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CN-122028399-A - Electromagnetic compatibility self-adaptive shielding system of electric automobile braking system

CN122028399ACN 122028399 ACN122028399 ACN 122028399ACN-122028399-A

Abstract

The invention relates to the technical field of vehicle braking control, in particular to an electromagnetic compatibility self-adaptive shielding system of an electric vehicle braking system, which comprises an electromagnetic environment sensing unit, an intelligent decision control unit of an electric vehicle device, a self-adaptive shielding execution unit, a signal filtering and purifying unit and a state feedback and diagnosis unit. According to the invention, through a flexible intelligent super-surface and active cancellation fusion architecture and a layered time-sharing frequency-division scheduling logic, microsecond electromagnetic impedance dynamic reconstruction and accurate composite shielding can be realized, so that the electromagnetic compatibility stability, anti-interference precision and operation safety of an electric automobile braking system are greatly improved, the full-flow intelligent protection of active self-adaptive shielding, real-time efficiency diagnosis and advanced trend early warning is realized, the transmission precision of braking sensing and control signals is effectively ensured, and the braking failure risk caused by electromagnetic interference is reduced.

Inventors

  • Shi Qinjian

Assignees

  • 洛坦电子科技(上海)有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (10)

  1. 1. The electromagnetic compatibility self-adaptive shielding system of the electric automobile braking system is characterized by comprising an electromagnetic environment sensing unit (100), an intelligent decision control unit (200) of an electric automobile device, a self-adaptive shielding execution unit (300), a signal filtering and purifying unit (400) and a state feedback and diagnosis unit (500), wherein: the electromagnetic environment sensing unit (100) is used for collecting the electromagnetic field intensity, frequency distribution and noise characteristics around and in the braking system in real time; The intelligent decision control unit (200) of the electric automobile device is used for identifying the characteristics of an interference source and threat level according to the perceived data, dynamically generating a matched shielding strategy, and respectively outputting the shielding strategy to the self-adaptive shielding execution unit (300) and the signal filtering purification unit (400); the self-adaptive shielding execution unit (300) is based on a flexible intelligent super-surface and active cancellation fusion framework, responds to a control instruction microsecond-level dynamic reconstruction electromagnetic impedance characteristic, and performs layering, time sharing and frequency division on braking electric control and wire harnesses; the signal filtering and purifying unit (400) is used for receiving a filtering parameter instruction of the intelligent decision control unit (200) of the electric automobile device and carrying out self-adaptive real-time filtering on key sensing and control signals of the braking system; The state feedback and diagnosis unit (500) is used for quantitatively evaluating the shielding effectiveness in real time through indexes of the signal-to-noise ratio rise and the bit error rate drop rate, automatically triggering the intelligent decision control unit (200) of the electric automobile device to perform strategy recalculation when the effectiveness is lower than a threshold value, and predicting the aging trend of the shielding layer and the deterioration trend of the electromagnetic environment based on historical data.
  2. 2. The electromagnetic compatibility adaptive shielding system of an electric vehicle braking system according to claim 1, wherein the electromagnetic environment sensing unit (100) comprises a multidimensional sensing array module (101), a time-frequency joint analysis module (102), and an interference source positioning module (103), wherein: The multi-dimensional sensing array module (101) is used for collecting original signals of electromagnetic field intensity, frequency components and noise time domain waveforms around and in the braking system in real time; the time-frequency joint analysis module (102) is used for carrying out time domain and frequency domain joint processing on the acquired signals and extracting noise characteristics and interference waveforms; The interference source positioning module (103) is used for calculating the spatial orientation and the relative distance of the interference source based on multi-sensor data fusion.
  3. 3. The electromagnetic compatibility adaptive shielding system of an electric vehicle braking system according to claim 1, wherein the electric vehicle device intelligent decision control unit (200) comprises an interference source feature identification module (201), a threat level evaluation module (202), a shielding strategy generation module (203), and an instruction distribution module (204), wherein: The interference source characteristic recognition module (201) is used for comparing the perception data with a built-in typical interference source characteristic library and recognizing the current interference source type; the threat level evaluation module (202) is used for quantitatively judging the threat level of the interference according to the interference intensity, the frequency band sensitivity and the working condition of the braking system; The shielding strategy generation module (203) is used for dynamically generating matched shielding parameter and filtering parameter instructions according to threat levels; The instruction distribution module (204) is used for outputting the shielding strategy instruction to the adaptive shielding execution unit (300) and outputting the filtering parameter instruction to the signal filtering purification unit (400).
  4. 4. The electromagnetic compatibility adaptive shielding system of an electric vehicle braking system according to claim 1, wherein the adaptive shielding execution unit (300) comprises a flexible intelligent super-surface module (301), an active interference cancellation module (302), and a layered time-division frequency-division shielding scheduling module (303), wherein: the flexible intelligent super-surface module (301) is used for reconstructing electromagnetic impedance and radiation characteristics according to a control instruction microsecond level; the active interference cancellation module (302) is configured to generate cancellation signals with equal amplitude and opposite phase to the interference signals; The hierarchical time-sharing frequency division shielding scheduling module (303) is used for executing differentiated shielding strategies on different shielding layers, different time periods and different frequency bands according to instruction requirements.
  5. 5. The electromagnetic compatibility adaptive shielding system of an electric vehicle braking system according to claim 4, wherein the flexible intelligent super-surface module (301) reconstructs electromagnetic impedance and radiation characteristics according to control command microsecond level, and specifically comprises the following operations: a1, receiving a control instruction output by an intelligent decision control unit (200) of the electric automobile device, wherein the control instruction comprises a target impedance parameter and a target radiation characteristic parameter; A2, analyzing the control instruction into bias voltage configuration parameters corresponding to each adjustable electromagnetic unit; A3, synchronously updating bias voltages of all the adjustable electromagnetic units in a single control period through a parallel driving circuit; and A4, switching electromagnetic states of the adjustable electromagnetic units in microsecond time to enable the whole super surface to achieve the target electromagnetic characteristic.
  6. 6. The electromagnetic compatibility adaptive shielding system of the electric automobile brake system according to claim 4, wherein the hierarchical time-sharing frequency-division shielding scheduling module (303) executes a differential shielding strategy for different shielding layers, different time periods and different frequency bands according to instruction requirements, and the specific operation is as follows: B1, analyzing a shielding instruction from an intelligent decision control unit (200) of the electric automobile device, extracting a shielding level index i and a time period window Target frequency band Target shielding strength ; B2, establishing a shielding level set according to the physical distribution of the electric control component of the braking system and the wire harness And assign priority weights to each hierarchy ; B3, constructing a space-time frequency three-dimensional scheduling activation function based on the extracted parameters ; Wherein the three-dimensional scheduling activation function Satisfies the formula (1): ; In the formula, Priority weight coefficient for the i-th shielding layer; Is a time window function, the current time t falls into a preset time window The value is 1 when the time is taken, otherwise, the value is 0; for the frequency band matching coefficient, the interference signal of the frequency f and the target frequency band are represented When the matching degree of (a) Is greater than a preset activation threshold Generating corresponding enabling signals to drive shielding nodes of corresponding levels in the adaptive shielding execution unit (300) to enter a working state; B4 according to Matching corresponding impedance reconstruction parameters from a pre-stored shielding pattern library, and issuing the parameters to a flexible intelligent super-surface module (301) and an active interference cancellation module (302) for execution.
  7. 7. The electromagnetic compatibility adaptive shielding system of an electric vehicle brake system according to claim 1, wherein the signal filtering and purifying unit (400) comprises an adaptive filtering parameter configuration module (401), a sensing signal filtering module (402), and a control signal shaping module (403), wherein: the self-adaptive filtering parameter configuration module (401) is used for receiving and analyzing the filtering parameters issued by the intelligent decision control unit (200) of the electric automobile device to complete the dynamic configuration of the filtering channel; The sensing signal filtering module (402) is used for carrying out real-time self-adaptive filtering and noise reduction on key sensing signals of braking pressure, rotating speed and displacement; The control signal shaping module (403) is used for filtering, clipping and waveform shaping the control output signal of the brake system.
  8. 8. The electromagnetic compatibility adaptive shielding system of an electric vehicle brake system according to claim 1, wherein the status feedback and diagnosis unit (500) comprises a shielding effectiveness evaluation module (501), an anomaly threshold judgment module (502), a fault early warning and trend prediction module (503), wherein: The shielding effectiveness evaluation module (501) is used for quantifying shielding and filtering effects in real time through indexes of signal-to-noise ratio improvement quantity and bit error rate reduction rate; The abnormal threshold judging module (502) is used for comparing the real-time efficiency with a preset threshold and judging whether the shielding system works normally or not; The fault early warning and trend predicting module (503) fits the aging trend of the shielding layer and the electromagnetic environment deterioration trend based on the historical data.
  9. 9. The adaptive shielding system for electromagnetic compatibility of an electric vehicle brake system according to claim 8, wherein the fault pre-warning and trend prediction module (503) fits a shielding layer aging trend and an electromagnetic environment deterioration trend based on historical data, and specifically comprises the following operations: c1, collecting and storing shielding effectiveness data, electromagnetic interference data and shielding layer operation duration data of a historical period, and constructing a standardized data set; C2, fitting the aging trend of the shielding layer by adopting an exponential decay model; C3, fitting the electromagnetic environment deterioration trend by adopting a linear regression model; C4 solving the time point when the predicted shielding effectiveness is lower than the preset effectiveness threshold Or predicting a point in time when the environmental interference intensity is higher than a preset interference threshold If (1) Or (b) And if the safety period is smaller than the preset safety period, triggering an early warning signal and reporting the early warning signal to an intelligent decision control unit (200) of the electric automobile device.
  10. 10. The adaptive shielding system for electromagnetic compatibility of an electric vehicle brake system according to claim 9, wherein the C2-C3 step involves the following expression: Fitting the aging trend of the shielding layer by adopting an exponential decay model shown in a formula (2): ; and fitting the electromagnetic environment deterioration trend by adopting a linear regression model shown in the formula (3): ; In the formula, Predicted shielding effectiveness for time t; Is the initial shielding effectiveness; for the ageing-decay factor, Is the ultimate shielding effectiveness, I (t) is the predicted environmental interference intensity at the moment t, For the initial interference strength to be sufficient, Is a deterioration rate coefficient.

Description

Electromagnetic compatibility self-adaptive shielding system of electric automobile braking system Technical Field The invention relates to the technical field of vehicle brake control, in particular to an electromagnetic compatibility self-adaptive shielding system of an electric automobile brake system. Background The electric automobile is a vehicle which uses a vehicle-mounted chargeable energy storage device (such as a power battery) as a core power source and runs by means of driving wheels of a motor, meets various requirements of road traffic and safety regulations, is different from the traditional fuel automobile, mainly comprises the types of pure electric automobile, hybrid electric automobile, fuel cell electric automobile and the like, and is also a main stream category of the current new energy automobile. The electric automobile braking system is a core execution component for guaranteeing the running safety of the electric automobile, in particular to a whole set of device and a control system for the fit of the electric automobile, realizing the speed reduction, parking braking and emergency braking of the electric automobile, not only has the basic braking function of the traditional automobile braking system, but also integrates the electric and intelligent characteristics, gives consideration to the special functions of braking energy recovery, electric control cooperative control and the like, and accurately controls the speed of the automobile and realizes reliable parking in various modes such as mechanical braking, hydraulic/pneumatic braking, electric braking and the like. Meanwhile, the electric automobile is provided with the high-voltage control module, the driving motor and the dense wire harness, the electromagnetic environment of the whole automobile is more complex than that of a traditional fuel oil automobile, various electromagnetic interferences are very easy to attack a sensing link and a control loop of a braking system, and the transmission precision and the control stability of braking signals are extremely threatened, so that the electromagnetic compatibility protection of the braking system becomes a key link for guaranteeing the driving safety. In the prior art, the electromagnetic shielding mode of the traditional electric automobile braking system mostly adopts a fixed shielding structure or a single filtering means, has the defects of poor adaptability, low shielding precision, lack of real-time efficiency feedback and aging early warning mechanism, is difficult to adapt to a dynamically-changed vehicle-mounted electromagnetic environment, is extremely easy to cause braking sensing and control signal distortion due to electromagnetic interference, further causes potential safety hazards such as braking failure, braking retardation and the like, and seriously influences the running safety and reliability of the electric automobile. Based on the above, the invention provides an electromagnetic compatibility self-adaptive shielding system of an electric automobile braking system, so as to solve the technical problems. Disclosure of Invention The invention aims to provide an electromagnetic compatibility self-adaptive shielding system of an electric automobile braking system, which can realize microsecond electromagnetic impedance dynamic reconstruction and accurate composite shielding through a flexible intelligent super-surface and active cancellation fusion framework and a layered time-sharing frequency-division scheduling logic, and can precisely predict the aging trend and the electromagnetic environment deterioration trend of a shielding layer through real-time quantification shielding filtering efficiency and closed-loop triggering strategy optimization, thereby greatly improving the electromagnetic compatibility stability, anti-interference precision and operation safety of the electric automobile braking system, realizing the full-flow intelligent protection of active self-adaptive shielding, real-time efficiency diagnosis and advanced trend early warning, effectively guaranteeing the transmission precision of braking sensing and control signals, and reducing the braking failure risk caused by electromagnetic interference. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides an electromagnetic compatibility self-adaptive shielding system of an electric automobile braking system, the system comprises an electromagnetic environment sensing unit, an intelligent decision control unit of an electric automobile device, a self-adaptive shielding execution unit, a signal filtering and purifying unit and a state feedback and diagnosis unit, wherein: the electromagnetic environment sensing unit is used for collecting electromagnetic field intensity, frequency distribution and noise characteristics around and inside the braking system in real time; the intelligent decision control unit of the