929 results about "Automotive electronics" patented technology

The invention discloses a vehicle exterior handle waterproof false triggering system and method based on double-frequency-point charging and discharging resonance, and relates to the technical field of automotive electronics. An electrode array composed of capacitance detection electrodes is arranged on the inner side of a vehicle exterior handle to form a vehicle exterior handle capacitance sensor; in a non-interference environment, high-frequency and low-frequency mutual capacitance reference values are collected, and a compensation parameter library is established by associating outer handle shell parameters of the vehicle; a self-capacitance channel of the electrode array is used for detecting proximity signals, high-frequency and low-frequency mutual capacitance signals are collected, and the high-frequency and low-frequency mutual capacitance signals are preprocessed; calling a compensation parameter library to correct the preprocessed high and low frequency mutual capacitance signal, and calculating the mutual capacitance increment and change slope of the high and low frequency mutual capacitance signal; based on the mutual capacitance increment and the change slope, human body touch and water interference are distinguished by analyzing high-frequency and low-frequency signals.

The embodiment of the invention discloses an automobile power-assisted steering test system and method, and relates to the technical field of automobile electronics. An EPS controller in the automobile power-assisted steering test system is used for acquiring an input torque generated by a driver simulation motor through an angle torque sensor; according to the input torque and the state information of the vehicle, the power-assisted torque needing to be output by the EPS motor in the steering process is determined; the power-assisted torque is sent to an EPS motor, so that the EPS motor assists the vehicle in steering; if the input torque, the power-assisted torque and the actual resistance torque of the rocker arm end are balanced in the steering process of the vehicle, and the amplitude and the variation trend of the power-assisted torque all accord with the preset power-assisted characteristic curve, the vehicle power-assisted steering test passes. Therefore, by introducing a driver steering wheel input part and a steering resistance simulation part, the automobile power-assisted steering test system can simulate the working principle of a steering system more truly, so that the test precision and effect are improved.

The invention relates to the field of task queue scheduling of automobile chips, in particular to a test case dynamic priority scheduling method for automobile electronic chips. Comprising the following steps: analyzing standard test data of the automobile electronic chip, and organizing a structured data set associated with the physical layout of the chip; identifying failure clusters and noise points on the structured data set by using a data clustering algorithm; extracting geometric and position features of the failure cluster, classifying the failure cluster into a known failure mode by using a classifier, performing correlation analysis on the failure mode, an upstream key process step and an equipment log, and establishing a causal relationship; calculating a function security risk score for each chip; and when the function security risk score is higher than a preset risk threshold value, generating and executing a dynamic task rearrangement instruction, and dynamically improving the execution priority of the test case. According to the method, the priority is dynamically selected according to the function security risk score through the dynamic task rearrangement instruction, so that the test time is saved, and the coverage depth and quality of the test are improved.

The invention relates to an FOC control method based on an automobile air conditioner module motor without a Hall sensor, and belongs to the technical field of automobile electronics. The method comprises the following steps: injecting double-frequency voltage pulses into a stator in stages to position a rotor; collecting current through a sampling resistor and filtering to construct a rotor flux linkage distribution model, and presetting rectangular axis current in combination with noise reduction of a miniature acoustic sensor and air speed gear of an air conditioner; an extended Kalman filter observer is adopted to reversely deduce the load torque, and the torque change rate is monitored to trigger instantaneous load impact protection; the voltage space vector amplitude is corrected through voltage feed-forward compensation, a resistor-capacitor series filter circuit is additionally arranged, and phase dislocation pulse width modulation is adopted for resisting interference; and establishing a motor efficiency-rotating speed-load three-dimensional optimization method, starting dynamic flux-weakening control, and estimating the winding temperature through the stator resistance to adjust the flux-weakening depth. Accurate starting and dynamic load adaptation of the Hall-sensor-free motor are achieved, starting out-of-step and noise exceeding are avoided, and stable air volume of an automobile air conditioner and long-term reliable operation of the motor are guaranteed.

The invention discloses an automobile electronic wire harness insulation sheath crack detection system based on computer vision, and the system comprises a multi-channel input module which is used for obtaining and preprocessing multi-channel original data frames; the double-domain feature extraction module is used for extracting a double-domain feature pyramid; the double-domain fusion module is used for executing cross-domain attention and mutual information consistent weighting and inhibiting mirror surface highlight pseudo response; the topological structure output module is used for outputting a preliminary crack structuring result through the multi-head crack structure prediction head set; the communication repair module is used for carrying out breakpoint bridging and conflict rollback on the preliminary crack structuring result; and the geometric measurement module is used for measuring crack data and forming a structured detection report. According to the method, polarization reflection suppression and flattening geometric modeling are fused, a double-domain crack detection network is constructed, accurate identification and quantitative measurement of sheath cracks are achieved, and the method has the advantages of being high in reflection resistance, stable in topology and traceable in result.

The invention belongs to the field of automobile electronic control, and provides an automobile part full-angle hovering control method and system and an automobile. The control method comprises the steps that the opening position of an automobile part is obtained, and the automobile part is an automobile door or an engine hood; determining a target motor torque of a support rod internal motor of a support rod group of the automobile part according to the opening position of the automobile part; wherein the supporting rod group comprises more than one supporting rod, and no damper is arranged in the supporting rod; calculating a target torque current of the motor in the stay bar based on the target motor torque; and according to the target torque current, a current loop closed-loop control mode is adopted to control the output torque of a motor in the supporting rod, so that hovering of the automobile part at the opening position of the automobile part is achieved. The invention further discloses an automobile part full-angle hovering control device, an automobile part control system and an automobile. According to the invention, rapid and accurate torque control of the motor in the stay bar is realized, and all-angle hovering of components under electronic control is realized.

The invention belongs to the technical field of automobile electronic safety, and particularly relates to an automobile keyless entry and start integrated system based on Bluetooth recognition, which comprises an awakening module, a connection management module, an entry authorization module, a start authorization module and a safety audit module, and is used for awakening an application scene switched to an active authentication mode based on a sleep mode. The problem of continuous high-power-consumption operation of Bluetooth is avoided, meanwhile, quick response is ensured when a user approaches a vehicle, and progressive protection for a Bluetooth recognition scene is formed through multiple security links of physical proximity verification and bidirectional encryption authentication. A vehicle entering authorization instruction is sequentially generated and sent to a vehicle body domain controller, and a vehicle starting authorization instruction is sequentially generated and sent to a vehicle power supply management unit, so that the convenience of Bluetooth keyless entry is reserved, the balance between non-inductive operation and absolute safety is realized, and closed-loop optimization is executed in combination with complete authentication failure auditing, so that the system has a self-iteration capability.

The invention provides a cooperative control method and device for low-voltage power consumption of a whole vehicle and electronic equipment, and relates to the technical field of automotive electronics, and the method comprises the steps: obtaining multi-modal original data (including vehicle state information, environment information and user behavior information), and carrying out the preprocessing; performing feature extraction and fusion processing on the preprocessed multi-modal original data to generate a high-level semantic event used for representing the vehicle leaving intention of the user or the parking scene; matching a global power consumption management strategy of a high-level semantic event through a hierarchical finite-state machine model; and according to the global power consumption management strategy, executing hierarchical power supply control on the low-voltage electricity load of the whole vehicle, and in the hierarchical power supply control process, dynamically adjusting control parameters in the global power consumption management strategy based on a comparison result of the actual power consumption monitoring data and a preset baseline model. Depth power shortage of the storage battery caused by redundant power consumption is effectively avoided, the risks that the vehicle cannot be started and equipment is abnormal are reduced, and the reliability of the whole vehicle and the user experience are improved.

The invention relates to the field of automobile electronic testing technology and equipment, and discloses a vehicle-mounted camera imaging quality testing method and device suitable for a rain and fog scene, and the method comprises the steps: installing a to-be-tested camera module in a rain and fog environment cabin, setting the spectrum and illumination of a top natural illumination simulation system, and simulating the illumination at different time periods; selecting a test target plate in the darkroom; starting an automatic centering module to align the optical axis with the standard plate reference; rain and fog parameters are set through the environment control host, the rain and fog supply system is started to simulate different levels of rain and fog environments, and the raindrop particle size, concentration, dripping speed, fog visibility and fogdrop particle size are dynamically regulated and controlled; shooting a target plate graph card, extracting characteristic parameters by an image analysis module, performing quantitative analysis, and generating an evaluation report, so as to solve the technical problem of singleness of rain and fog scene environment simulation in the prior art.

The invention discloses a hardware-in-the-loop test method and device and electronic equipment, relates to the technical field of automotive electronics, and adopts a simulated annealing algorithm in an optimization stage, adjusts parameters according to characteristics of an electronic stability control system, optimizes data distribution, and improves test data quality and fault detection capability. In the verification stage, the generated test data is subjected to actual operation test, the data problem is fed back by comparing actual output with an expected result, and the optimized test data which does not pass verification is sent to the target hardware-in-loop test model for optimization adjustment, so that a closed-loop optimization verification process is formed. The iterative closed-loop process comprehensively covers all possible working conditions and fault modes, key test points are prevented from being omitted, the reliability of the electronic stability control system is enhanced, the accuracy, effectiveness, comprehensiveness and sufficiency of hardware-in-the-loop test of the electronic stability control system are ensured, and the reliability of the electronic stability control system is improved. And the limitation of hardware-in-the-loop test of the electronic stability control system is reduced.

The invention belongs to the technical field of automobile electronic manufacturing / chip burning, relates to an automobile PMIC chip burner, a burner system and a burning method, and aims to solve the problems of high system complexity and cost, low burning efficiency, insufficient reliability, insufficient safety, low production line automation degree and the like in the existing chip burning technology. The whole burning process is directly coordinated / controlled through the main control unit, an intermediate conversion link is eliminated, and the system complexity and the equipment cost are reduced; instruction conversion is carried out through the interface conversion module so as to be compatible with various types of chips; the power supply management module adopts dual-power input, the target connection interface ensures reliable physical electrical connection with the PMIC chip, the state indication module feeds back the burning state and error information in real time, and the man-machine interaction experience is improved. The device universality and the automation degree of a production line are remarkably improved, cost is low, compatibility is high, burning efficiency is high, the device is suitable for a burning system deployed on site, and the harsh requirement for zero defect of the vehicle gauge level is met.

The invention relates to the crossing field of an artificial intelligence technology and an automotive electronic technology, and discloses a voice interaction question answering method and system based on a vehicle-mounted large model knowledge base, and the method comprises the following steps: receiving a user query text, and executing intention recognition and structured analysis; based on an analysis result, constructing and executing a mixed retrieval request including structured filtering, full-text keyword retrieval and semantic vector retrieval; fusing and reordering the plurality of retrieval result sets obtained respectively to obtain a high-quality final retrieval result set; and finally, constructing a context based on the final retrieval result set and a user query text, and calling a large language model to generate and output a final answer. By introducing a hybrid retrieval and fusion reordering mechanism, comprehensive context information is provided for a large language model, the accuracy and reliability of questions and answers are improved, and the ability of a system to understand and process complex fuzzy queries is enhanced.

The invention discloses a carbon fiber-glass bead synergistically reinforced PA56 / PPO composite material and a preparation method thereof, and relates to the technical field of high polymer materials. The PA56 / PPO composite material comprises the following components in percentage by mass: 20%-40% of PA56 resin, 20%-30% of PPO resin, 20%-40% of modified carbon fibers, 10%-20% of silane modified glass beads, 0.5%-5% of a toughening agent and 0.5%-5% of a compatilizer. Through compound use of the modified carbon fibers and the silane modified glass beads, the addition amount of a single carbon fiber material can be reduced, and weight reduction is realized while the cost is reduced; the toughening agent has good compatibility with matrix resin and can generate a better toughness modification effect after being added into a PA56 / PPO system, and the added compatilizer can improve the interfacial effect among the components so as to effectively improve the mechanical properties and antistatic properties of the composite material. The carbon fiber-glass bead synergistically reinforced PA56 / PPO composite material provided by the invention is balanced in rigidity, toughness and antistatic property, and can be used in automotive electronic and electrical products with requirements on high strength, high toughness and antistatic property.

The invention relates to the technical field of automobile electronics and intelligent control, and discloses an intelligent cabin mechanical arm system which comprises a folding mechanical arm body, a tail end sensing interaction module, a driver state monitoring subsystem and a central control unit which are installed in a cabin. The central control unit controls the storage or working mode of the mechanical arm according to the comprehensive fatigue index of the driver; in the working mode, visual gazing information is used as a gating signal to activate electroencephalogram analysis, the operation intention is confirmed in combination with the visual prior probability and electroencephalogram signals, and the mechanical arm impedance parameters are adjusted in real time based on the fatigue state. According to the method, through Bayesian fusion of vision and electroencephalogram signals, the problem that single-mode control is unstable is solved; by means of variable impedance control and collision detection of the momentum observer, active safety protection based on the physiological state of the driver is achieved, and non-sensitive and high-safety intelligent auxiliary experience is provided in a limited cabin space.

The invention relates to the technical field of injection mold bases, in particular to a multi-cavity efficient injection mold base for automobile electronic products. Comprising a support, an injection molding feeding pipe is fixedly installed on the support, the fixed mold base is rotationally connected to the support, four upper molds are rotationally connected to the fixed mold base, each upper mold is rotationally communicated with the injection molding feeding pipe, a positioning motor in transmission connection with the fixed mold base is arranged on the support, and a lifting frame is arranged on the support in a lifting mode. The lifting frame is rotationally connected with a discharging rotating frame, the discharging rotating frame is rotationally connected with an overturning frame, the overturning frame is rotationally connected with a movable mold base, and the movable mold base is rotationally connected with four lower molds. The circulating type variable-angle reciprocating injection mold has the beneficial effects that the movable mold base and the lower mold are driven by the transmission mechanism to achieve circulating type variable-angle reciprocating rotation, and the limitation of static filling of a traditional fixed mold cavity is broken through by combining the synchronous linkage design of the fixed mold base and the upper mold and utilizing the centrifugal force and the periodic extrusion effect.

The invention relates to automobile electronic component assembling and carrying equipment. The device is composed of a supporting mechanism, a feeding mechanism, a material dispersing mechanism, a vibration feeding machine and a feeding safety mechanism. The hopper lifts the capacitor shell to the conveying pipe through the conveying belt and the material plate; after being limited, the baffle enters the vibration feeding machine through the discharging pipe; the angle of the guide plate is adjusted through linkage of a threaded rod, a two-way rack rod and a second gear, and the drop point range can be adjusted in cooperation with a conical material scattering rod. The vibration feeding machine completes sorting and is guided out through the extending discharging plate; during feeding, the cover plate drives the eccentric bolt, the sliding rod, the swing cylinder and the swing plate through the first gear and the fluted disc, so that the I-shaped sliding sleeve enables the second coupler to be disengaged from the first coupler, and driving of the conveying belt is stopped; after closing, meshing is performed under the action of the spring; the device gives consideration to both low-material-level rapid feeding and high-material-level stable material storage, the feeding consistency is improved, and the operation safety is enhanced.

An automotive electronic intrusion determination method, apparatus and device based on multi-source fusion data, and a storage medium, the method comprising: performing filtering processing and fusion processing on obtained CAN bus data, vehicle-mounted entertainment system data, Internet of Vehicles data and vehicle state data to generate multi-dimensional feature vector data; marking a corresponding early warning level for the multi-dimensional feature vector data to generate a multi-source fusion data set; training a preset neural network based on the multi-source fusion data set to generate an automobile electronic intrusion detection model; and based on the automobile electronic intrusion detection model, according to the obtained target CAN bus data, target vehicle-mounted entertainment system data, target Internet of Vehicles data and / or target vehicle state data, obtaining an early warning level output by the automobile electronic intrusion detection model so as to determine whether the current vehicle is invaded or not. The technical problems that the false alarm rate is high and complex attacks are difficult to recognize due to the fact that an automobile electronic intrusion detection system depends on a single data source are solved.

The invention relates to the technical field of functional coatings, in particular to an environment-friendly water-based strippable coating and a preparation method thereof.The environment-friendly water-based strippable coating is prepared from, by mass, 25%-45% of film-forming resin, 8%-20% of a stripping functional component, 10%-25% of a filler system, 3%-8% of a functional additive and the balance water, the stripping functional component is a ternary system of a wax emulsion, organic silicon modified acrylate and a fluorocarbon modified polymer, through collaborative design of the components, controllable stripping, no residue and no damage of a coating on various base materials such as metal, plastic and glass are achieved, meanwhile, the coating has excellent water resistance, weather resistance and environmental protection performance, and the coating can be widely applied to various substrates such as metal, plastic, glass and the like. The method is suitable for temporary protection in the fields of automobiles, electronics, precise instruments and the like.

The invention provides a domestic chip-oriented lightweight AUTOSAR architecture multi-core optimization method, belongs to the field of automobile electronic software architecture optimization, and is used for solving the problems of low computing power utilization rate, insufficient security isolation and long multi-vehicle-type adaptation period when an AUTOSAR architecture adapts to a domestic multi-core chip in related technologies. According to the method, core resource characteristics of the domestic multi-core chip are quantified, a three-dimensional binding partition deployment system is constructed, functional partitions are split, core resources are bound directionally, OS lightweight, security isolation, dynamic scheduling, self-adaptive learning and pruning feedback are combined, security task physical isolation is achieved, the hardware characteristics of the domestic chip are adapted, the efficiency of the multi-core resources is improved, and the cost is reduced. And the multi-vehicle-type adaptation period is shortened.

The invention provides a system and method for embedding a virtual CAN channel and a computer readable storage medium, and is applied to the technical field of automotive electronics. According to the invention, a plurality of heterogeneous processor cores for respectively running independent automobile open system architecture classical platform examples are deployed on the same SoC chip, an inter-core communication module comprising a shared memory and a hardware mailbox and a virtual CAN driving module are constructed, and the protocol conversion unit is utilized to realize the inter-conversion of IPC and CAN messages. A hardware mailbox function is simulated through the virtual mailbox manager, the state of the controller is managed in combination with the state machine, a cross-core communication protocol is unified, the integration cost is reduced while the compatibility of an automobile open system architecture classical platform is kept, and the high-reliability and high-performance communication requirements of an intelligent cabin are met.

The invention provides a heat management method and device for a new energy automobile, the new energy automobile, electronic equipment and a storage medium, and the method comprises the steps: obtaining input data; performing feature extraction on the temperature time sequence data sequence, the energy consumption information and the external environment state vector sequence to obtain a multi-modal feature set; performing feature fusion of a graph attention mechanism model on the multi-modal feature set to obtain a fused feature set; inputting the fusion feature set into a pre-constructed reinforcement learning controller for thermal management control strategy prediction, and obtaining a predicted thermal management control parameter output vector; optimizing a pre-constructed control strategy network according to the input data and the thermal management control parameter output vector to obtain a thermal management control model; and inputting test data into the thermal management control model to obtain a prediction result. According to the vehicle thermal management method and device, multi-mode information is fully fused, intelligent and dynamic thermal management of the vehicle is achieved, and the thermal management efficiency and the control capability are improved.

The invention belongs to the technical field of automobile electronics, and particularly relates to a tire pressure monitoring dynamic calibration method and system fused with vehicle speed data, and the method comprises the steps: obtaining real-time tire pressure, tire temperature, vehicle speed and environment temperature; based on the vehicle speed, the environment temperature and the calibration parameters, the tire theoretical temperature is estimated through a dynamic thermodynamic model; the real-time tire temperature and the theoretical temperature are fused through Kalman filtering, and the corrected internal temperature is obtained; and according to the real-time tire pressure, the corrected internal temperature and the cold tire reference temperature, a cold tire pressure equivalent value is calculated to judge the tire pressure state. By the adoption of the technical scheme, the interpretation ambiguity of traditional tire pressure monitoring can be overcome, the cold tire pressure equivalent value with more guiding significance is provided, and the accuracy, robustness and self-adaptive learning capacity of the system are enhanced.

The invention discloses an automobile software upgrading processing method and device, a storage medium and electronic equipment, and relates to the technical field of automobile electronics. The target upgrading software package is written into the partition obtained through the preset partition mode to be upgraded, part of software is precisely upgraded in a targeted mode, and therefore dynamic upgrading of the automobile software is achieved. The system partition and the application program partition form a double-partition design, only software in one partition is upgraded, in the process of running software in a new partition after upgrading, if the conditions that the software cannot be started or running is abnormal after starting and the like occur, the software in an old partition can be switched to run, the condition that the software cannot be started due to upgrading is avoided, and the software upgrading efficiency is improved. And the situation that the system cannot work normally when the whole firmware upgrading scheme fails to upgrade is avoided, so that the stability and the reliability of the system are improved.

The invention relates to the field of automobile electronic control, in particular to a running state monitoring method for a vehicle motor controller, which comprises the following steps: S0, determining a key running signal needing to be continuously monitored; the communication format of the key operation signal on a vehicle-mounted CAN bus is defined; the method comprises the following steps: S1, constructing and deploying an embedded operation event recording system in a motor controller; s2, after the motor controller is powered on and runs, the embedded running event recording system constructed in the S1 is started, and recording of the running event is completed; s3, continuously monitoring and accumulating the power-off dormancy times of the motor controller through the storage aging management module; and executing an erasing operation on the special storage block. According to the method, reliable storage and on-demand return of key event data can be realized on the premise of not depending on an external debugging interface and not increasing significant hardware cost, so that effective monitoring of the working state of the motor controller is realized.

The invention relates to the technical field of automobile electronic control, and discloses an automobile exhaust system temperature prediction and protection control method based on modular modeling, which comprises the following steps: configuring an exhaust system modular model, collecting sensor data of an engine exhaust system in real time, and calculating the temperature of the engine exhaust system; calculating a temperature prediction value of each node of the exhaust system based on the modular model; a configurable exhaust system model is constructed by adopting a modular modeling method, exhaust systems of different structures are flexibly adapted, including turbocharging, natural air suction and various types with and without particle traps, and the universality and deployment efficiency of the model are improved; model calculation is driven based on real-time sensor data, dynamic prediction of the temperature of each node of the exhaust system is realized, the problem of insufficient prediction precision of a traditional single model is avoided, and a reliable basis is provided for subsequent protection control.

The invention relates to the technical field of automobile electronic intelligent fault diagnosis, and discloses a multi-modal data fusion automobile air conditioner controller abnormal state monitoring method, which comprises the following steps: deploying five types of intelligent sensor nodes at key positions of an automobile air conditioner system to realize hardware-level time synchronization and adaptive sampling; a fast ICA algorithm is combined with sliding window processing to realize signal separation, a self-adaptive wavelet basis selection mechanism is designed to carry out time-frequency analysis, and principal component analysis is used to carry out feature dimension reduction; constructing a lightweight attention fusion network, dynamically adjusting different modal feature weights, and mining feature relevance through a cross-modal interaction module; a hierarchical progressive anomaly detection architecture is designed, a statistical method and a neural network detection result are fused, a time consistency constraint mechanism is established, and multi-time scale anomaly prediction is realized; and fault type identification and severity evaluation are carried out in combination with an expert knowledge base, and a multi-priority protection strategy and an emergency plan are formulated.

The invention provides an electronic control unit upgrading method and device, electronic equipment, a chip and a medium, and relates to the technical field of automotive electronics. The upgrading method of the electronic control unit comprises the following steps: in response to an upgrading instruction, moving a boot-load upgrading file from a cache region to a first running region, and erasing the boot-load upgrading file in the cache region; in the first running area, flashing the boot-load upgrading file and activating a corresponding boot-load program; loading the application program upgrading file into the cache region, and moving the application program upgrading file from the cache region to a second running region based on the starting loading program; in the second running area, the application program upgrading file is flashed and written. Through the technical scheme provided by the invention, the problem that bootloader upgrade is not supported or the ECU is unstable in the upgrade of the ECU is solved, support is provided for the bootloader upgrade in the ECU, and the stability of the ECU is improved.

The invention relates to the technical field of automotive electronics, in particular to a vehicle panoramic image system based on multi-camera collaboration, which comprises a camera group used for acquiring local images of the surrounding environment of a vehicle in real time; the image processing module is used for receiving the local image and processing the local image in real time to generate a panoramic aerial view surrounding the vehicle; the display control module is used for receiving and outputting the panoramic aerial view to a vehicle-mounted display device for real-time display; the real-time communication connection between the image processing unit and the camera group ensures the real-time processing of image data, the display control module outputs the processed panoramic view to the vehicle-mounted display equipment in real time, and the cooperative work architecture effectively solves the problem of image splicing dislocation caused by camera parameter offset in the prior art. Possible camera installation deviation is compensated through real-time image processing, and continuity and accuracy of panoramic images are guaranteed.

The invention discloses a PTC ceramic material and a preparation method thereof, and relates to the technical field of PTC, and the PTC ceramic material is prepared from the following components: 50-65 parts of barium titanate, 12-16 parts of lead tetraoxide, 0.1-0.3 part of yttrium oxide, 0.1-0.3 part of lanthanum oxide, 6-15 parts of modified silicon boride, 4-10 parts of aluminum oxide, 1-3 parts of ammonium polyacrylate, and 3-6 parts of polyvinyl alcohol. Through synergistic cooperation of a barium titanate main body and functional fillers such as modified silicon boride, leap-type improvement of the comprehensive performance of the PTC ceramic material is realized, on the basis of maintaining excellent PTC characteristics, the heat conductivity coefficient and the breaking strength of the material are effectively improved, the thermal shock resistance and the mechanical reliability are remarkably enhanced, and the PTC ceramic material has good application prospects. The method is especially suitable for the high-end application fields of automotive electronics, industrial control, high-power LED driving and the like.

The invention belongs to the technical field of automobile electronic testing, and particularly relates to an intelligent OTA automatic testing method and system in a multi-dimensional environment, and the method comprises the steps: a testing management platform configures a testing scene and a testing case, schedules a testing task to a cloud server to simulate a real OTA cloud service, and cooperates with a multi-dimensional environment simulation cluster to construct a virtual testing environment; deploying a real vehicle test agent to execute a test case and collect real vehicle data, and utilizing a digital twin synchronization engine to realize bidirectional data synchronization of a simulation environment and a real vehicle environment; collecting heterogeneous data of each key node of the simulation environment and the real vehicle environment in real time, and uploading the collected heterogeneous data to the big data platform for storage; and based on heterogeneous data stored by the big data platform, intelligent analysis is performed by using an intelligent analysis and evaluation engine, and system closed-loop optimization is performed according to an analysis result.