CN-121980787-A - Method and device for evaluating arrangement strategy of high-low voltage wire harness

CN121980787ACN 121980787 ACN121980787 ACN 121980787ACN-121980787-A

Abstract

The application discloses a method and a device for evaluating an arrangement strategy of high-low voltage wire harnesses, and belongs to the technical field of vehicle wire harness design. The arrangement strategy evaluation method comprises the steps of constructing frequency domain coupling models of a high-voltage wire harness and a low-voltage wire harness to generate an arrangement strategy, extracting a scattering parameter matrix according to the frequency domain coupling models, enabling the scattering parameter matrix to represent coupling path transmission characteristics, carrying out coupling attenuation simulation according to the scattering parameter matrix to obtain coupling attenuation data, determining coupling risks according to the coupling attenuation data, adjusting the arrangement strategy of the frequency domain coupling models to carry out iterative optimization on the coupling attenuation data under the condition that the coupling risks are higher than a preset risk threshold, and outputting the current arrangement strategy under the condition that the coupling risks are lower than the preset risk threshold. The coupling attenuation data are obtained by constructing a frequency domain coupling model and extracting a scattering parameter matrix to quantify the coupling path characteristics, so that the accurate analysis of the coupling characteristics is realized, the risk is prejudged in the early stage of design, and the later stage of rectification is avoided.

Inventors

MA QINQIN
WANG QIWEN
LOU XUHUA
ZHOU HONGTAO

Assignees

浙江凌艾未来科技有限公司
浙江零跑科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260121

Claims (10)

1. An arrangement policy evaluation method of a high-low voltage wire harness, characterized by comprising the steps of: constructing a frequency domain coupling model of the high-voltage wire harness and the low-voltage wire harness to generate an arrangement strategy; extracting a scattering parameter matrix according to the frequency domain coupling model, wherein the scattering parameter matrix characterizes the transmission characteristic of a coupling path; performing coupling attenuation simulation according to the scattering parameter matrix to obtain coupling attenuation data; Determining a coupling risk according to the coupling attenuation data; Under the condition that the coupling risk is higher than a preset risk threshold, adjusting an arrangement strategy of the frequency domain coupling model so as to iteratively optimize the coupling attenuation data; and outputting the current arrangement strategy under the condition that the coupling risk is lower than a preset risk threshold value.
2. The arrangement policy evaluation method according to claim 1, wherein the step of constructing a frequency domain coupling model of the high voltage harness and the low voltage harness includes: constructing a parameterized structural model according to geometric parameters and electrical parameters of the high-voltage wire harness and the low-voltage wire harness, wherein the geometric parameters comprise at least one of wire harness spacing, parallel length, wire diameter and shielding layer thickness; and establishing the frequency domain coupling model according to the parameterized structural model.
3. The placement strategy evaluation method according to claim 2, wherein the frequency domain coupling model comprises a transmission line model, a three-dimensional full wave simulation model, and a circuit port model; The step of establishing the frequency domain coupling model according to the parameterized structural model comprises the following steps: dividing a key frequency range on the parameterized structural model based on the transmission line model; Constructing a metal reference plane based on a three-dimensional full-wave simulation model to simulate a vehicle body metal structure where the high-voltage wire harness and the low-voltage wire harness are located; Setting a boundary condition on the metal reference plane; dividing the parameterized structural model and the metal reference plane into grid structures; port information of the high voltage harness and the low voltage harness is defined based on the circuit port model.
4. The placement strategy evaluation method according to claim 3, wherein the step of extracting a scattering parameter matrix from the frequency domain coupling model comprises: And injecting electromagnetic signals in the key frequency range into the injection port of the high-voltage wire harness, and calculating signal responses of each port of the high-voltage wire harness and each port of the low-voltage wire harness based on full-frequency-band sweep frequency simulation to obtain a scattering parameter matrix.
5. The deployment strategy evaluation method of claim 4, wherein performing a coupling attenuation simulation based on the scattering parameter matrix, the step of obtaining coupling attenuation data comprises: and carrying out coupling attenuation simulation based on a coupling attenuation formula according to the scattering parameter matrix to obtain coupling attenuation data.
6. The placement strategy evaluation method of claim 5, wherein the coupling attenuation data comprises near-end coupling attenuation data and far-end coupling attenuation data; performing coupling attenuation simulation based on a near-end coupling attenuation formula according to the scattering parameter matrix to obtain near-end coupling attenuation data, wherein the near-end coupling attenuation data are used for representing coupling characteristics of an injection port of the high-voltage wire harness and a near-end port of the low-voltage wire harness; And performing coupling attenuation simulation based on a far-end coupling attenuation formula according to the scattering parameter matrix to obtain far-end coupling attenuation data, wherein the far-end coupling attenuation data are used for representing coupling characteristics of an injection port of the high-voltage wire harness and a far-end port of the low-voltage wire harness.
7. The placement policy evaluation method of claim 1, wherein determining a coupling risk from the coupling attenuation data comprises: and comparing the coupling attenuation data with a standard limit value in real time, calculating a difference value between the coupling attenuation data and the standard limit value, and dividing the coupling risk according to the difference value.
8. The arrangement policy evaluation method according to claim 1, characterized in that before the step of constructing the frequency domain coupling model of the high-voltage wire harness and the low-voltage wire harness, the arrangement policy evaluation method further comprises: And preliminarily determining the coupling risk of the high-voltage wire harness and the low-voltage wire harness according to a design rule base, wherein the design rule base comprises a coupling relation matrix table of the high-voltage wire harness and the low-voltage wire harness and is used for storing the arrangement strategy and the corresponding coupling risk of the high-voltage wire harness.
9. The placement policy evaluation method according to claim 8, wherein after the step of determining a coupling risk from the coupling attenuation data, the placement policy evaluation method further comprises: And storing the arrangement strategy of the high-low voltage wire harness and the corresponding coupling risk in the design rule library.
10. An arrangement policy evaluation device of a high-low voltage wire harness, characterized by comprising: the model construction module is used for constructing a frequency domain coupling model of the high-voltage wire harness and the low-voltage wire harness so as to generate an arrangement strategy; the parameter extraction module is used for extracting a scattering parameter matrix according to the frequency domain coupling model, and the scattering parameter matrix characterizes the transmission characteristic of the coupling path; the coupling attenuation simulation module is used for performing coupling attenuation simulation according to the scattering parameter matrix to obtain coupling attenuation data; The risk judging module is used for determining coupling risk according to the coupling attenuation data, adjusting the arrangement strategy of the frequency domain coupling model to perform iterative optimization on the coupling attenuation data under the condition that the coupling risk is higher than a preset risk threshold, and outputting the current arrangement strategy under the condition that the coupling risk is lower than the preset risk threshold.

Description

Method and device for evaluating arrangement strategy of high-low voltage wire harness Technical Field The application relates to the technical field of vehicle wire harness design, in particular to a method and a device for evaluating an arrangement strategy of high-low voltage wire harnesses. Background Along with the rapid development of electrification and intelligence of the vehicle, the complexity of the whole vehicle wiring harness system is remarkably improved. In particular the evolution of high voltage systems from 400V to 800V and even higher voltage levels, has led to a drastic increase in the risk of electromagnetic interference. High-frequency noise during operation of the high-voltage wire harness is possibly coupled to the low-voltage wire harness through conduction or radiation, so that the signal-to-noise ratio of sensitive signals is deteriorated, misoperation of a system or exceeding of radiation emission is caused, the performance of the whole vehicle is directly affected, and therefore coupling interference of the high-voltage wire harness and the low-voltage wire harness is a factor to be analyzed during design of the vehicle. In the related technology, a whole vehicle electromagnetic model, a high-low voltage beam model or a high-voltage electrical equipment three-dimensional model is built, boundary conditions and excitation are added, transmission parameters are solved, and then risk is judged or test suggestions are given based on coupling voltage or current. However, the mode needs to rely on a physical model of the whole vehicle or accurate circuit data support, so that the coupling interference detection of the high-low voltage wire harness is relatively delayed, and the risk prediction requirement of the arrangement strategy of the high-low voltage wire harness in the early design stage is difficult to meet. Disclosure of Invention The embodiment of the application provides a method and a device for evaluating a layout strategy of a high-low voltage wire harness, and aims to solve the problem that the layout strategy of the high-low voltage wire harness is difficult to meet the risk pre-judging requirement in the early design stage in the related technology. In a first aspect, an embodiment of the present application provides a method for evaluating an arrangement policy of a high-low voltage wire harness, the arrangement policy evaluation method including the steps of: constructing a frequency domain coupling model of the high-voltage wire harness and the low-voltage wire harness to generate an arrangement strategy; Extracting a scattering parameter matrix according to the frequency domain coupling model, wherein the scattering parameter matrix characterizes the transmission characteristic of the coupling path; Performing coupling attenuation simulation according to the scattering parameter matrix to obtain coupling attenuation data; Determining a coupling risk according to the coupling attenuation data; Under the condition that the coupling risk is higher than a preset risk threshold, adjusting an arrangement strategy of the frequency domain coupling model to iteratively optimize the coupling attenuation data; and outputting the current arrangement strategy under the condition that the coupling risk is lower than a preset risk threshold value. In some embodiments, the step of constructing a frequency domain coupling model of the high voltage harness and the low voltage harness comprises: constructing a parameterized structural model according to geometric parameters and electrical parameters of the high-voltage wire harness and the low-voltage wire harness, wherein the geometric parameters comprise at least one of wire harness spacing, parallel length, wire diameter and shielding layer thickness; and establishing a frequency domain coupling model according to the parameterized structural model. In some embodiments, the frequency domain coupling model includes a transmission line model, a three-dimensional full wave simulation model, and a circuit port model; the step of establishing a frequency domain coupling model from the parameterized structural model includes: Dividing a key frequency range on a parameterized structural model based on a transmission line model; constructing a metal reference plane based on a three-dimensional full-wave simulation model to simulate a vehicle body metal structure where a high-voltage wire harness and a low-voltage wire harness are located; setting boundary conditions on a metal reference plane; dividing a parameterized structure model and a metal reference plane into grid structures; port information for the high voltage harness and the low voltage harness is defined based on the circuit port model. In some embodiments, the step of extracting the scattering parameter matrix from the frequency domain coupling model comprises: Electromagnetic signals in a key frequency range are injected into an injection port of the high-voltage wire harne