreciated that the coupling path may be a complex fused path and that both conductive and radiative coupling may exist simultaneously, forming a composite coupling path.
In specific implementation, the vehicle-mounted computer can acquire the coupling mode and the coupling strength of the coupling path between the interference source and the equipment from a vehicle system.
Step S102: and carrying out topology decomposition on the interference source and the sensitive equipment in the vehicle system according to the coupling information to obtain a plurality of subsystems.
It should be noted that the topology decomposition may be to decompose coupling information corresponding to a coupling path between an interference source and a sensitive device in a vehicle system, and the coupling path may be decomposed according to a coupling manner and a coupling strength.
In specific implementation, when the current coupling path is a conductive coupling path, a mode of modeling an equivalent circuit for an interference source and sensitive equipment can be adopted, the actual circuit structures of the interference source and the sensitive equipment are replaced by the equivalent circuit, and only the equivalent circuit model is required to accurately reflect the relevant electrical characteristics of the EMC. For an excessively complex system, the coupling path is correspondingly complex, and the coupling path can be decomposed according to the coupling mode and the coupling strength, and then modeling can be performed on the subsystem.
In the second embodiment, the step S20 includes:
step S201: and taking the signal input port and the signal output port of the automobile part contained in each subsystem as the subsystem port corresponding to the subsystem.
It should be noted that the automobile component may be a component of an automobile electronic system, such as a tire pressure detecting device, an anti-skid anti-lock brake device, an automobile tachograph, or the like, installed inside or outside an automobile body, the signal input port may be a port for inputting a control signal, and the signal output port may be a signal output by a sensor in the automobile. The signal input port and the signal output port can be ports for data, information exchange and control between external equipment or vehicle system circuits and a CPU in the vehicle-mounted computer, and can also be communication ports used when the vehicle-mounted computer directly performs digital communication with other systems.
In the specific implementation, the vehicle-mounted computer can take the signal input port and the signal output port corresponding to the automobile part contained in the subsystem as the subsystem ports, and the mutual independence of the signal input port and the signal output port is kept, so that the interference is avoided.
Step S202: determining a port coupling coefficient based on an electrical size of the subsystem port.
It should be noted that the electrical size may be determined according to a distance of wave propagation, and may be a ratio of a maximum physical length of a component in a vehicle model to an operating wavelength, the electrical size may include an electrical large size and an electrical small size, the port coupling coefficient may be a value representing a degree of tightness of coupling between ports in a circuit, and a ratio of an actual mutual inductance absolute value between the two inductive element ports to a mutual inductance limit value is defined as the coupling coefficient.
In the specific implementation, the on-board computer may divide the port coupling tightness degree according to the wavelength ratio of the subsystem port, for example, the on-board computer may perform three-dimensional modeling according to the surface metal structure of the subsystem, the cable, the antenna, and other large dimensions, extract the coupling coefficient in a numerical simulation manner, or may actually measure the S parameter and calculate the coupling coefficient by using a network analyzer, the S parameter may reflect the frequency domain characteristic of the coupling path, and many passive devices such as the cable, the connector, the PCB trace, and other transmission media may exhibit such a characteristic, and thus may be represented by the S parameter, for example, in a power transformer, in order to effectively transmit power, tight coupling is adopted, and in the radio and communication aspects, when appropriate and loose coupling is required, the mutual positions of the two coils need to be adjusted, and in order to avoid the coupling effect, the positions of the coils should be reasonably arranged, so as to be far away.
Step S203: determining a port excitation characteristic and a port load characteristic according to an electrical small size, wherein the electrical small size is an electrical small size inside a part of the interference source and/or an electrical small size inside a part of the sensitive device.
It should be noted that the electrically small size may be a size corresponding to a predetermined range of wavelengths smaller than a physical size inside the component. The port can be an outlet for communication between the equipment and the outside, and can be divided into a virtual port and a physical port. The port excitation characteristic may be a property corresponding to when energy is allowed to enter or exit a boundary condition of the geometry, and the port load characteristic may be a port characteristic corresponding to when the port converts electrical energy into other forms of energy in the electrical circuit.
It is understood that the inside of the interference source component can be a circuit board inside a component in the device or system emitting electromagnetic interference, and the inside of the sensitive device component can be a circuit board inside a component in the device or system interfered by the interference source electromagnetic interference.
In specific implementation, the port load of the subsystem can be measured by an impedance measuring instrument and the corresponding port load characteristic is determined, the port excitation of the subsystem can be realized by measuring the electromagnetic interference current by a current coupling clamp and combining the load characteristic, calculating to obtain the equivalent source voltage and determining the corresponding port excitation characteristic.
Step S204: and constructing a multi-port network model of each subsystem according to the port coupling coefficient, the port excitation characteristic and the port load characteristic.
It should be noted that the multiport network model may be a network model in which the number n of overhanging terminals is equal to or greater than 3.
In specific implementation, when a vehicle-mounted computer recombines and simplifies complex circuits, the multi-port network model can greatly reduce the number of passive and active devices, reduce the complexity and nonlinear effect of the circuits, simplify the relation between network input and output characteristics, and construct the multi-port network model of each subsystem according to port coupling coefficients, port excitation characteristics and port load characteristics.
Furthermore, in order to make the simulation flexible and realize more accurate modeling, black boxes of the multi-port network of each subsystem can be constructed according to the port coupling coefficients; constructing equivalent circuits corresponding to the multi-port networks of the subsystems according to the port excitation characteristics and the port load characteristics; and constructing a multi-port network model of each subsystem according to the black boxes and the equivalent circuits.
It should be noted that the black box can be used to determine the network input and output parameters through experiments without knowing the internal structure of the system.
It should be noted that the equivalent circuit is a circuit in which a complex structure circuit externally connected to a multiport network is replaced by a simple structure, and the replaced circuit and the original circuit keep the same action and effect on the unconverted part.
It will be appreciated that to simplify modeling, typically the electrically large size of a vehicle system can be described using a network and the electrically small size can be described using an equivalent circuit.
In the concrete implementation, the coupling degree between the ports is determined according to the port coupling coefficient, the black box of the multi-port network model is constructed, and the circuit externally connected with the black box keeps the same action effect as the original circuit by an equivalent circuit method, so that the connected complex circuit is simplified, and the multi-port model corresponding to the subsystem is obtained.
In the embodiment, coupling information of a coupling path is acquired, an interference source and sensitive equipment in a vehicle system are subjected to topology decomposition according to the coupling information to obtain a plurality of subsystems, a signal input port and a signal output port of an automobile part included in each subsystem are used as subsystem ports corresponding to the subsystems, a port coupling coefficient is determined according to an electrical size of the subsystem port, a port excitation characteristic and a port load characteristic are determined according to an electrical small size, wherein the electrical small size is the electrical small size inside the part of the interference source and/or the electrical small size inside the part of the sensitive equipment, a multi-port network model of each subsystem is constructed according to the port coupling coefficient, the port excitation characteristic and the port load characteristic, the multi-port network models of each subsystem are integrated according to a preset port connection relation to obtain a global network model, vehicle electromagnetic compatibility (EMC) simulation is performed according to the global network model, and a simulation result is obtained. Because a multi-port network model is constructed according to port coupling coefficients, port excitation characteristics and port load characteristics, coupling paths with large electrical sizes of subsystems are integrated into the multi-port network according to different electrical sizes, and interference sources with small electrical sizes of the subsystems and sensitive equipment are constructed into an equivalent circuit.
Referring to fig. 4, fig. 4 is a schematic flow chart of a vehicle low-temperature starting method according to a third embodiment of the present invention, which is proposed based on the first embodiment shown in fig. 2.
In a third embodiment, the step S30 includes:
step S301: and acquiring an impedance matrix corresponding to the multi-port network model of each subsystem.
It should be noted that the impedance relationship between the current and the voltage in the multiport network is presented in the form of an impedance matrix.
The impedance matrix includes: an input end impedance matrix of the sensitive equipment port; disturbing a transfer impedance matrix from a source port to a sensitive device port; a transfer impedance matrix from the sensitive device port to the interference source port; an input end impedance matrix of the interference source port; a transfer impedance matrix of the subsystem interconnect port to the sensitive device port; a transfer impedance matrix from the subsystem interconnection port to the interference source port; a transfer impedance matrix from the sensitive equipment port to the subsystem interconnection port; a transfer impedance matrix from the interference source port to the subsystem interconnection port; the input end impedance matrix and the transfer impedance matrix of the subsystem interconnection port.
Step S302: and integrating the impedance matrix according to a preset port connection relation to obtain a port coupling coefficient matrix of the global network.
It should be noted that the preset port connection relationship may be a relationship between the port number and the maximum connection number, a relationship between all interference sources, a relationship between an interference source and a sensitive device, or a relationship between all sensitive devices.
It can be understood that the predetermined port connection relationship is related to the coupling manner and the coupling strength of the coupling path.
In specific implementation, the vehicle-mounted computer can integrate impedance matrixes corresponding to the interference source and the sensitive equipment according to the relationship between the port number and the maximum connection number to obtain a port coupling coefficient matrix of the global network.
Step S303: and constructing a global network model according to the port coupling coefficient matrix.
It should be noted that the port coupling coefficient matrix is a matrix corresponding to the global network.
Further, the step 302 further includes: determining an interconnection port of the multi-port network model according to a preset port connection relation; acquiring an interference source port corresponding to the interference source and a sensitive equipment port corresponding to the sensitive equipment; and integrating the impedance matrixes corresponding to the interconnection port, the interference source port and the sensitive equipment port according to the preset port connection relation to obtain a port coupling coefficient matrix of a global network model.
It should be noted that the interconnection port may be a serial or parallel port.
In specific implementation, the port coupling coefficient matrix of the global network is:
wherein the content of the first and second substances,
Z sen,sen (s) an ingress impedance matrix representing the ports of the sensitive device;
Z sen,exc (s) a transfer impedance matrix representing the source port of the interferer to the sensitive device port;
Z exc,sen (s) a transfer impedance matrix representing the sensitive device port to the interfering source port;
Z exc,exc (s) an ingress impedance matrix representing an interfering source port;
Z sen , q (s)、Z sen , p (s) representing a transfer impedance matrix of the subsystem interconnect port to the sensitive device port;
Z exc , q (s)、Z exc , p (s) a transfer impedance matrix representing the subsystem interconnect port to the aggressor port;
Z q , sen (s)、Z p , sen (s) a transfer impedance matrix representing the sensitive device port to subsystem interconnect port;
Z q , exc (s)、Z p , exc (s) a transfer impedance matrix representing the source port to subsystem interconnect port interference;
Z q,q (s)、Z p,p (s)、Z q,p (s)、Z p,q and(s) representing an input end impedance matrix and a transfer impedance matrix of the subsystem interconnection port.
In a specific implementation, the impedance matrices are integrated into one matrix according to three matrix relationships of a sensitive device port, an interference source port and an interconnection port, a first column is a relevant impedance matrix from the sensitive device to other ports, a second column is a relevant impedance matrix from the interference source port to other ports, and a third column and a fourth column are relevant impedance matrices from the interconnection port to other ports.
Further, in order to improve the simulation speed and achieve accurate modeling of a multiport network, the method may further include, after integrating the impedance matrices corresponding to the interconnection port, the interference source port, and the sensitive device port according to the preset port connection relationship to obtain a port coupling coefficient matrix of a global network model: acquiring a matrix relation between the sensitive equipment port and the interference source port; constructing a first selection matrix corresponding to the sensitive equipment and a second selection matrix corresponding to the interference source according to the matrix relation; constructing a voltage matrix and a current matrix corresponding to the multi-port network model according to the selection matrix corresponding to the interconnection port; determining a target voltage of the sensitive equipment port according to the port coupling coefficient matrix, the first selection matrix, the second selection matrix, the voltage matrix and the current matrix; and determining the sensitivity of the sensitive equipment to the interference source according to the target voltage.
It should be noted that the matrix relationship may be a first selection matrix and a second selection matrix constructed according to a constraint relationship between an interference source and a sensitive device of the multi-port network port.
In a specific implementation manner, the first and second sensors are arranged in a linear array,
G sen ＝[E sen 0 0 0]
G exc ＝[0 E exc 0 0]
the selection matrix is for the interferer and the sensitive device port, where G sen Is a first selection matrix, G, corresponding to the sensitive device exc Is a second selection matrix corresponding to the interference source, E sen As an identity matrix corresponding to the ports of the sensitive equipment, E exc Is an identity matrix corresponding to the interfering source port.
G U ＝[0 0 E q -E p ]
G I ＝[0 0 Eq Ep]
The selection matrix is for the interconnect port, where G U Is a voltage matrix, G I Is a current matrix E q 、E p An identity matrix corresponding to half the number of ports, respectively, of the interconnected ports.
And finally, calculating to obtain the voltage of an EMC problem target port of the whole vehicle:
wherein, the first and the second end of the pipe are connected with each other,
i(s) is noise current and can be measured on a connecting wire harness at an excitation port by using a current coupling clamp under the condition of an actual vehicle or a part;
U sen (s) is the noise current;
i(s) noise voltage generated at the sensitive device port;
Z R (s) is a diagonal matrix of the impedance of the load end of the harness, which can be used for impedance measurements in real vehicle or component conditionsThe measuring instrument measures the load impedance of the wire harness connected with the subsystem;
Z s (s) is a diagonal matrix of the impedance of the wiring harness interference source end, and can be obtained by measuring the excitation impedance of the wiring harness of the connection subsystem by using an impedance measuring instrument under the condition of a real vehicle or a part;
and Z(s) is a port coupling coefficient matrix.
In the embodiment, a plurality of subsystems are obtained by performing topology decomposition on an interference source and sensitive equipment in a vehicle system according to a coupling path, port parameters of each subsystem are obtained, a multi-port network model of each subsystem is built according to the port parameters, an impedance matrix corresponding to the multi-port network model of each subsystem is obtained, the impedance matrices are integrated according to a preset port connection relation to obtain a port coupling coefficient matrix of a global network, a global network model is built according to the port coupling coefficient matrix, vehicle electromagnetic compatibility (EMC) simulation is performed according to the global network model, and a simulation result is obtained. According to the embodiment, the defect that a transfer function is easily influenced by port impedance is overcome through the characteristic that the port coupling coefficient of the multiport network is decoupled from the port impedance, and independent modeling and independent simulation of subsystems are realized.
Furthermore, an embodiment of the present invention further provides a storage medium, where a vehicle electromagnetic compatibility simulation program is stored, and the vehicle electromagnetic compatibility simulation program implements the steps of the vehicle electromagnetic compatibility simulation method described above when executed by a processor.
Referring to fig. 5, fig. 5 is a block diagram illustrating a first embodiment of the vehicle electromagnetic compatibility simulation apparatus according to the present invention.
As shown in fig. 5, a vehicle electromagnetic compatibility simulation apparatus according to an embodiment of the present invention includes:
the structure decomposition module 10 is used for performing topology decomposition on an interference source and sensitive equipment in the vehicle system according to the coupling path to obtain a plurality of subsystems;
the data acquisition module 20 is configured to acquire port parameters of each subsystem, and construct a multi-port network model of each subsystem according to the port parameters;
and the system integration module 30 is configured to integrate the multiport network models of the subsystems according to a preset port connection relationship to obtain a global network model.
And the modeling simulation module 40 is used for carrying out vehicle electromagnetic compatibility (EMC) simulation according to the global network model and obtaining a simulation result.
According to the embodiment, topological decomposition is carried out on an interference source and sensitive equipment in a vehicle system according to a coupling path to obtain a plurality of subsystems, port parameters of each subsystem are obtained, a multi-port network model of each subsystem is built according to the port parameters, the multi-port network models of each subsystem are integrated according to a preset port connection relation to obtain a global network model, vehicle electromagnetic compatibility (EMC) simulation is carried out according to the global network model, and a simulation result is obtained; compared with the prior art, the multi-port network modeling method has the advantages that the mutual influence of the coupling coefficients of the sub-system ports is guaranteed, the simulation time is shortened, the simulation speed is increased, and the vehicle development period is integrally reduced.
Further, the result decomposition module 10 is further configured to obtain coupling information of the coupling path; and carrying out topology decomposition on the interference source and the sensitive equipment in the vehicle system according to the coupling information to obtain a plurality of subsystems.
Further, the parameter obtaining module 20 is further configured to use a signal input port and a signal output port of an automobile component included in each subsystem as a subsystem port corresponding to the subsystem; determining a port coupling coefficient according to the electrical size of the subsystem port; determining a port excitation characteristic and a port load characteristic according to an electrical small size, wherein the electrical small size is an electrical small size inside a part of the interference source and/or an electrical small size inside a part of the sensitive equipment; and constructing a multi-port network model of each subsystem according to the port coupling coefficient, the port excitation characteristic and the port load characteristic.
Further, the parameter obtaining module 20 is further configured to construct black boxes of the multiport networks of the subsystems according to the port coupling coefficients; constructing equivalent circuits corresponding to the multi-port networks of the subsystems according to the port excitation characteristics and the port load characteristics; and constructing a multi-port network model of each subsystem according to the black boxes and the equivalent circuits.
Further, the system integration module 30 is further configured to obtain an impedance matrix corresponding to the multiport network model of each subsystem; integrating the impedance matrix according to a preset port connection relation to obtain a port coupling coefficient matrix of the global network; and constructing a global network model according to the port coupling coefficient matrix.
Further, the system integration module 30 is further configured to determine an interconnection port of the multi-port network model according to a preset port connection relationship; acquiring an interference source port corresponding to the interference source and a sensitive equipment port corresponding to the sensitive equipment; and integrating the impedance matrixes corresponding to the interconnection port, the interference source port and the sensitive equipment port according to the preset port connection relation to obtain a port coupling coefficient matrix of a global network model.
Further, the modeling simulation module 40 is further configured to perform vehicle electromagnetic compatibility (EMC) simulation according to the global network model, and obtain a matrix relationship between the sensitive device port and the interference source port; constructing a first selection matrix corresponding to the sensitive equipment and a second selection matrix corresponding to the interference source according to the matrix relation; constructing a voltage matrix and a current matrix corresponding to the multi-port network model according to the selection matrix corresponding to the interconnection port; determining a target voltage of the sensitive equipment port according to the port coupling coefficient matrix, the first selection matrix, the second selection matrix, the voltage matrix and the current matrix; and determining the sensitivity of the sensitive equipment to interference according to the target voltage, and obtaining a simulation result.
Furthermore, an embodiment of the present invention further provides a storage medium, where a vehicle electromagnetic compatibility simulation program is stored, and the vehicle electromagnetic compatibility simulation program implements the steps of the vehicle electromagnetic compatibility simulation method described above when executed by a processor.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in the embodiment may be referred to a vehicle electromagnetic compatibility simulation method provided by any embodiment of the present invention, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.
Through the description of the foregoing embodiments, it is clear to those skilled in the art that the method of the foregoing embodiments may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better implementation. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read Only Memory (ROM)/Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A vehicle electromagnetic compatibility simulation method, characterized in that the method comprises the steps of:
performing topology decomposition on an interference source and sensitive equipment in a vehicle system according to a coupling mode and coupling strength corresponding to a coupling path to obtain a plurality of subsystems;
acquiring port parameters of each subsystem, and constructing a multi-port network model of each subsystem according to the port parameters, wherein the port parameters comprise model parameters corresponding to each system port of a vehicle model or model parameters corresponding to parts, and parameters corresponding to port coupling coefficients, port excitation characteristics and port load characteristics of each subsystem in the vehicle system;
integrating the multi-port network models of all the subsystems according to the preset port connection relation to obtain a global network model;
and carrying out vehicle electromagnetic compatibility (EMC) simulation according to the global network model, and obtaining a simulation result.
2. The vehicle electromagnetic compatibility simulation method according to claim 1, wherein the step of obtaining port parameters of each subsystem and constructing a multiport network model of each subsystem according to the port parameters specifically comprises:
taking a signal input port and a signal output port of an automobile part contained in each subsystem as subsystem ports corresponding to the subsystems;
determining a port coupling coefficient according to the electrical size of the subsystem port;
determining a port excitation characteristic and a port load characteristic according to an electrical small size, wherein the electrical small size is an electrical small size inside a part of the interference source and/or an electrical small size inside a part of the sensitive equipment;
and constructing a multi-port network model of each subsystem according to the port coupling coefficient, the port excitation characteristic and the port load characteristic.
3. The vehicle electromagnetic compatibility simulation method according to claim 2, wherein the step of constructing a multi-port network model of each subsystem based on the port coupling coefficients, the port excitation characteristics, and the port load characteristics comprises:
constructing black boxes of the multi-port network of each subsystem according to the port coupling coefficients;
constructing equivalent circuits corresponding to the multi-port networks of the subsystems according to the port excitation characteristics and the port load characteristics;
and constructing a multi-port network model of each subsystem according to the black boxes and the equivalent circuits.
4. The vehicle electromagnetic compatibility simulation method according to claim 1, wherein the step of integrating the multiport network models of the subsystems according to the preset port connection relationship to obtain a global network model comprises:
acquiring an impedance matrix corresponding to the multi-port network model of each subsystem;
integrating the impedance matrix according to a preset port connection relation to obtain a port coupling coefficient matrix of the global network;
and constructing a global network model according to the port coupling coefficient matrix.
5. The vehicle electromagnetic compatibility simulation method according to claim 4, wherein the step of integrating the impedance matrix according to a preset port connection relationship to obtain a port coupling coefficient matrix of a global network specifically includes:
determining an interconnection port of the multi-port network model according to a preset port connection relation;
acquiring an interference source port corresponding to the interference source and a sensitive equipment port corresponding to the sensitive equipment;
and integrating the interconnection port, the interference source port and the impedance matrix corresponding to the sensitive equipment port according to the preset port connection relation to obtain a port coupling coefficient matrix of the global network model.
6. The vehicle electromagnetic compatibility simulation method according to claim 5 wherein said step of performing vehicle electromagnetic compatibility (EMC) simulation according to said global network model and obtaining a simulation result comprises:
performing vehicle electromagnetic compatibility (EMC) simulation according to the global network model, and acquiring a matrix relation between the sensitive equipment port and the interference source port;
constructing a first selection matrix corresponding to the sensitive equipment and a second selection matrix corresponding to the interference source according to the matrix relation;
constructing a voltage matrix and a current matrix corresponding to the multi-port network model according to the selected matrix corresponding to the interconnection port;
determining a target voltage of the sensitive equipment port according to the port coupling coefficient matrix, the first selection matrix, the second selection matrix, the voltage matrix and the current matrix;
and determining the sensitivity of the sensitive equipment to interference according to the target voltage, and obtaining a simulation result.
7. A vehicle electromagnetic compatibility simulation apparatus characterized by comprising: a memory, a processor and a vehicle electromagnetic compatibility simulation program stored on the memory and executable on the processor, the vehicle electromagnetic compatibility simulation program when executed by the processor implementing the steps of the vehicle electromagnetic compatibility simulation method of any of claims 1 to 6.
8. A storage medium, characterized in that the storage medium has stored thereon a vehicle electromagnetic compatibility simulation program that, when executed by a processor, implements the steps of the vehicle electromagnetic compatibility simulation method according to any one of claims 1 to 6.
9. A vehicle electromagnetic compatibility simulation apparatus, characterized in that the apparatus comprises:
the structure decomposition module is used for carrying out topology decomposition on an interference source and sensitive equipment in the vehicle system according to the coupling mode and the coupling strength corresponding to the coupling path to obtain a plurality of subsystems;
the system comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module is used for acquiring port parameters of each subsystem and constructing a multi-port network model of each subsystem according to the port parameters, and the port parameters comprise model parameters corresponding to each system port of a vehicle model or model parameters corresponding to parts and components, and parameters corresponding to port coupling coefficients, port excitation characteristics and port load characteristics of each subsystem in the vehicle system;
the system integration module is used for integrating the multi-port network models of all the subsystems according to the preset port connection relation to obtain a global network model;
and the modeling simulation module is used for carrying out vehicle electromagnetic compatibility (EMC) simulation according to the global network model and obtaining a simulation result.
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| CN112666408A (en) * | 2021-03-09 | 2021-04-16 | 中国电力科学研究院有限公司 | Method and system for detecting electromagnetic compatibility of submodule controller |
| CN113255061A (en) * | 2021-05-28 | 2021-08-13 | 中汽研（天津）汽车工程研究院有限公司 | Automobile electromagnetic compatibility low-voltage wire harness coupling simulation method |
| CN116029091B (en) * | 2022-11-21 | 2024-02-23 | 之江实验室 | Chip simulation method and device based on coherent transmission matrix method and computer equipment |
| CN116338367B (en) * | 2023-05-31 | 2023-08-15 | 广汽埃安新能源汽车股份有限公司 | Method and device for evaluating electromagnetic compatibility of whole vehicle |
| CN116954872B (en) * | 2023-09-20 | 2023-12-29 | 北京世冠金洋科技发展有限公司 | Global parameter calling method and device and readable storage medium |
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